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1. Heterogeneous nucleation measurements in a sheathed planar diffusive condensation particle counter

Author:
Derek Kuldinow; Alexis Przybylak; Yizhi Li; Luis J. Perez-Lorenzo; Derek Oberreit; Juan Fernandez de la Mora
Source:
Journal of colloid and interface science 2022 v.605 pp. 556-570
ISSN:
0021-9797
Subject:
aerosols; bromides; cations; clothing; colloids; condensers; counters; gases; journals; measurement; particles; prediction; probability; salting; temperature
Abstract:
... Hypothesis: While the lack of efficient tools yielding controllable uniform saturation ratios (S) has delayed basic experimental heterogeneous nucleation studies, common diffusive condensation particle counters (DCPCs) could fill this gap if their S-variation were minimized by increasing the proportion of sheath gas (σ) surrounding a central core of purified clusters.Analysis: We measure the activ ...
DOI:
10.1016/j.jcis.2021.07.049

2. Performance and economic analyses of a combined bioreactor for treating odors, volatile organic compounds, and aerosols from a landfill site

Author:
Jianwei Liu; Chen Lu; Lihua Huang; Jianbin Sun; Peng Yue; Xueli Liu; Xinyue Kang
Source:
Journal of cleaner production 2021 v.278 pp. 124161
ISSN:
0959-6526
Subject:
aeration; aerosols; ammonia; bacteria; biofiltration; bioreactors; chlorides; fungi; gases; hydrogen sulfide; ions; landfills; nitrates; nitrites; odors; operating costs; packaging materials; sulfates; volatile organic compounds; water solubility
Abstract:
... A full-scale combined bioreactor with a biological aeration zone (BAZ) and a biological filtration zone (BFZ) was adopted to treat odors, volatile organic compounds (VOCs), and aerosols emitted from a landfill site. The BAZ mainly relies on suspended microorganisms that degrade substances with high water solubility, while the BFZ is divided into an acidic biofiltration unit (ABU) and a neutral bio ...
DOI:
10.1016/j.jclepro.2020.124161

3. An experimental investigation into ignition and combustion of groups of slurry fuel droplets containing high concentrations of water

Author:
T.R. Valiullin; K.Yu. Vershinina; G.V. Kuznetsov; P.A. Strizhak
Source:
Fuel processing technology 2020 v.210 pp. 106553
ISSN:
0378-3820
Subject:
aerosols; combustion; databases; droplet size; droplets; evaporation; fuels; gases; liquids; oils; petrochemicals; slurries
Abstract:
... In this study, the main ignition and combustion characteristics have been compared for droplet groups of a coal-water slurry containing petrochemicals (CWSP), as well as oil, surrounded by water droplets. Thus, in a combustion chamber, we simulated the ignition and combustion conditions of a heterogeneous fuel aerosol that can be formed when jets of different liquids cross or when multi-component ...
DOI:
10.1016/j.fuproc.2020.106553

4. Approach to evaluate the gas/aerosol partition coefficient of organic volatile compounds using DFT methods associated with polarizable continuum models

Author:
Lillian L. de Castilho; Fernando Emanuel Bispo dos Santos; Leonardo Baptista
Source:
Atmospheric environment 2020 v.224 pp. 117363
ISSN:
1352-2310
Subject:
aerosols; air quality; atmospheric chemistry; gases; inorganic compounds; ionic strength; limonene; models; oxidation; pH; partition coefficients; solubility; solutes; solvation; solvents; volatile compounds
Abstract:
... Gas/aerosol partition coefficients are important to the development of air quality models that include the physical chemistry of atmospheric aerosols because they are related to the solubility of gases in water. This paper presents an approach to calculate these coefficients using DFT methods associated with polarizable continuum models to include the solvent effect. The methodology was tested by ...
DOI:
10.1016/j.atmosenv.2020.117363

5. Assessment of the seasonal cycle of nitrate in PM2.5 using chemical compositions and stable nitrogen and oxygen isotopes at Nanchang, China

Author:
Li Luo; Yuan-Yuan Pan; Ren-Guo Zhu; Zhong-Yi Zhang; Neng-Jian Zheng; Yong-Hui Liu; Cheng Liu; Hong-Wei Xiao; Hua-Yun Xiao
Source:
Atmospheric environment 2020 v.225 pp. 117371
ISSN:
1352-2310
Subject:
Bayesian theory; aerosols; air pollution; ammonium; atmospheric chemistry; autumn; chlorides; gases; liquids; mixing; nitrates; nitric acid; nitrogen; nitrogen dioxide; oxygen isotopes; particulates; seasonal variation; spring; statistical models; summer; volatile organic compounds; water content; water solubility; winter; China
Abstract:
... Nitrate (particulate NO3− and gas-phase HNO₃) are the primary acidic ions in the atmosphere and play important roles in regional air pollution. However, quantification of the formation pathways of atmospheric nitrate are still poorly understood. Samples of PM₂.₅ were collected at Nanchang, China, from September 2017 to August 2018. The concentrations of water-soluble ions and the stable isotopic c ...
DOI:
10.1016/j.atmosenv.2020.117371

6. Contribution of biogenic sources to secondary organic aerosol in the summertime in Shaanxi, China

Author:
Yong Xu; Yonggui Chen; Jingsi Gao; Shengqiang Zhu; Qi Ying; Jianlin Hu; Peng Wang; Liguo Feng; Haibin Kang; Dexiang Wang
Source:
Chemosphere 2020 v.254 pp. 126815
ISSN:
0045-6535
Subject:
aerosols; air quality; emissions; gases; isoprene; monoterpenoids; oligomerization; oxidation; summer; vegetation; volatile organic compounds; China
Abstract:
... A revised Community Multi-scale Air Quality (CMAQ) model with updated secondary organic aerosol (SOA) yields and a more detailed description of SOA formation from isoprene (ISOP) oxidation was applied to study the spatial distribution of SOA, its components and precursors in Shaanxi in July of 2013. The emissions of biogenic volatile organic compounds (BVOCs) were generated using the Model of Emis ...
DOI:
10.1016/j.chemosphere.2020.126815

7. Determination of reactions between Criegee intermediates and methanesulfonic acid at the air-water interface

Author:
Xiaohui Ma; Xianwei Zhao; Zixiao Huang; Junjie Wang; Guochun Lv; Fei Xu; Qingzhu Zhang; Wenxing Wang
Source:
Science of the total environment 2020 v.707 pp. 135804
ISSN:
0048-9697
Subject:
aerosols; free radicals; gases; hydroperoxides; hydroxyl radicals; liquid-air interface; molecular dynamics; nitrates; pollution control; reaction mechanisms; sulfates; sulfonic acids; troposphere
Abstract:
... In recent years, Criegee chemistry has become an important research focus due to its relevance in regulating concentrations of tropospheric OH radicals, hydroperoxides, sulfates, nitrates, and aerosols. However, to date, its interface behavior remains poorly understood. Thus, in this study, we used the Born-Oppenheimer molecular dynamics (BOMD) simulation method to explore the reaction mechanisms ...
DOI:
10.1016/j.scitotenv.2019.135804

8. Effects of NO₂ and SO₂ on the heterogeneous reaction of acetic acid on α-Al₂O₃ in the presence and absence of simulated irradiation

Author:
Ning Yang; Narcisse T. Tsona; Shumin Cheng; Yifeng Wang; Lingyan Wu; Maofa Ge; Lin Du
Source:
Environmental science 2020 v.22 no.2 pp. 408-417
ISSN:
2050-7895
Subject:
Fourier transform infrared spectroscopy; acetates; acetic acid; aerosols; aluminum oxide; gases; irradiation; nitrates; nitrogen dioxide; solar radiation; sulfates; sulfites; sulfur dioxide
Abstract:
... The effects of NO₂ and SO₂ on the atmospheric heterogeneous reaction of acetic acid on α-Al₂O₃ in the presence and absence of simulated irradiation were investigated at ambient conditions by using the diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) technique. The experiment was divided into two parts: the heterogeneous reaction experiment and the pre-adsorption reaction experi ...
DOI:
10.1039/c9em00550a

9. Evaluation of LIRIC Algorithm Performance Using Independent Sun-Sky Photometer Data at Two Altitude Levels

Author:
María J. Granados-Muñoz; José Antonio Benavent-Oltra; Daniel Pérez-Ramírez; Hassan Lyamani; Juan Luis Guerrero-Rascado; Juan Antonio Bravo-Aranda; Francisco Navas-Guzmán; Antonio Valenzuela; Francisco José Olmo; Lucas Alados-Arboledas
Source:
Remote Sensing 2020 v.12 no.5 pp. -
ISSN:
2072-4292
Subject:
aerosols; algorithms; altitude; databases; dust; gases; governmental programs and projects; infrastructure; lidar; photometers; remote sensing; robots; statistical analysis; summer; uncertainty
Abstract:
... This work evaluates the Lidar-Radiometer Inversion Code (LIRIC) using sun-sky photometers located at different altitudes in the same atmospheric column. Measurements were acquired during an intensive observational period in summer 2012 at Aerosols, Clouds, and Trace gases Research InfraStructure Network (ACTRIS)/Aerosol Robotic Network (AERONET) Granada (GRA; 37.16°N, 3.61°W, 680 m above sea level ...
DOI:
10.3390/rs12050842

10. Evaluation of the Oxidation Flow Reactor for particulate matter emission limit certification

Author:
Junji Cao; Qiyuan Wang; Li Li; Yue Zhang; Jie Tian; L.W. Antony Chen; Steven Sai Hang Ho; Xiaoliang Wang; Judith C. Chow; John G. Watson
Source:
Atmospheric environment 2020 v.224 pp. 117086
ISSN:
1352-2310
Subject:
aerosols; burning; certification; combustion; emissions factor; fuels; gases; models; particulate emissions; particulates; photochemistry; sulfur dioxide; surveys; ultraviolet radiation; uncertainty; volatilization; China
Abstract:
... As secondary aerosols become larger fractions of ambient PM₂.₅, emission factors and source profiles need to reflect the photochemical aging of multipollutant emissions that account for changes in transport between source and receptor. Oxidation Flow Reactors (OFR) intend to simulate gas/particle transformation and volatilization with time-scales of hours to days in order to estimate mass gains or ...
DOI:
10.1016/j.atmosenv.2019.117086

11. Fossil fuel-related emissions were the major source of NH3 pollution in urban cities of northern China in the autumn of 2017

Author:
Zhongyi Zhang; Yang Zeng; Nengjian Zheng; Li Luo; Hongwei Xiao; Huayun Xiao
Source:
Environmental pollution 2020 v.256 pp. 113428
ISSN:
0269-7491
Subject:
Bayesian theory; aerosols; air quality; ammonia; autumn; cities; coal; combustion; emissions; environmental health; fractionation; gases; particulates; pollution; satellites; statistical models; urban areas; China
Abstract:
... As the most important gas-phase alkaline species, atmospheric ammonia (NH3) contributes considerably to the formation and development of fine-mode particles (PM2.5), which affect air quality and environmental health. Recent satellite-based observations suggest that the North China Plain is the largest agricultural NH3 emission source in China. However, our isotopic approach shows that the surface ...
DOI:
10.1016/j.envpol.2019.113428

12. Hydroxyl radical-initiated aging of particulate squalane

Author:
Bowen Zhang; Xiaoyu Hu; Lei Yao; Mingyi Wang; Gan Yang; Yiqun Lu; Yiliang Liu; Lin Wang
Source:
Atmospheric environment 2020 v.237 pp. 117663
ISSN:
1352-2310
Subject:
Earth system science; aerosols; alcohols; alkanes; atmospheric chemistry; carbon; free radicals; gases; hydrogen; hydroxyl radicals; isomerization; oxygen; photooxidation; spectrometers
Abstract:
... Heterogeneous aging of organic aerosols can significantly alter their physicochemical properties and thus their impacts on the radiative balance of the earth system. In this study, kinetics and mechanisms of heterogeneous reactions between suspended squalane particles and hydroxyl (OH) radicals were investigated using a self-made photooxidation flow tube and a high-resolution long time-of-flight c ...
DOI:
10.1016/j.atmosenv.2020.117663

13. Modified regional biogenic VOC emissions with actual ozone stress and integrated land cover information: A case study in Yangtze River Delta, China

Author:
Yutong Wang; Yu Zhao; Lei Zhang; Jie Zhang; Yang Liu
Source:
Science of the total environment 2020 v.727 pp. 138703
ISSN:
0048-9697
Subject:
aerosols; air quality; case studies; data collection; deciduous forests; emissions; emissions factor; gases; growing season; land cover; meta-analysis; models; nitrogen oxides; ozone; river deltas; uncertainty; vegetation cover; volatile organic compounds; China; Yangtze River
Abstract:
... The biogenic volatile organic compounds (BVOCs) emissions are influenced by ambient ozone (O₃) concentrations and vegetation cover. In most studies, however, the interaction between O₃ and plants has not been considered and there are uncertainties in land cover input and emission factors (EFs) in BVOCs emission estimation, particularly at the regional scale. In this study, an O₃ exposure-isoprene ...
DOI:
10.1016/j.scitotenv.2020.138703

14. PM2.5-bound unresolved complex mixtures (UCM) in the Pearl River Delta region: Abundance, atmospheric processes and sources

Author:
Hua Fang; Scott D. Lowther; Ming Zhu; Chenglei Pei; Sheng Li; Zheng Fang; Xu Yu; Qingqing Yu; Yujun Wang; Yanli Zhang; Kevin C. Jones; Xinming Wang
Source:
Atmospheric environment 2020 v.226 pp. 117407
ISSN:
1352-2310
Subject:
aerosols; atmospheric chemistry; biomass burning; cities; coal; combustion; dust; gases; organic matter; particulates; river deltas; rivers; summer; tracer techniques; China
Abstract:
... Unresolved complex mixture (UCM) accounts for a substantial fraction of particulate organic matters and plays an important role in forming secondary organic aerosol (SOA), yet their abundance, sources and atmospheric processes are not well understood. In this study, filter-based ambient PM₂.₅ samples were collected concourrently at an urban site and a rural site in the Pearl River Delta (PRD) regi ...
DOI:
10.1016/j.atmosenv.2020.117407

15. Smog chamber study of the effects of NOx and NH3 on the formation of secondary organic aerosols and optical properties from photo-oxidation of toluene

Author:
Xue Qi; Shuping Zhu; Chenzhang Zhu; Jing Hu; Shengrong Lou; Li Xu; Junguo Dong; Ping Cheng
Source:
Science of the total environment 2020 v.727 pp. 138632
ISSN:
0048-9697
Subject:
aerosols; air quality; ammonia; ammonium nitrate; gases; human health; hydroxyl radicals; mass spectrometry; nitrogen oxides; optical properties; photooxidation; rapid methods; reaction mechanisms; smog pollution; toluene; China
Abstract:
... Secondary organic aerosols (SOAs) have been receiving significant attention because of their significant impacts on air quality and human health. In this study, the influences of nitrogen oxides (NOx) and ammonia (NH₃) on SOA formation from photooxidation of toluene was investigated in the Shanghai university smog chamber. The chemical and physical characteristics of gas-phase products and SOAs fr ...
DOI:
10.1016/j.scitotenv.2020.138632

16. The diurnal characteristics of PM-bound ROS and its influencing factors at urban ambient and roadside environments

Author:
Nirmal Kumar Gali; Svetlana Stevanovic; Peter Brimblecombe; Reece Alexander Brown; Zoran Ristovski; Zhi Ning
Source:
Atmospheric research 2020 v.244 pp. 105039
ISSN:
0169-8095
Subject:
aerosols; carbon; gases; particulates; polycyclic aromatic hydrocarbons; reactive oxygen species; roadsides; China
Abstract:
... The airborne particulate matter (PM) is known to cause adverse pulmonary and cardiovascular health effects. This study investigated the diurnal characteristics of PM induced PM-bound ROS from real time measurements in typical roadside and urban background sites in Hong Kong, and identified potential influencing factors to its variation in atmosphere. A nitroxide probe (BPEAnit) was employed in the ...
DOI:
10.1016/j.atmosres.2020.105039

17. Aerosol Phase State and Its Link to Chemical Composition and Liquid Water Content in a Subtropical Coastal Megacity

Author:
Yuechen Liu; Zhijun Wu; Xiaofeng Huang; Hangyin Shen; Yao Bai; Kai Qiao; Xiangxinyue Meng; Weiwei Hu; Mingjin Tang; Lingyan He
Source:
Environmental science & technology 2019 v.53 no.9 pp. 5027-5033
ISSN:
1520-5851
Subject:
aerosols; cities; developing countries; emissions; gases; liquids; mass transfer; mixing; nitrogen oxides; organic matter; relative humidity; spring; sulfur dioxide; urban areas; water content; China
Abstract:
... Particle phase state plays a key role in gas-particle partitioning, heterogeneous and multiphase reactions, and secondary aerosol formation. In this work, the rebound fraction and chemical composition of submicron particles were simultaneously measured to investigate the particle phase state and its link to chemical composition in a subtropical coastal urban city (Shenzhen, China). Submicron parti ...
DOI:
10.1021/acs.est.9b01196

18. Aerosol and pollutant characteristics in Delhi during a winter research campaign

Author:
Umesh C. Dumka; Suresh Tiwari; Dimitris G. Kaskaoutis; Vijay K. Soni; Promod D. Safai; Shiv D. Attri
Source:
Environmental science and pollution research international 2019 v.26 no.4 pp. 3771-3794
ISSN:
0944-1344
Subject:
absorbance; absorption; aerosols; air pollutants; air pollution; carbon; carbon monoxide; developing countries; gases; meteorology; nitric oxide; ozone; particulates; probability; urban areas; wind speed; winter; India
Abstract:
... Urban areas in developing countries are major sources of carbonaceous aerosols and air pollutants, pointing out the need for a detailed assessment of their levels and origin close to the source. A multi-instrument research campaign was performed in Delhi during December 2015–February 2016 aimed at exploring the pollution levels and the contribution of various sources to particulate matter (PM) con ...
DOI:
10.1007/s11356-018-3885-y

19. Aerosols and carbonaceous and nitrogenous compounds emitted during the combustion of dead shrubs according to twigs’ diameter and combustion phases

Author:
T. Barboni; L. Leonelli; P.-A. Santoni; V. Tihay-Felicelli
Source:
Fire safety journal 2020 v.113 pp. 102988
ISSN:
0379-7112
Subject:
Cistus monspeliensis; Fourier transform infrared spectroscopy; aerosols; automation; burning; calorimeters; carbon; carbon dioxide; carbon monoxide; chemical composition; combustion; combustion efficiency; forest fires; fuels; gas chromatography-mass spectrometry; gases; lung function; methane; nitric oxide; nitrogen compounds; shrubs; smoke
Abstract:
... Smoke from forest fires is hazardous to health and can result in losses of respiratory function and vision. The knowledge of the chemical constituents in such smoke is an important objective. In this study, leaves and branches and twigs of Cistus Monspeliensis were burned with a cone calorimeter and the emitted smoke was analysed by non-dispersive infrared (NDIR) spectroscopy, He–Ne laser method, ...
DOI:
10.1016/j.firesaf.2020.102988

20. Alterations in the surface properties of sea spray aerosols introduced by the presence of sterols

Author:
Shumin Cheng; Siyang Li; Narcisse T. Tsona; Christian George; Lin Du
Source:
Science of the total environment 2019 v.671 pp. 1161-1169
ISSN:
0048-9697
Subject:
aerosols; chemical bonding; cholesterol; ergosterol; gases; mixing; spectroscopy; stearic acid; stigmasterol
Abstract:
... The mixed stearic acid (SA)/sterol systems were used as sea spray aerosol mimics to get more insights into the alterations in surface properties of aerosols induced by sterols. By means of surface pressure (π)–area (A) isotherms and polarization modulation-infrared reflection absorption spectroscopy (PM-IRRAS), the effect of cholesterol (chol), stigmasterol (stig) and ergosterol (erg) on the later ...
DOI:
10.1016/j.scitotenv.2019.03.433

21. Challenges for In-Flight Calibration of Thermal Infrared Instruments for Earth Observation

Author:
David Smith; Daniel Peters; Timothy Nightingale; Jonathan Pearce; Radka Veltcheva
Source:
Remote Sensing 2020 v.12 no.11 pp. -
ISSN:
2072-4292
Subject:
aerosols; calibration; coatings; electronics; gases; land classification; phase transition; platinum; radiometry; reference standards; remote sensing; satellites; soil composition; surface temperature; thermometers; traceability; uncertainty; wavelengths
Abstract:
... Satellite instruments operating in the thermal infrared wavelength range >3 µm provide information for applications such as land surface temperature (LST), sea surface temperatures (SST), land surface emissivity, land classification, soil composition, volcanology, fire radiative power, cloud masking, aerosols, and trace gases. All these instruments are dependent on blackbody (BB) calibration sourc ...
DOI:
10.3390/rs12111832

22. Characteristics and secondary formation of water-soluble organic acids in PM1, PM2.5 and PM10 in Beijing during haze episodes

Author:
Qing Yu; Jing Chen; Weihua Qin; Siming Cheng; Yuepeng Zhang; Mushtaq Ahmad; Wei Ouyang
Source:
Science of the total environment 2019 v.669 pp. 175-184
ISSN:
0048-9697
Subject:
aerosols; diurnal variation; gases; nitrates; oxidation; particulates; photochemistry; phthalic acid; pollution; regression analysis; spring; sulfates; water solubility; winter; China
Abstract:
... Water-soluble organic acids are widely involved in various atmospheric physicochemical processes and appear as an important fraction of atmospheric aerosols. Nineteen water-soluble organic acids in 12-h PM1, PM2.5 and PM10 samples collected in urban Beijing during haze episodes in winter and spring of 2017 were identified to investigate their characteristics and secondary formation mechanism. The ...
DOI:
10.1016/j.scitotenv.2019.03.131

23. Characterization of organic aerosols and their precursors in southern China during a severe haze episode in January 2017

Author:
Di Chang; Zhe Wang; Jia Guo; Tao Li; Yiheng Liang; Lingyan Kang; Men Xia; Yaru Wang; Chuan Yu; Hui Yun; Dingli Yue; Tao Wang
Source:
Science of the total environment 2019 v.691 pp. 101-111
ISSN:
0048-9697
Subject:
aerosols; air pollution; aldehydes; butanes; emissions; gases; industrialization; ketones; organic carbon; oxalic acid; oxidation; particulates; photochemistry; propane; river deltas; rivers; toluene; volatile organic compounds; water solubility; xylene; China
Abstract:
... The rapid industrialization and economic development in the Pearl River Delta (PRD) region of southern China have led to a substantial increase in anthropogenic emissions and hence frequent haze pollution over the past two decades. In early January 2017, a severe regional haze pollution episode was captured in the PRD region, with a peak PM₂.₅ concentration of around 400μgm⁻³, the highest value ev ...
DOI:
10.1016/j.scitotenv.2019.07.123

24. Characterization of submicron aerosol chemical composition and sources in the coastal area of Central Chile

Author:
S. Saarikoski; F. Reyes; Y. Vázquez; M. Tagle; H. Timonen; M. Aurela; S. Carbone; D.R. Worsnop; R. Hillamo; P. Oyola
Source:
Atmospheric environment 2019 v.199 pp. 391-401
ISSN:
1352-2310
Subject:
absorption; aerosols; ammonium; anthropogenic activities; atmospheric chemistry; biomass; burning; cadmium; carbon; chemical composition; coasts; copper; dimethyl sulfide; gases; iron; magnesium; marine environment; nitrates; oxidation; photometers; physicochemical properties; potassium; sodium; soot; spectrometers; sulfates; sulfur dioxide; vanadium; zinc; Chile
Abstract:
... Chemical characteristics and the sources of submicron particles (<1 μm in diameter) were investigated in Valle Alegre, the coastal area of Central Chile. The chemical composition of particles was studied by using a Soot particle Aerosol Mass Spectrometer and Multi-Angle Absorption Photometer. Submicron particles were dominated by organics (42% of mass) and sulfate (39% of mass) while the mass frac ...
DOI:
10.1016/j.atmosenv.2018.11.040

25. Chemical Characterization of Highly Functionalized Organonitrates Contributing to Night-Time Organic Aerosol Mass Loadings and Particle Growth

Author:
Wei Huang; Harald Saathoff; Xiaoli Shen; Ramakrishna Ramisetty; Thomas Leisner; Claudia Mohr
Source:
Environmental science & technology 2019 v.53 no.3 pp. 1165-1174
ISSN:
1520-5851
Subject:
aerosols; carbon; chemical composition; emissions; free radicals; gases; ionization; nitrates; nitrogen oxides; oxidation; oxygen; rural areas; spectrometers; volatile organic compounds; Germany
Abstract:
... Reactions of volatile organic compounds (VOC) with NO₃ radicals and of reactive intermediates of oxidized VOC with NOₓ can lead to the formation of highly functionalized organonitrates (ON). We present quantitative and chemical information on ON contributing to high night-time organic aerosol (OA) mass concentrations measured during July–August 2016 in a rural area in southwest Germany. A filter i ...
DOI:
10.1021/acs.est.8b05826

26. Chemical content and source apportionment of 36 heavy metal analysis and health risk assessment in aerosol of Beijing

Author:
Limeng Cui; Zhuona Wu; Peng Han; Yasuyuki Taira; Huan Wang; Qinghua Meng; Zechen Feng; Shuguang Zhai; Jun Yu; Weijie Zhu; Yuxia Kong; Hongfang Wang; Hong Zhang; Bin Bai; Yun Lou; Yongzhong Ma
Source:
Environmental science and pollution research international 2020 v.27 no.7 pp. 7005-7014
ISSN:
0944-1344
Subject:
adults; aerosols; air pollutants; air pollution; air quality; aluminum; anthropogenic activities; antimony; arsenic; barium; breathing; cadmium; calcium; cesium; children; chromium; cobalt; copper; emissions; gases; health effects assessments; heavy metals; inhalation exposure; iron; lead; magnesium; manganese; mercury; molybdenum; nickel; potassium; radioactivity; rubidium; silver; sodium; spring; strontium; tin; zinc; China
Abstract:
... The concentration levels of 36 airborne heavy metals and atmospheric radioactivity in total suspended particulate (TSP) samples were measured to investigate the chemical characteristics, potential sources of aerosols, and health risk in Beijing, China, from September 2016 to September 2017. The TSP concentrations varied from 6.93 to 469.18 μg/m³, with a median of 133.97 μg/m³. The order for the me ...
DOI:
10.1007/s11356-019-06427-w

27. Chemical processing of water-soluble species and formation of secondary organic aerosol in fogs

Author:
Hwajin Kim; Sonya Collier; Xinlei Ge; Jianzhong Xu; Yele Sun; Wenqing Jiang; Youliang Wang; Pierre Herckes; Qi Zhang
Source:
Atmospheric environment 2019 v.200 pp. 158-166
ISSN:
1352-2310
Subject:
aerosols; air quality; aldehydes; amino compounds; ammonium; climate; droplets; gases; human health; ion exchange chromatography; moieties; nitrates; processing chemistry; solutes; spectrometers; sulfates; total organic carbon; water solubility; winter; California
Abstract:
... A field study on fog chemistry and aqueous-phase processing of aerosol particles was conducted in Fresno, California's San Joaquin Valley (SJV) during wintertime. Fog droplets were collected while interstitial submicron aerosol was characterized in real time using a High Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-AMS). The fog samples were later analyzed using HR-AMS, ion chromatograp ...
DOI:
10.1016/j.atmosenv.2018.11.062

28. Chemistry-triggered events of PM2.5 explosive growth during late autumn and winter in Shanghai, China

Author:
Wenwen Sun; Dongfang Wang; Lan Yao; Hongbo Fu; Qingyan Fu; Hongli Wang; Qing Li; Lin Wang; Xin Yang; Aiyong Xian; Gehui Wang; Hang Xiao; Jianmin Chen
Source:
Environmental pollution 2019 v.254 pp. 112864
ISSN:
0269-7491
Subject:
aerosols; air pollution control; ammonium; autumn; biomass burning; gases; inorganic ions; nitrates; organic carbon; oxidation; particulate emissions; particulates; pollutants; relative humidity; sulfates; wind speed; winter; China
Abstract:
... To better understand the mechanism of PM₂.₅ explosive growth (EG), we conducted concurrent measurements of gaseous pollutants, PM₂.₅ and its chemical composition (inorganic ions, organic carbon, and element carbon) with a time resolution of 1 h in Shanghai in late autumn and winter from 2014 to 2017. In this study, the EG events, which are defined as the net increase in the mass concentration of P ...
DOI:
10.1016/j.envpol.2019.07.032

29. Climate-driven trends of biogenic volatile organic compound emissions and their impacts on summertime ozone and secondary organic aerosol in China in the 2050s

Author:
Song Liu; Jia Xing; Hongliang Zhang; Dian Ding; Fenfen Zhang; Bin Zhao; Shovan Kumar Sahu; Shuxiao Wang
Source:
Atmospheric environment 2019 v.218 pp. 117020
ISSN:
1352-2310
Subject:
aerosols; air pollution control; air quality; atmospheric chemistry; climate; climate change; emissions; gases; isoprene; monoterpenoids; ozone; summer; surface temperature; volatile organic compounds; weather research and forecasting model; China
Abstract:
... As a precursor of ozone (O₃) and secondary organic aerosol (SOA), volatile organic compounds (VOCs) largely derive from natural sources, which may vary with future climate change patterns. In this study, the emissions and impacts of biogenic VOCs (BVOCs) were projected into summertime of the 2050s (average for 2048–2052) for China using the Model of Emissions of Gases and Aerosols from Nature (MEG ...
DOI:
10.1016/j.atmosenv.2019.117020

30. Continental outflow of anthropogenic aerosols over Arabian Sea and Indian Ocean during wintertime: ICARB-2018 campaign

Author:
A.R. Aswini; Prashant Hegde; S. Aryasree; Imran A. Girach; Prabha R. Nair
Source:
Science of the total environment 2020 v.712 pp. 135214
ISSN:
0048-9697
Subject:
aerosols; ammonium; chemical analysis; copper; gases; inorganic ions; lead; manganese; organic carbon; pollutants; pollution; spatial variation; water solubility; winter; zinc; Arabian Sea; Bay of Bengal; Indian Ocean; Indo-Gangetic Plain
Abstract:
... Chemical characterisation of atmospheric aerosols over Arabian Sea (AS) and Indian Ocean (IO) have been carried out during the winter period (January to February 2018) as part of the Integrated Campaign for Aerosols, gases and Radiation Budget (ICARB-2018). Mass concentrations of organic carbon (OC), elemental carbon (EC), water soluble and insoluble OC (WSOC, WIOC), primary and secondary OC (POC, ...
DOI:
10.1016/j.scitotenv.2019.135214

31. Determination of the amine-catalyzed SO3 hydrolysis mechanism in the gas phase and at the air-water interface

Author:
Xiaohui Ma; Xianwei Zhao; Zhezheng Ding; Wei Wang; Yuanyuan Wei; Fei Xu; Qingzhu Zhang; Wenxing Wang
Source:
Chemosphere 2020 v.252 pp. 126292
ISSN:
0045-6535
Subject:
aerosols; amines; ammonium; ammonium bisulfate; catalytic activity; gases; hydrogen bonding; hydrolysis; liquid-air interface; protons; sulfates; sulfuric acid
Abstract:
... New particle formation (NPF) involving amines in the atmosphere is considered an aggregation process, during which stable molecular clusters are formed from amines and sulfuric acid via hydrogen bond interaction. In this work, ab initio dynamics simulations of ammonium bisulfate formation from a series of amines, SO₃, and H₂O molecules were carried out in the gas phase and at the air-water interfa ...
DOI:
10.1016/j.chemosphere.2020.126292

32. Dynamics and mechanisms of volatile organic compound exchanges in a winter wheat field

Author:
A. Bachy; M. Aubinet; C. Amelynck; N. Schoon; B. Bodson; P. Delaplace; A. De Ligne; A. Digrado; P. du Jardin; M.-L. Fauconnier; A. Mozaffar; J.-F. Müller; B. Heinesch
Source:
Atmospheric environment 2020 v.221 pp. 117105
ISSN:
1352-2310
Subject:
acetaldehyde; acetic acid; acetone; aerosols; crops; developmental stages; eddy covariance; emissions; emissions factor; gases; grasses; growing season; leaves; methanol; mixing ratio; models; soil; spectrometers; volatile organic compounds; winter wheat; Belgium
Abstract:
... The understanding of biogenic volatile organic compound (BVOC) exchanges has become a key scientific issue because of their high reactivity and their impact in the atmosphere. However, so far, few studies have focused on BVOCs exchanged by agricultural species, and in particular by winter wheat, despite this species being the leading worldwide crop in terms of harvested area. This study for the fi ...
DOI:
10.1016/j.atmosenv.2019.117105

33. Effect of hydrogen concentration on graphene synthesis using microwave-driven plasma-mediated methane cracking

Author:
Madhu Singh; Arupananda Sengupta; Kurt Zeller; George Skoptsov; Randy L. Vander Wal
Source:
Carbon 2019 v.143 pp. 802-813
ISSN:
0008-6223
Subject:
Raman spectroscopy; X-ray diffraction; aerosols; cracking; energy; feedstocks; gases; graphene; hydrogen; methane; nanomaterials; thermogravimetry; transmission electron microscopy
Abstract:
... Gas phase graphene forms as an aerosol in a microwave plasma among other carbon forms. Consisting of 2–6 sheets per stack with dimensions between 100 and 500 nm, it is referred to as nanographene (NG). Surprisingly, increasing H/C ratio in the feedstock increases the relative graphitic content of the product. Dependence of the different carbon forms upon H/C ratio of the gas feed mixture is shown ...
DOI:
10.1016/j.carbon.2018.11.082

34. Effects of NH3 and alkaline metals on the formation of particulate sulfate and nitrate in wintertime Beijing

Author:
Ru-Jin Huang; Jing Duan; Yongjie Li; Qi Chen; Yang Chen; Mingjin Tang; Lu Yang; Haiyan Ni; Chunshui Lin; Wei Xu; Ying Liu; Chunying Chen; Zhen Yan; Jurgita Ovadnevaite; Darius Ceburnis; Uli Dusek; Junji Cao; Thorsten Hoffmann; Colin D. O'Dowd
Source:
Science of the total environment 2020 v.717 pp. 137190
ISSN:
0048-9697
Subject:
acidity; aerosols; air quality; ammonia; ammonium; calcium; cities; dust; dust storms; gases; magnesium; metal ions; neutralization; nitrates; nitric acid; nitrogen; oxidation; pH; potassium; sodium; sulfates; sulfur; sulfuric acid; thermodynamic models; winter; China
Abstract:
... Sulfate and nitrate from secondary reactions remain as the most abundant inorganic species in atmospheric particle matter (PM). Their formation is initiated by oxidation (either in gas phase or particle phase), followed by neutralization reaction primarily by NH₃, or by other alkaline species such as alkaline metal ions if available. The different roles of NH₃ and metal ions in neutralizing H₂SO₄ ...
DOI:
10.1016/j.scitotenv.2020.137190

35. Enhancement of dry deposition of PM2.5 nitrate in a cool-temperate forest

Author:
Akiyoshi Nakahara; Kentaro Takagi; Atsuyuki Sorimachi; Genki Katata; Kazuhide Matsuda
Source:
Atmospheric environment 2019 v.212 pp. 136-141
ISSN:
1352-2310
Subject:
aerosols; air pollutants; air pollution; air temperature; ammonium nitrate; atmospheric chemistry; canopy; dry deposition; forests; gases; models; nitric acid; nitrogen; particulates; sulfates; surface temperature; thermodynamics; volatilization; Japan
Abstract:
... Fine particulate matter (PM2.5) is one of most concerning air pollutants in East Asia. In order to further understand the dry deposition process of PM2.5, measurements were carried out in a cool-temperate forest located in a remote area of northern Japan. These measurements took into account the improvement of simulations by chemical transport models in this region. We measured the vertical profil ...
DOI:
10.1016/j.atmosenv.2019.05.053

36. European decision support modelling of long-term external doses received in inhabited areas contaminated by a nuclear power plant accident – 2: Post deposition contaminant mobility on outdoor surfaces

Author:
Yvonne Hinrichsen; Kasper G. Andersson
Source:
Journal of environmental radioactivity 2019 v.204 pp. 154-162
ISSN:
0265-931X
Subject:
accidents; aerosols; data collection; gases; models; nuclear power; power plants; radioactivity
Abstract:
... To enable estimation of time-integrated external doses to persons staying in an inhabited area radioactively contaminated by aerosols and gases released in connection with a large nuclear power plant accident, additional knowledge to that described in the first part of this paper is needed on the post-deposition migration of different types of contaminants on the various relevant types of environm ...
DOI:
10.1016/j.jenvrad.2019.04.009

37. Evolution of aerosol chemistry in Xi'an during the spring dust storm periods: Implications for heterogeneous formation of secondary organic aerosols on the dust surface

Author:
Yan Qin Ren; Ge Hui Wang; Jian Jun Li; Can Wu; Cong Cao; Jin Li; Jia Yuan Wang; Shuang Shuang Ge; Yu Ning Xie; Xing Ru Li; Fan Meng; Hong Li
Source:
Chemosphere 2019 v.215 pp. 413-421
ISSN:
0045-6535
Subject:
adsorption; aerosols; alkanes; bisphenol A; dust; dust storms; fatty acids; gases; hydrophilicity; mirabilite; molecular weight; oxidation; phenanthrenes; phthalates; soil; spring; volatilization; China
Abstract:
... TSP and 9-stage size-segregated samples were simultaneously collected in Xi'an during the spring of 2013 and analyzed for organic aerosols (OA) on a molecular level. n-Alkanes were the dominant compound class during the whole campaign, followed by fatty acids. High molecular weight (HMW) n-alkanes and fatty acids dominated in the coarse mode particles (>1.1 μm) during the dust event, indicating th ...
DOI:
10.1016/j.chemosphere.2018.10.064

38. Global vertically resolved aerosol direct radiation effect from three years of CALIOP data using the FORTH radiation transfer model

Author:
M.B. Korras-Carraca; V. Pappas; N. Hatzianastassiou; I. Vardavas; C. Matsoukas
Source:
Atmospheric research 2019 v.224 pp. 138-156
ISSN:
0169-8095
Subject:
absorption; aerosols; biomass; burning; cooling; deserts; dust; gases; models; optical properties; pollution; shortwave radiation; solar radiation
Abstract:
... We use global aerosol optical depth data from CALIOP with a radiation transfer model to investigate the aerosol direct radiative effect (DRE) and its sensitivity to the aerosol vertical resolution. Our study spans three years (2007–2009) and uses cloud data from ISCCP D2 to take into account cloud-aerosol radiative interactions on a monthly 2.5° × 2.5° resolution. The three-year global average all ...
DOI:
10.1016/j.atmosres.2019.03.024

39. Heterogeneous photochemistry of dicarboxylic acids on mineral dust

Author:
Milena Ponczek; Nathalie Hayeck; Corinne Emmelin; Christian George
Source:
Atmospheric environment 2019 v.212 pp. 262-271
ISSN:
1352-2310
Subject:
aerosols; aldehydes; atmospheric chemistry; carbon; dicarboxylic acids; dust; gases; high performance liquid chromatography; ice nucleation; ionization; irradiation; photocatalysis; photooxidation; reaction mechanisms; spectrometers; ultra-performance liquid chromatography; ultraviolet radiation; Arizona
Abstract:
... Dicarboxylic acids have low volatilities and hence are present mostly in the particulate phase, including the surface of dust particles. Mineral dust, globally the most emitted aerosol, has photocatalytic properties that can initiate photo-induced heterogeneous chemistry of organic compounds, which is still poorly characterized. We investigated the photochemistry of five dicarboxylic acids (DCA) i ...
DOI:
10.1016/j.atmosenv.2019.05.032

40. Highly Oxygenated Organic Molecules (HOM) from Gas-Phase Autoxidation Involving Peroxy Radicals: A Key Contributor to Atmospheric Aerosol

Author:
Federico Bianchi; Theo Kurtén; Matthieu Riva; Claudia Mohr; Matti P. Rissanen; Pontus Roldin; Torsten Berndt; John D. Crounse; Paul O. Wennberg; Thomas F. Mentel; Jürgen Wildt; Heikki Junninen; Tuija Jokinen; Markku Kulmala; Douglas R. Worsnop; Joel A. Thornton; Neil Donahue; Henrik G. Kjaergaard; Mikael Ehn
Source:
Chemical reviews 2019 v.119 no.6 pp. 3472-3509
ISSN:
1520-6890
Subject:
aerosols; autoxidation; free radicals; gases; physicochemical properties; volatile organic compounds
Abstract:
... Highly oxygenated organic molecules (HOM) are formed in the atmosphere via autoxidation involving peroxy radicals arising from volatile organic compounds (VOC). HOM condense on pre-existing particles and can be involved in new particle formation. HOM thus contribute to the formation of secondary organic aerosol (SOA), a significant and ubiquitous component of atmospheric aerosol known to affect th ...
DOI:
10.1021/acs.chemrev.8b00395
PubMed:
30799608
PubMed Central:
PMC6439441

41. Increasing the maturity of measurements of essential climate variables (ECVs) at Italian atmospheric WMO/GAW observatories by implementing automated data elaboration chains

Author:
Luca Naitza; Paolo Cristofanelli; Angela Marinoni; Francescopiero Calzolari; Fabrizio Roccato; Maurizio Busetto; Damiano Sferlazzo; Eleonora Aruffo; Piero Di Carlo; Mariantonia Bencardino; Francesco D’Amore; Francesca Sprovieri; Nicola Pirrone; Federico Dallo; Jacopo Gabrieli; Massimiliano Vardè; Giorgio Resci; Carlo Barbante; Paolo Bonasoni; Davide Putero
Source:
Computers & geosciences 2020 v.137 pp. 104432
ISSN:
0098-3004
Subject:
aerosols; automation; climatic factors; computers; gases; greenhouse gases; information processing; meteorological data; meteorological parameters; stakeholders; traceability; Italy
Abstract:
... In the framework of the National Project of Interest NextData, we developed automatic procedures for the flagging and formatting of trace gases, atmospheric aerosols and meteorological data to be submitted to the World Data Centers (WDCs) of the Global Atmosphere Watch program of the World Meteorological Organization (WMO/GAW). In particular, the atmospheric Essential Climate Variables (ECVs) cove ...
DOI:
10.1016/j.cageo.2020.104432

42. Inferring Aerosol Sources from Low-Cost Air Quality Sensor Measurements: A Case Study in Delhi, India

Author:
David H. Hagan; Shahzad Gani; Sahil Bhandari; Kanan Patel; Gazala Habib; Joshua S. Apte; Lea Hildebrandt Ruiz; Jesse H. Kroll
Source:
Environmental science & technology letters 2019 v.6 no.8 pp. 467-472
ISSN:
2328-8930
Subject:
aerosols; air quality; algorithms; calibration; case studies; combustion; exposure assessment; factor analysis; gases; monitoring; particulates; pollution; urban areas; winter; India
Abstract:
... Low-cost sensors (LCS) offer the opportunity to measure urban air quality at a spatiotemporal scale that is finer than what is currently practical with expensive research- or regulatory-grade instruments. Recently, the LCS research community has focused largely on sensor calibration, pollution monitoring, and exposure assessment; here, we investigate the applicability of LCS for characterizing par ...
DOI:
10.1021/acs.estlett.9b00393

43. Insight into the formation and evolution of secondary organic aerosol in the megacity of Beijing, China

Author:
Jiayun Li; Zirui Liu; Wenkang Gao; Guiqian Tang; Bo Hu; Zhiqiang Ma; Yuesi Wang
Source:
Atmospheric environment 2020 v.220 pp. 117070
ISSN:
1352-2310
Subject:
aerosols; ammonium; atmospheric chemistry; carbon; chlorides; cities; gases; nitrates; nitrogen dioxide; oxidation; oxygen; ozone; photochemistry; physicochemical properties; pollution; spectrometers; sulfates; water content; China
Abstract:
... Organic components are the most abundant fraction of atmospheric submicron particles, but the chemical characteristics of organic aerosols (OA) remain not fully understood. Here, the formation and evolution of secondary organic aerosol (SOA) was evaluated using an Aerodyne high-resolution time-of-flight aerosol mass spectrometer at an urban site in Beijing from 1 to 30 September 2015. The submicro ...
DOI:
10.1016/j.atmosenv.2019.117070

44. Levoglucosan as a tracer of biomass burning: Recent progress and perspectives

Author:
Hemraj Bhattarai; Eri Saikawa; Xin Wan; Hongxia Zhu; Kirpa Ram; Shaopeng Gao; Shichang Kang; Qianggong Zhang; Yulan Zhang; Guangming Wu; Xiaoping Wang; Kimitaka Kawamura; Pingqing Fu; Zhiyuan Cong
Source:
Atmospheric research 2019 v.220 pp. 20-33
ISSN:
0169-8095
Subject:
aerosols; air pollution; air quality; altitude; analytical methods; biomass; burning; cellulose; climate; emissions; forests; gases; hemicellulose; human health; ice; organic carbon; pyrolysis; sediments; snow
Abstract:
... Biomass burning (BB) is a major source of air pollution from local to global scale, having variable effects on air quality, human health, and climate system. Therefore, the source identification and characterization of BB-derived aerosols and tracer gases in the ambient environment is crucial. This review provides recent updates on the applicability of levoglucosan as a BB tracer in different envi ...
DOI:
10.1016/j.atmosres.2019.01.004

45. Lung cell exposure to secondary photochemical aerosols generated from OH oxidation of cyclic siloxanes

Author:
Benjamin M. King; Nathan J. Janechek; Nathan Bryngelson; Andrea Adamcakova-Dodd; Traci Lersch; Kristin Bunker; Gary Casuccio; Peter S. Thorne; Charles O. Stanier; Jennifer Fiegel
Source:
Chemosphere 2020 v.241 pp. 125126
ISSN:
0045-6535
Subject:
acute toxicity; aerosols; chemical composition; gases; liquid-air interface; lungs; oxygen; ozone; photooxidation; silicon; siloxanes
Abstract:
... To study the fate of cyclic volatile methyl siloxanes (cVMS) undergoing photooxidation in the environment and to assess the acute toxicity of inhaled secondary aerosols from cVMS, we used an oxidative flow reactor (OFR) to produce aerosols from oxidation of decamethylcyclopentasiloxane (D5). The aerosols produced from this process were characterized for size, shape, and chemical composition. We fo ...
DOI:
10.1016/j.chemosphere.2019.125126
PubMed:
31683444
PubMed Central:
PMC6941482

46. Microscopic mechanism of the interaction between water and formic acid-sodium chloride aerosol

Author:
Chao Zhang; Yueshe Wang; Haijun Wang; Yang Yang; Chenpei Li
Source:
Powder technology 2019 v.344 pp. 46-57
ISSN:
0032-5910
Subject:
aerosols; formic acid; gases; humidity; hydrogen; hygroscopicity; ingredients; molecular dynamics; powders; sodium chloride; temperature; water content
Abstract:
... As the effect of aerosol on the atmosphere is related to its hygroscopic properties, it is desirable to know the microscopic mechanism for the interaction between water and the aerosol consisting of inorganic and organic ingredients. In this work, molecular dynamics method is employed to investigate the behavior of formic acid - water systems without or with sodium chloride (NaCl), which represent ...
DOI:
10.1016/j.powtec.2018.11.105

47. Mid-latitude convective boundary-layer electricity: A study by large-eddy simulation

Author:
S.V. Anisimov; S.V. Galichenko; A.A. Prokhorchuk; K.V. Aphinogenov
Source:
Atmospheric research 2020 v.244 pp. 105035
ISSN:
0169-8095
Subject:
Earth atmosphere; aerosols; altitude; electricity; gases; heat transfer; ions; latitude; simulation models; wind speed
Abstract:
... This paper reports the first investigations of the mid-latitude convective boundary layer (CBL) electricity above the homogeneous land surface using a large-eddy simulation (LES). Our approach uses LES together with a subgrid kinematic model for relative dispersion of scalar to calculate Lagrangian trajectories of notional particles carrying radioactive nuclei, small atmospheric ions, and charged ...
DOI:
10.1016/j.atmosres.2020.105035

48. Minimizing secondary pollutant formation through identification of most influential volatile emissions in gasoline exhausts: Impact of the vehicle powertrain technology

Author:
Kawsar Mehsein; Caroline Norsic; Christophe Chaillou; André Nicolle
Source:
Atmospheric environment 2020 v.226 pp. 117394
ISSN:
1352-2310
Subject:
aerosols; atmospheric chemistry; batteries; emissions; formaldehyde; gases; gasoline; methane; methane production; nitrogen oxides; ozone; photochemistry; secondary pollutants; vehicles (equipment)
Abstract:
... Despite the growing share of hybrid vehicles in worldwide vehicle fleet, the impact of battery/engine switch on secondary pollutant precursors formation remains poorly understood. We herein identify the species to be removed primarily from the exhaust of hybrid vehicles to minimize secondary pollutants formation. Pollutants from a conventional (thermal) and a hybrid vehicle are herein evaluated in ...
DOI:
10.1016/j.atmosenv.2020.117394

49. Natural and anthropogenic contributions to long-term variations of SO2, NO2, CO, and AOD over East China

Author:
Hanqing Kang; Bin Zhu; Ronald J. van der A; Chunmao Zhu; Gerrit de Leeuw; Xuewei Hou; Jinhui Gao
Source:
Atmospheric research 2019 v.215 pp. 284-293
ISSN:
0169-8095
Subject:
aerosols; anthropogenic activities; carbon monoxide; emissions; energy; gases; humans; issues and policy; nitrogen dioxide; pollutants; sulfur dioxide; temporal variation; time series analysis; China
Abstract:
... Concentrations of atmospheric pollutants over East China have varied considerably during the past decades. These variations are partly due to variations of human activities, e.g., increasing energy consumption and implementation of government emission control policies, and partly to natural fluctuations. This study aims to separate the effects of natural processes and anthropogenic activities on t ...
DOI:
10.1016/j.atmosres.2018.09.012

50. Nitrated phenols and the phenolic precursors in the atmosphere in urban Jinan, China

Author:
Min Li; Xinfeng Wang; Chunying Lu; Rui Li; Jun Zhang; Shuwei Dong; Lingxiao Yang; Likun Xue; Jianmin Chen; Wenxing Wang
Source:
Science of the total environment 2020 v.714 pp. 136760
ISSN:
0048-9697
Subject:
2,4-dinitrophenol; adverse effects; aerosols; ambient temperature; biomass burning; carbon; catechol; coal; combustion; cresols; dominant species; gases; p-nitrophenol; particulates; phenol; salicylic acid; spring; summer; winter; China
Abstract:
... Nitrated phenols are a major class of brown carbon in the atmosphere and have adverse effects on human and plants health. They are emitted from combustion sources or produced by oxidation of phenolic precursors. In this study, fine particulates, total suspended particulates, and gas-phase samples were collected in urban Jinan in winter, spring, and summer, and UHPLC-MS analysis was used to determi ...
DOI:
10.1016/j.scitotenv.2020.136760

51. Observation of chemical components of PM2.5 and secondary inorganic aerosol formation during haze and sandy haze days in Zhengzhou, China

Author:
Zhangsen Dong; Fangcheng Su; Zhenya Zhang; Shenbo Wang
Source:
Journal of environmental sciences (China) 2020 v.88 pp. 316-325
ISSN:
1001-0742
Subject:
aerosols; ammonium; anthropogenic activities; dust; dust storms; gases; metal ions; metallic elements; monitoring; nitrates; nitrogen; nitrogen dioxide; oxidation; ozone; particulates; pollutants; pollution; relative humidity; sulfates; sulfur; sulfur dioxide; temperature; China
Abstract:
... Mineral dust particles play an important role in the formation of secondary inorganic aerosols, which largely contribute to haze pollution in China. During this study, a haze episode (haze days) and a typical haze process mixed with sandstorm (sandy haze days) were observed in Zhengzhou with a series of high-time-resolution monitoring instruments from November 22 to December 8, 2018. Concentration ...
DOI:
10.1016/j.jes.2019.09.016

52. Observations of ozone formation in southern African savanna and grassland fire plumes

Author:
Ville Vakkari; Johan P. Beukes; Miroslav Josipovic; Pieter G. van Zyl
Source:
Atmospheric environment 2020 v.223 pp. 117256
ISSN:
1352-2310
Subject:
aerosols; air quality; biomass burning; carbon monoxide; combustion; emissions; emissions factor; gases; grassland fires; grasslands; nitric oxide; ozone; particulates; savannas; sulfur dioxide; volatile organic compounds; South Africa
Abstract:
... Open biomass burning is one of the largest sources of aerosols and reactive trace gases into the atmosphere, having a significant effect on earth's radiative budget and air quality. Biomass burning degrades air quality by increasing both particulate matter and ozone levels. Unlike aerosols, ozone is not directly emitted in fires but it is frequently formed in ageing plumes. This is not surprising, ...
DOI:
10.1016/j.atmosenv.2019.117256

53. Online Scavenging of Trace Analytes in Complex Matrices for Fast Analysis by Carbon Dioxide Bubbling Extraction Coupled with Gas Chromatography–Mass Spectrometry

Author:
Yuanji Gao; Bing Xia; Yunan Qin; Ke Huang; Congling Yang; Qing Yang; Lijuan Zhao
Source:
Journal of agricultural and food chemistry 2020 v.68 no.20 pp. 5732-5740
ISSN:
1520-5118
Subject:
aerosols; anions; aqueous solutions; carbon dioxide; chemical species; desorption; gas chromatography-mass spectrometry; gases; liquids; metal ions; microbubbles; models; polycyclic aromatic hydrocarbons; rapid methods; signal strength; signal-to-noise ratio; solutes
Abstract:
... Carbon dioxide (CO₂) microbubbles can selectively enrich organic solutes from sea spray aerosols. Common bubbling extractions are normally followed by off-line separation/detection through methods such as mass spectrometry, chromatography, and spectroscopy. However, it is necessary to establish extractions with online separation and identification systems to improve efficiency and minimize sample ...
DOI:
10.1021/acs.jafc.0c01663

54. Organic and inorganic nitrogen deposition on the red pine forests at the northern foot of Mt. Fuji, Japan

Author:
Kiyoshi Matsumoto; Takuya Ogawa; Manami Ishikawa; Aki Hirai; Yuuya Watanabe; Takashi Nakano
Source:
Atmospheric environment 2020 v.237 pp. 117676
ISSN:
1352-2310
Subject:
Pinus; aerosols; ammonium nitrogen; atmospheric chemistry; bioavailability; coniferous forests; dry deposition; forest canopy; forest ecosystems; forest litter; gases; leaching; models; nitrate nitrogen; nitrite nitrogen; nitrogen compounds; organic nitrogen; rain; stemflow; throughfall; total dissolved nitrogen; trees; water solubility; wet deposition; Japan
Abstract:
... In order to clarify the deposition amounts and processes of bioavailable nitrogen species including organic forms on forests, a simultaneous observation of rainfall, throughfall, stemflow, aerosols, and their precursor gases was conducted for a two-year period at a forested site on the northern foot of Mt. Fuji in Japan. About 80–90% of the rainfall waters reached the forest floor via the throughf ...
DOI:
10.1016/j.atmosenv.2020.117676

55. Polar organic compounds in PM10 and PM2.5 atmospheric aerosols from a background Eastern Mediterranean site during the winter period: Secondary formation, distribution and source apportionment

Author:
Panagiotis Georgios Kanellopoulos; Eirini Chrysochou; Konstantinos Koukoulakis; Emily Vasileiadou; Christos Kizas; Chrysanthos Savvides; Evangelos Bakeas
Source:
Atmospheric environment 2020 v.237 pp. 117622
ISSN:
1352-2310
Subject:
aerodynamics; aerosols; anthropogenic activities; aromatic acids; atmospheric chemistry; biomass burning; carbon; derivatization; dicarboxylic acids; dust; gases; meteorological data; monocarboxylic acids; oxidation; particulates; principal component analysis; tracer techniques; unsaturated fatty acids; volatile organic compounds; winter; Cyprus
Abstract:
... Atmospheric particle samples with aerodynamic diameter <10 μm (PM₁₀) and <2.5 μm (PM₂.₅) were analyzed for elemental (EC), organic (OC) carbon and polar organic compounds. Samples were collected, on a daily basis, over 44 days during the winter period in Agia Maria Xyliatou, a background location of Cyprus. Polar organic compounds were determined using a 3-step derivatization method prior to analy ...
DOI:
10.1016/j.atmosenv.2020.117622

56. Pollution characteristics in a dusty season based on highly time-resolved online measurements in northwest China

Author:
Fanglin Wang; Yunlong Sun; Yan Tao; Yongtao Guo; Zhongqin Li; Xiuge Zhao; Sheng Zhou
Source:
Science of the total environment 2019 v.650 pp. 2545-2558
ISSN:
0048-9697
Subject:
aerosols; ammonia; ammonium; biomass; burning; calcium; chlorides; diurnal variation; dust; gases; hydrochloric acid; magnesium; models; nitrates; nitric acid; nitrous acid; oxidation; particulates; pollution; potassium; salt lakes; sodium; sulfates; sulfur; sulfur dioxide; vehicles (equipment); water solubility; China
Abstract:
... To investigate the pollution characteristics and potential sources in a dusty season, an online analyzer was used to measure trace gases and major water-soluble ions in PM₁₀ from April 1st to May 29th, 2011 in Lanzhou. The average concentrations of HONO, HNO₃, HCl, SO₂ and NH₃ were 0.93, 1.16, 0.48, 9.29 and 5.54 μg/m³, respectively, and 2.8, 2.76, 8.28 and 2.48 μg/m³ for Cl⁻, NO₃⁻, SO₄²⁻ and NH₄⁺ ...
DOI:
10.1016/j.scitotenv.2018.09.382

57. Potentially Important Contribution of Gas-Phase Oxidation of Naphthalene and Methylnaphthalene to Secondary Organic Aerosol during Haze Events in Beijing

Author:
Guancong Huang; Ying Liu; Min Shao; Yue Li; Qi Chen; Yan Zheng; Zhijun Wu; Yuechen Liu; Yusheng Wu; Min Hu; Xin Li; Sihua Lu; Chenjing Wang; Junyi Liu; Mei Zheng; Tong Zhu
Source:
Environmental science & technology 2019 v.53 no.3 pp. 1235-1244
ISSN:
1520-5851
Subject:
aerosols; gases; models; naphthalene; photooxidation; phthalic anhydride; polycyclic aromatic hydrocarbons; spectrometers; winter; China
Abstract:
... Naphthalene (Nap) and methylnaphthalene (MN) are the most abundant polycyclic aromatic hydrocarbons (PAHs) in atmosphere and have been proposed to be important precursors of anthropogenic secondary organic aerosol (SOA) derived from laboratory chamber experiments. In this study, atmospheric Nap/MN and their gas-phase photooxidation products were quantified by a Proton Transfer Reaction-Quadrupole ...
DOI:
10.1021/acs.est.8b04523

58. Regional discrepancies in spatiotemporal variations and driving forces of open crop residue burning emissions in China

Author:
Yuanqian Xu; Zhijiong Huang; Guanglin Jia; Meng Fan; Liangxiao Cheng; Liangfu Chen; Min Shao; Junyu Zheng
Source:
Science of the total environment 2019 v.671 pp. 536-547
ISSN:
0048-9697
Subject:
aerosols; burning; carbon monoxide; control methods; crop residue management; crop residues; emissions; gases; harvest date; issues and policy; moderate resolution imaging spectroradiometer; modernization; particulates; spatial variation; temporal variation; China
Abstract:
... As a major source of secondary organic aerosol, open crop residue burning (OCB) emits a large number of trace gases and particulates to the atmosphere. Extensive OCB is detected during harvest seasons in most regions of China. Emissions from OCB have been widely investigated in China, but few studies have focused on regional discrepancies in spatiotemporal variations with a long timescale. In this ...
DOI:
10.1016/j.scitotenv.2019.03.199

59. Review of aircraft measurements over China: aerosol, atmospheric photochemistry, and cloud

Author:
Jiannong Quan; Xingcan Jia
Source:
Atmospheric research 2020 v.243 pp. 104972
ISSN:
0169-8095
Subject:
aerosols; air pollution; aircraft; atmospheric chemistry; chemical composition; climate; gases; humans; particulates; photochemistry; physicochemical properties; pollutants; thermodynamics; troposphere; weather; China
Abstract:
... Aircraft measurements have been widely used in field programs to provide in-situ observations of cloud, aerosol, and atmospheric chemistry, in order to improve the scientific understanding of the structure, dynamics, and thermodynamics of cloud, and to comprehend human influences on the weather/climate system. China has experienced heavy air pollution over the past decades, with particulate matter ...
DOI:
10.1016/j.atmosres.2020.104972

60. Simultaneous measurement of the water-soluble organic nitrogen in the gas phase and aerosols at a forested site in Japan

Author:
Kiyoshi Matsumoto; Yuuya Watanabe; Ken Horiuchi; Takashi Nakano
Source:
Atmospheric environment 2019 v.200 pp. 312-318
ISSN:
1352-2310
Subject:
acidity; aerosols; ammonia; detection limit; gases; organic nitrogen; secondary productivity; soil; spring; summer; temperature; vegetation; water solubility; Japan
Abstract:
... A simultaneous observation of the water-soluble organic nitrogen (WSON) in the gaseous and particulate phases was conducted at a forested site in Japan for two years to clarify the generation mechanism and possible sources of the gaseous and particulate WSON. The concentration of the WSON in the aerosols was 0.070 μg m−3 on average, ranging from the concentration below the detection limit (DL) to ...
DOI:
10.1016/j.atmosenv.2018.12.011

61. Single source impacts on secondary pollutants using a Lagrangian reactive puff model: Comparison with photochemical grid models

Author:
Prakash Karamchandani; Pradeepa Vennam; Tejas Shah; Douglas Henn; Ana Alvarez-Gomez; Greg Yarwood; Ralph Morris; Bart Brashers; Eladio Knipping; Naresh Kumar
Source:
Atmospheric environment 2020 v.237 pp. 117664
ISSN:
1352-2310
Subject:
aerosols; atmospheric chemistry; coal; emissions; frequency distribution; gases; guidelines; meteorology; models; ozone; particulates; photochemistry; power plants; prediction; secondary pollutants; United States
Abstract:
... Recent updates to U.S. regulatory guidelines for modeling impacts of single sources to secondary pollutants, such as ozone (O₃) and fine particulate matter (PM₂.₅), require the use of established photochemical models with a complete treatment of gas-phase and aerosol chemistry as the preferred method for a Tier 2 demonstration approach. Such models include photochemical grid models (PGMs), as well ...
DOI:
10.1016/j.atmosenv.2020.117664

62. Spatial gradient of aerosol mass concentrations and size distributions over southeastern Arabian Sea and equatorial Indian Ocean during ICARB-2018

Author:
Mukunda M. Gogoi; Chakradhar Rao Tandule; Jayachandran V; Sobhan Kumar Kompalli; Vijayakumar S. Nair; K.Rama Gopal; S.Suresh Babu
Source:
Atmospheric environment 2019 v.213 pp. 727-738
ISSN:
1352-2310
Subject:
aerosols; anthropogenic activities; atmospheric chemistry; carbon; gases; longitude; rain; temporal variation; winter; Arabian Sea; Indian Ocean
Abstract:
... Continuous measurements of the mass concentrations of composite (MT) and Black Carbon (MB) aerosols were carried out on-board an Oceanographic Research Vessel (ORV) Sagar Kanya (cruise number – SK345) during its cruise (from 16 January to 13 February, 2018) over the southeastern Arabian Sea and equatorial Indian Ocean as a part of the Integrated Campaign for Aerosols, gases and Radiation Budget (I ...
DOI:
10.1016/j.atmosenv.2019.06.038

63. Spatio-temporal variations in NO2 and SO2 over Shanghai and Chongming Eco-Island measured by Ozone Monitoring Instrument (OMI) during 2008–2017

Author:
Ruibin Xue; Shanshan Wang; Danran Li; Zhong Zou; Ka Lok Chan; Pieter Valks; Alfonso Saiz-Lopez; Bin Zhou
Source:
Journal of cleaner production 2020 v.258 pp. 120563
ISSN:
0959-6526
Subject:
aerosols; air quality; desulfurization; emissions; gases; image analysis; industry; inventories; issues and policy; moderate resolution imaging spectroradiometer; monitoring; nitrogen dioxide; ozone; pollutants; pollution; satellites; spatial variation; sulfur dioxide; summer; temporal variation; time series analysis; troposphere; urban planning; winter; China
Abstract:
... High resolution satellite maps are useful for the identification of pollution hotspots. In this work, nitrogen dioxide (NO₂) and sulfur dioxide (SO₂) observations from the Ozone Monitoring Instrument (OMI) have been averaged and gridded for Shanghai and surrounding areas with a spatial resolution of 0.01° × 0.01°. The pollution maps have been used to investigate the spatio-temporal variations in N ...
DOI:
10.1016/j.jclepro.2020.120563

64. Study of interaction between cloud microphysics and chemistry using coupled bin microphysics and bin aqueous chemistry scheme

Author:
Gabriella Schmeller; István Geresdi
Source:
Atmospheric environment 2019 v.198 pp. 366-380
ISSN:
1352-2310
Subject:
aerosols; air pollution; ammonia; atmospheric chemistry; gases; hydrogen peroxide; mathematical models; mixing ratio; oxidation; ozone; sulfates; sulfur dioxide
Abstract:
... A bin chemistry scheme was developed to study sulfate production and the effect of aqueous chemistry on cloud microphysics in precipitating stratocumulus cloud using a 2D kinematical model. The impact of air pollution on aerosol processing was investigated by a comprehensive sensitivity study. The numerical simulations were carried out at different concentrations of condensation nuclei and trace g ...
DOI:
10.1016/j.atmosenv.2018.10.064

65. Temporal and spatial distribution characteristics and source origins of volatile organic compounds in a megacity of Sichuan Basin, China

Author:
Qinwen Tan; Hefan Liu; Shaodong Xie; Li Zhou; Tianli Song; Guangming Shi; Wenju Jiang; Fumo Yang; Fusheng Wei
Source:
Environmental research 2020 v.185 pp. 109478
ISSN:
0013-9351
Subject:
aerosols; basins; cities; emissions; environmental health; gas chromatography; gases; health effects assessments; inventories; mixing; mixing ratio; observational studies; ozone; pollution; pollution control; solar radiation; solvents; summer; temperature; vehicles (equipment); volatile organic compounds; China
Abstract:
... As important pollution gases and represented precursors of both ozone and second organic aerosol (SOA), the component characteristics, source origins, environmental health and emission control of volatile organic compounds (VOCs), are gaining more and more attention in Chinese megacities. In order to understand the concentration, composition and temporal and spatial distribution characteristics of ...
DOI:
10.1016/j.envres.2020.109478

66. The Impact of the Control Measures during the COVID-19 Outbreak on Air Pollution in China

Author:
Cheng Fan; Ying Li; Jie Guang; Zhengqiang Li; Abdelrazek Elnashar; Mona Allam; Gerrit de Leeuw
Source:
Remote Sensing 2020 v.12 no.10 pp. -
ISSN:
2072-4292
Subject:
COVID-19 infection; Severe acute respiratory syndrome coronavirus 2; aerosols; air pollution; air pollution control; anthropogenic activities; atmospheric chemistry; business enterprises; carbon monoxide; cities; control methods; data analysis; emissions; gases; industry; meteorological parameters; moderate resolution imaging spectroradiometer; monitoring; nitrogen dioxide; ozone; particulates; remote sensing; sulfur dioxide; traffic; troposphere; uncertainty; viruses; winter; China
Abstract:
... The outbreak of the COVID-19 virus in Wuhan, China, in January 2020 just before the Spring Festival and subsequent country-wide measures to contain the virus, effectively resulted in the lock-down of the country. Most industries and businesses were closed, traffic was largely reduced, and people were restrained to their homes. This resulted in the reduction of emissions of trace gases and aerosols ...
DOI:
10.3390/rs12101613

67. The characteristics and mixing states of PM2.5 during a winter dust storm in Ningbo of the Yangtze River Delta, China

Author:
Qiu-Liang Cai; Xiao-Rong Dai; Jian-Rong Li; Lei Tong; Yi Hui; Ming-Yang Cao; Mei Li; Hang Xiao
Source:
Science of the total environment 2020 v.709 pp. 136146
ISSN:
0048-9697
Subject:
absorption; aerosols; calcium; cations; chemical composition; cleaning; cooling; dust; dust storms; gases; hygroscopicity; nitrates; particulates; pollution; potassium; river deltas; snow; spectrometers; sulfates; winter; China; Yangtze River
Abstract:
... Dust particulates play an essential role for the nucleation, hygroscopicity and also contribute to aerosol mass. We investigated the chemical composition, size distribution and mixing states of PM₂.₅ using a single-particle aerosol mass spectrometer (SPAMS), Monitor for AeRosols and Gases (MARGA), and off-line membrane sampling from 2018.1.24 to 2018.2.20 at a coastal supersite in Ningbo, a port c ...
DOI:
10.1016/j.scitotenv.2019.136146

68. The influence of SO2 as the Criegee intermediate scavenger on the heterogeneous oxidation of oleic acid

Author:
Miao Yang; Shuai-Shuai Ma; Hamad Ashraf; Shu-Feng Pang; Yun-Hong Zhang
Source:
Atmospheric environment 2020 v.231 pp. 117560
ISSN:
1352-2310
Subject:
Fourier transform infrared spectroscopy; aerosols; atmospheric chemistry; carbon monoxide; films (materials); gases; oleic acid; oxidation; ozone; ozonolysis; relative humidity; spectrometers; sulfates; sulfur dioxide; sulfuric acid
Abstract:
... As a well-known Criegee intermediate (CI) scavenger, SO₂ can react with CIs in the gas phase to form sulphuric acid, which can be further converted to sulfate aerosols, which make an important contribution to haze formation. Despite the potential importance, the interaction of SO₂ with the CIs produced by heterogeneous oxidation of unsaturated fatty acids remains largely unclear. In this work, the ...
DOI:
10.1016/j.atmosenv.2020.117560

69. The two-way feedback effect between aerosol pollution and planetary boundary layer structure on the explosive rise of PM2.5 after the “Ten Statements of Atmosphere” in Beijing

Author:
Tian Zhang; Huizheng Che; Zhiqiang Gong; Yaqiang Wang; Jizhi Wang; Yuanqin Yang; Ke Gui; Bin Guo
Source:
Science of the total environment 2020 v.709 pp. 136259
ISSN:
0048-9697
Subject:
aerosols; air pollution control; autumn; carbon monoxide; gases; lidar; meteorological parameters; nitrogen dioxide; particulates; pollution; sulfur dioxide; troposphere; winter; China
Abstract:
... Are there still persistent heavy aerosol pollution episodes (HPEs) in Beijing one year after the implementation of the “Action Plan for the Prevention and Control of Air Pollution (“Ten Statements of Atmosphere” in China: 2013–2017)”? Will the cumulative aerosol pollution still induce significant two-way feedback between PM₂.₅ and the planetary boundary layer structure? Answers to these matters ar ...
DOI:
10.1016/j.scitotenv.2019.136259

70. Theoretical evaluation of different factors affecting the HO2 uptake coefficient driven by aqueous-phase first-order loss reaction

Author:
Jia Guo; Zhe Wang; Tao Wang; Xiaoshan Zhang
Source:
Science of the total environment 2019 v.683 pp. 146-153
ISSN:
0048-9697
Subject:
acidity; aerosols; copper; droplet size; droplets; free radicals; gases; ions; models; pH; photochemistry; variance
Abstract:
... The heterogeneous loss on aerosols is an important sink of HO2, affecting the radical chemistry and cycling, and thus it plays a key role in the atmospheric photochemistry. Gaining a reasonable HO2 uptake coefficient (γHO2) would be of great importance in evaluating the heterogeneous loss rate of HO2 on aerosols. This work was motivated by the large variance of reported HO2 mass accommodation coef ...
DOI:
10.1016/j.scitotenv.2019.05.237

71. Unraveling a New Chemical Mechanism of Missing Sulfate Formation in Aerosol Haze: Gaseous NO₂ with Aqueous HSO₃–/SO₃²–

Author:
Jinrong Yang; Lei Li; Shixian Wang; Hui Li; Joseph S. Francisco; Xiao Cheng Zeng; Yi Gao
Source:
Journal of the American Chemical Society 2019 v.141 no.49 pp. 19312-19320
ISSN:
1520-5126
Subject:
Gibbs free energy; aerosols; cities; electron transfer; gases; hydrogen bonding; nitrogen dioxide; oxidation; pollution; quantum mechanics; sulfates; sulfites; sulfur; sulfur dioxide; China
Abstract:
... A source of missing sulfate production associated with high-level fine-particle pollution in the megacities of China is believed to stem from the oxidation of a notable fraction of sulfur dioxide (SO₂) by nitrogen dioxide (NO₂) in aqueous aerosol environments, suggesting that an unknown reaction pathway exists for aqueous sulfur oxidation. At weakly acidic aerosols, the dissolved SO₂ mainly exists ...
DOI:
10.1021/jacs.9b08503

72. Vertical distributions of tropospheric formaldehyde, nitrogen dioxide, ozone and aerosol in southern China by ground-based MAX-DOAS and LIDAR measurements during PRIDE-GBA 2018 campaign

Author:
Yuhan Luo; Ke Dou; Guangqiang Fan; Shan Huang; Fuqi Si; Haijin Zhou; Yujun Wang; Chenglei Pei; Fuying Tang; Dongshang Yang; Liang Xi; Taiping Yang; Tianshu Zhang; Wenqing Liu
Source:
Atmospheric environment 2020 v.226 pp. 117384
ISSN:
1352-2310
Subject:
aerosols; air pollution; air transportation; anthropogenic activities; atmospheric chemistry; cities; emissions; formaldehyde; free radicals; gases; industry; lidar; meteorology; nitrogen dioxide; oxidation; ozone; photochemistry; power plants; remote sensing; spectroscopy; troposphere; China
Abstract:
... As the development of megacities, combined air pollution has been of increasing concern in China, which is composed by primary pollution, such as Nitrogen dioxide (NO₂), and the followed secondary pollution under certain meteorology circumstances and high concentration of precursors, such as tropospheric ozone, formaldehyde (HCHO) and fine particles. During PRIDE-GBA 2018 Campaign (Particles, Radi ...
DOI:
10.1016/j.atmosenv.2020.117384

73. Volatility parameters of secondary organic aerosol components determined using a thermal denuder

Author:
Zaeem Bin Babar; Fawad Ashraf; Jun-Hyun Park; Ho-Jin Lim
Source:
Atmospheric environment 2020 v.226 pp. 117405
ISSN:
1352-2310
Subject:
adipic acid; aerosols; atmospheric chemistry; enthalpy; gases; phthalic acid; succinic acid; temperature; volatilization
Abstract:
... In this study, the characterization of a new thermal denuder and its application to determine the volatility parameters of important components of secondary organic aerosol (SOA) are presented in detail. The temperature ramping rate to achieve a set value was ~14.3 °C min⁻¹ in the range of 25–150 °C. Particle loss during the penetration through the denuder was negligible in the temperature and eff ...
DOI:
10.1016/j.atmosenv.2020.117405

74. Waste timber pyrolysis in a medium-scale unit: Emission budgets and biochar quality

Author:
Erlend Sørmo; Ludovica Silvani; Gorm Thune; Helmut Gerber; Hans Peter Schmidt; Andreas Botnen Smebye; Gerard Cornelissen
Source:
Science of the total environment 2020 v.718 pp. 137335
ISSN:
0048-9697
Subject:
aerosols; arsenic; biochar; carbon monoxide; combustion; emissions; emissions factor; gases; heavy metals; leaves; methane; organic carbon; organic wastes; particulates; polycyclic aromatic hydrocarbons; pyrolysis; remediation; soil; soil fertility; sorbents; volatile organic compounds; wood; zinc
Abstract:
... Pyrolysis of organic waste or woody materials yields a stable carbonaceous product that can be mixed into soil and is often termed “biochar”. During pyrolysis carbon-containing gases are emitted, mainly volatile organic carbon species, carbon monoxide and aerosols. In modern pyrolysis units, gases are after-combusted, which reduces emissions substantially. However, emission data for medium- to lar ...
DOI:
10.1016/j.scitotenv.2020.137335

75. Wintertime distribution and atmospheric interactions of reactive nitrogen species along the urban transect of Delhi – NCR

Author:
Reema Tiwari; Umesh Kulshrestha
Source:
Atmospheric environment 2019 v.209 pp. 40-53
ISSN:
1352-2310
Subject:
aerosols; ambient temperature; ammonia; ammonium; ammonium nitrate; atmospheric chemistry; calcium; chemical bases; diurnal activity; gases; land use; nitric acid; nitrogen oxides; oxidation; particulates; photochemical reactions; reactive nitrogen species; relative humidity; thermodynamics; winter; India
Abstract:
... This study reports simultaneous measurements of inorganic Nr trace gases (NH3, NOx, HNO3) and the corresponding particulates (NH4+, NO3−) for elucidating photochemical interactions that are involved in their spatial and diurnal evolution along the north west – south transect of an urban NCR. Three sites were chosen with different land use characteristics where the spatial gradient in Nr precursor ...
DOI:
10.1016/j.atmosenv.2019.04.007

76. Yearly changes of the sulfate-nitrate-ammonium aerosols and the relationship with their precursors from 1999 to 2016 in Beijing

Author:
Yajun Xie
Source:
Environmental science and pollution research international 2020 v.27 no.8 pp. 8350-8358
ISSN:
0944-1344
Subject:
aerosols; air quality; dust; emissions; gases; organic carbon; particulates; time series analysis; China
Abstract:
... The change in particulate matter (PM)₂.₅ composition in relation to precursors over recent decades has not been elucidated clearly in Beijing. Using ground-based measurements from the literature, this study investigated the yearly time series of PM₂.₅ and its chemical composition over Beijing from 1999 to 2016 to identify the driving forces underlying these changes. The PM₂.₅ concentration decline ...
DOI:
10.1007/s11356-019-07493-w

77. pH effect on the release of NH3 from the internally mixed sodium succinate and ammonium sulfate aerosols

Author:
Chun-Yun Du; Hui Yang; Na Wang; Shu-Feng Pang; Yun-Hong Zhang
Source:
Atmospheric environment 2020 v.220 pp. 117101
ISSN:
1352-2310
Subject:
Fourier transform infrared spectroscopy; acid-base balance; acidity; aerosols; ammonia; ammonium; ammonium sulfate; chemical bases; crystallization; gases; hygroscopicity; protons; relative humidity; sodium sulfate; succinic acid; water content; water solubility
Abstract:
... The pH value is an important parameter of atmospheric aerosol. It affects the concentration of conjugate acid-base pair through the acid-base equilibrium and thus determines the gas–particle partitioning of acids or bases with volatility. Our recent report shows that there is a substitution of weak base for strong base in the aerosols of internally mixed water-soluble organic acid salt/ammonium su ...
DOI:
10.1016/j.atmosenv.2019.117101

78. A Simple Method to Determine Cytotoxicity of Water-Soluble Organic Compounds and Solid Particles from Biomass Combustion in Lung Cells in Vitro

Author:
Peter Zotter; Stéphane Richard; Marcel Egli; Barbara Rothen-Rutishauser; Thomas Nussbaumer
Source:
Environmental science & technology 2019 v.53 no.7 pp. 3959-3968
ISSN:
1520-5851
Subject:
adverse effects; aerosols; biomass; combustion; cytotoxicity; emissions; epithelium; gases; heating systems; humans; lethal concentration 50; lungs; organic compounds; water solubility; wood
Abstract:
... Adverse health effects of condensable organic compounds (COC) and potential secondary organic aerosols from wood combustion emissions are difficult to determine. Hence, available information is usually limited to a small number of specific applications. Therefore, we introduced a simple, fast, and economic method where water-soluble COC (WSCOC) and WSCOC together with water-soluble primary solid p ...
DOI:
10.1021/acs.est.8b03101

79. A modeling study of the influence of sea salt on inorganic aerosol concentration, size distribution, and deposition in the western Pacific Ocean

Author:
Jiawei Li; Zhiwei Han; Xiaohong Yao
Source:
Atmospheric environment 2018 v.188 pp. 157-173
ISSN:
1352-2310
Subject:
aerosols; air quality; atmospheric chemistry; gases; meteorological parameters; model validation; nitrates; nitrogen; simulation models; spring; sulfates; sulfur; water solubility; wet deposition; East Asia; Pacific Ocean
Abstract:
... A regional air quality model system (RAQMS) was developed by coupling the treatment of heterogeneous reactions between sea salt aerosols (SSAs) and trace gases and applied to the investigation of aerosol properties and evolutionary features in the western Pacific Ocean in the spring of 2014. Model results for meteorological variables, PM concentrations, and size-resolved water soluble inorganic ae ...
DOI:
10.1016/j.atmosenv.2018.06.030

80. A study on the microscopic mechanism of methanesulfonic acid-promoted binary nucleation of sulfuric acid and water

Author:
Hui Wen; Teng Huang; Chun-Yu Wang; Xiu-Qiu Peng; Shuai Jiang; Yi-Rong Liu; Wei Huang
Source:
Atmospheric environment 2018 v.191 pp. 214-226
ISSN:
1352-2310
Subject:
aerosols; dissociation; energy; evaporation rate; gases; isomers; sulfuric acid; temperature; thermodynamics
Abstract:
... Methanesulfonic acid (MSA) is believed to play an important role in the formation and growth of atmospheric organic aerosols and could facilitate the binary nucleation of sulfuric acid (SA)–water (W). However, understanding of larger clusters formed by gas-phase MSA with atmospheric nucleation precursors from microscopic aspect is lacking. In this work, to study the microscopic mechanism of the te ...
DOI:
10.1016/j.atmosenv.2018.07.050

81. Aerosol chemical component: Simulations with WRF-Chem and comparison with observations in Nanjing

Author:
Tong Sha; Xiaoyan Ma; Hailing Jia; Rong Tian; Yunhua Chang; Fang Cao; Yanlin Zhang
Source:
Atmospheric environment 2019 v.218 pp. 116982
ISSN:
1352-2310
Subject:
aerosols; air pollution; ammonium; atmospheric chemistry; cities; diurnal variation; gases; mathematical models; nitrates; oxidation; particulates; pollution control; prediction; sulfates; sulfur dioxide; China
Abstract:
... Secondary inorganic aerosols, including sulfate, nitrate, and ammonium (SNA), are the predominant components of fine particles (PM₂.₅). Reasonable representations of SNA formation in numerical models can largely improve the predictions of PM₂.₅ concentrations and effectively help implement emission control strategies. Despite the Atmospheric Pollution Prevention and Control Action Plan has been im ...
DOI:
10.1016/j.atmosenv.2019.116982

82. Aerosols in an arid environment: The role of aerosol water content, particulate acidity, precursors, and relative humidity on secondary inorganic aerosols

Author:
Haiting Wang; Jing Ding; Jiao Xu; Jie Wen; Jianhong Han; Keling Wang; Guoliang Shi; Yinchang Feng; Cesunica E. Ivey; Yuhang Wang; Athanasios Nenes; Qianyu Zhao; Armistead G. Russell
Source:
Science of the total environment 2019 v.646 pp. 564-572
ISSN:
0048-9697
Subject:
acidity; aerosols; cities; dry environmental conditions; gases; models; nitrates; nitrogen dioxide; pH; particulates; relative humidity; sulfates; sulfur dioxide; temperature; thermodynamics; water content; China
Abstract:
... Meteorological conditions, gas-phase precursors, and aerosol acidity (pH) can influence the formation of secondary inorganic aerosols (SIA) in fine particulate matter (PM₂.₅). Most works related to the influence of pH and gas-phase precursors on SIA have been laboratory research, but field observation research is very scarce, especially in arid environments. The relationship among SIA, pH, gas-pha ...
DOI:
10.1016/j.scitotenv.2018.07.321

83. Assessment of satellite-estimated near-surface sulfate and nitrate concentrations and their precursor emissions over China from 2006 to 2014

Author:
Yidan Si; Chao Yu; Luo Zhang; Wende Zhu; Kun Cai; Liangxiao Cheng; Liangfu Chen; Shenshen Li
Source:
Science of the total environment 2019 v.669 pp. 362-376
ISSN:
0048-9697
Subject:
aerosols; basins; chemical reactions; control methods; data collection; desulfurization; emissions; energy; gases; meteorological parameters; models; monitoring; nitrates; nitrogen dioxide; ozone; particulates; satellites; sulfates; sulfur dioxide; troposphere; uncertainty; China
Abstract:
... China is the largest anthropogenic aerosol-generating country worldwide; however, few studies have analyzed the PM2.5 chemical components and their underlying precursor emissions over long periods and across the national domain. First, global 3-D tropospheric chemistry and transport model (GEOS-Chem)-integrated satellite-retrieved aerosol optical depth (AOD) and vertical profiles were used to esti ...
DOI:
10.1016/j.scitotenv.2019.02.180

84. Atmospheric Oxidation of a Thiocarbamate Herbicide Used in Winter Cereals

Author:
Amalia Muñoz; Esther Borrás; Milagros Ródenas; Teresa Vera; Hans Albert Pedersen
Source:
Environmental science & technology 2018 v.52 no.16 pp. 9136-9144
ISSN:
1520-5851
Subject:
aerosols; atmospheric pressure; benzaldehyde; free radicals; gases; grains; hydroxyl radicals; nitrogen oxides; oxidation; ozone; pesticide application; photolysis; solar radiation; winter; Spain
Abstract:
... The gas-phase atmospheric degradation of prosulfocarb (a widely used thiocarbamate herbicide in winter cereals) at different NOx concentrations was investigated at the large outdoor European PHOtoREactor (EUPHORE) in Valencia, Spain. Photolysis under sunlight conditions and reaction with ozone were shown as unimportant. The rate constant for the reaction of prosulfocarb with OH radicals was determ ...
DOI:
10.1021/acs.est.8b02157

85. Characterisation of emission from open-field burning of crop residue during harvesting period in north-west India

Author:
Prasenjit Acharya; Sreedharan Sreekesh; Umesh Kulshrestha; Gyan Gupta
Source:
Environmental monitoring and assessment 2018 v.190 no.11 pp. 663
ISSN:
0167-6369
Subject:
absorption; aerosols; air pollution; aluminum; burning; carbonates; combustion; crop residue management; elemental composition; energy-dispersive X-ray analysis; fluorides; gases; greenhouse gas emissions; greenhouse gases; ion exchange chromatography; iron; magnesium; nitrogen dioxide; opacity; potassium; rice; rice straw; scanning electron microscopy; silicates; silicon; sodium; statistical analysis; sulfates; sulfur dioxide; wheat; wheat straw; zinc; India
Abstract:
... Open-field crop residue burning is one of the important sources of atmospheric pollution in north-west India during the harvesting period. In this work, we studied NO₂ and SO₂ concentrations and physical and chemical properties of aerosols from open-field combustion of rice and wheat residue. NO₂ and SO₂ were analysed using UV-spectrophotometer and ion chromatography (IC) respectively. The aerosol ...
DOI:
10.1007/s10661-018-6999-2

86. Characteristics of atmospheric volatile organic compounds (VOCs) at a mountainous forest site and two urban sites in the southeast of China

Author:
Zhenyu Hong; Mengze Li; Hong Wang; Lingling Xu; Youwei Hong; Jinsheng Chen; Junhuai Chen; Han Zhang; Yanru Zhang; Xin Wu; Baoye Hu; Mengren Li
Source:
Science of the total environment 2019 v.657 pp. 1491-1500
ISSN:
0048-9697
Subject:
aerosols; air pollution; air quality; altitude; aromatic compounds; biomass; burning; diurnal variation; emissions; forests; free radicals; gases; human health; isoprene; monitoring; mountains; oxidants; ozone; petroleum; propylene; solvents; summer; urban areas; urbanization; volatile organic compounds; winter; China
Abstract:
... Volatile organic compounds (VOCs) are important trace gases in the atmosphere, affecting air quality (e.g. ozone and secondary organic aerosol formation) and human health. To understand the emission, transport and chemistry of VOCs in the southeast of China (Fujian Province), a campaign was conducted in summer and winter of 2016 at three contrasting sites in close proximity. One measurement site ( ...
DOI:
10.1016/j.scitotenv.2018.12.132

87. Characteristics of gaseous and particulate ammonia and their role in the formation of secondary inorganic particulate matter at Delhi, India

Author:
Saraswati; S.K. Sharma; Mohit Saxena; T.K. Mandal
Source:
Atmospheric research 2019 v.218 pp. 34-49
ISSN:
0169-8095
Subject:
aerosols; ammonia; ammonium; ammonium nitrate; chlorides; gases; mixing ratio; neutralization; nitric acid; nitric oxide; nitrogen dioxide; particulates; relative humidity; sulfates; sulfur dioxide; summer; temperature; water solubility; winter; India
Abstract:
... Chemical characteristics of ambient ammonia (NH3), other trace gases (NO, NO2, SO2, and HNO3) and ionic species (NH4+, SO42−, NO3− and Cl− etc.,) of PM2.5 were estimated from January 2013 to December 2015 at an urban site of Delhi, India to evaluate the role of ambient NH3 in the formation of secondary inorganic aerosols over Delhi. The average mixing ratios of ambient NH3, NO, NO2, SO2 and HNO3 w ...
DOI:
10.1016/j.atmosres.2018.11.010

88. Characterization and variability of inorganic aerosols and their gaseous precursors at a suburban site in northern France over one year (2015–2016)

Author:
Roger Roig Rodelas; Esperanza Perdrix; Benoît Herbin; Véronique Riffault
Source:
Atmospheric environment 2019 v.200 pp. 142-157
ISSN:
1352-2310
Subject:
aerosols; ammonia; ammonium; ammonium nitrate; atmospheric chemistry; calcium; chlorides; emissions; gases; hydrochloric acid; magnesium; nitric acid; nitric oxide; nitrogen dioxide; nitrous acid; particulates; potassium; sodium; spring; sulfates; sulfur dioxide; thermodynamics; water solubility; Belgium; France; Germany; Netherlands
Abstract:
... Measurements of inorganic precursor gases (NO, NO2, HONO, NH3, SO2 and HCl) and PM2.5 inorganic water-soluble ions (NO3−, SO42−, NH4+, Cl−, Na+, Mg2+, Ca2+, K+) were performed at a suburban site in northern France for the first time using a MARGA 1S with an hourly time-resolution from August 2015 to July 2016. The observations were compared with other independent methods: HR-ToF-AMS, BAM-1020, SO2 ...
DOI:
10.1016/j.atmosenv.2018.11.041

89. Characterization of Gas-Phase Organics Using Proton Transfer Reaction Time-of-Flight Mass Spectrometry: Residential Coal Combustion

Author:
Felix Klein; Simone M. Pieber; Haiyan Ni; Giulia Stefenelli; Amelie Bertrand; Dogushan Kilic; Veronika Pospisilova; Brice Temime-Roussel; Nicolas Marchand; Imad El Haddad; Jay G. Slowik; Urs Baltensperger; Junji Cao; Ru-jin Huang; André S. H. Prévôt
Source:
Environmental science & technology 2018 v.52 no.5 pp. 2612-2617
ISSN:
1520-5851
Subject:
aerosols; air pollution; aromatic compounds; burning; chemical composition; cities; coal; combustion; cooking; emissions factor; gases; heaters; hydrocarbons; mass spectrometry; models; particulate emissions; spectrometers; China; Eastern European region; Europe
Abstract:
... Residential coal combustion is a significant contributor to particulate urban air pollution in Chinese mega cities and some regions in Europe. While the particulate emission factors and the chemical characteristics of the organic and inorganic aerosol from coal combustion have been extensively studied, the chemical composition and nonmethane organic gas (NMOG) emission factors from residential coa ...
DOI:
10.1021/acs.est.7b03960

90. Climate Feedback on Aerosol Emission and Atmospheric Concentrations

Author:
Ina Tegen; Kerstin Schepanski
Source:
Current climate change reports 2018 v.4 no.1 pp. 1-10
ISSN:
2198-6061
Subject:
aerosols; biomass; burning; climate change; climatic factors; dust; emissions; gases; mixing; temperature; vegetation; volatile organic compounds; wind speed
Abstract:
... PURPOSE OF REVIEW: Climate factors may considerably impact on natural aerosol emissions and atmospheric distributions. The interdependencies of processes within the aerosol-climate system may thus cause climate feedbacks that need to be understood. Recent findings on various major climate impacts on aerosol distributions are summarized in this review. RECENT FINDINGS: While generally atmospheric a ...
DOI:
10.1007/s40641-018-0086-1

91. Column-integrated aerosol optical properties of coarse- and fine-mode particles over the Pearl River Delta region in China

Author:
B. Mai; X. Deng; X. Xia; H. Che; J. Guo; X. Liu; J. Zhu; C. Ling
Source:
Science of the total environment 2018 v.622-623 pp. 481-492
ISSN:
0048-9697
Subject:
absorption; aerosols; emissions; gases; nitrates; nitrogen dioxide; optical properties; oxidation; relative humidity; river deltas; rivers; solar radiation; sulfates; sulfur dioxide; summer; temperature; wavelengths; China
Abstract:
... The sun-photometer data from 2011 to 2013 at Panyu site (Panyu) and from 2007 to 2013 at Dongguan site (Dg) in the Pearl River Delta region, were used for the retrieving of the aerosol optical depth (AOD), single scattering albedo (SSA), Ångström exponent (AE) and volume size distribution of coarse- and fine-mode particles. The coarse-mode particles presented low AOD (ranging from 0.05±0.03 to 0.0 ...
DOI:
10.1016/j.scitotenv.2017.11.348

92. Contribution of ship emissions to the concentration of PM2.5: A comprehensive study using AIS data and WRF/Chem model in Bohai Rim Region, China

Author:
Dongsheng Chen; Na Zhao; Jianlei Lang; Ying Zhou; Xiaotong Wang; Yue Li; Yuehua Zhao; Xiurui Guo
Source:
Science of the total environment 2018 v.610-611 pp. 1476-1486
ISSN:
0048-9697
Subject:
aerosols; autumn; carbon dioxide; carbon monoxide; cities; emissions; gases; hosts; hydrocarbons; inventories; models; nitrogen oxides; particulates; seasonal variation; ships; shorelines; spring; statistics; sulfur dioxide; summer; winter; China
Abstract:
... Compared with on-road vehicles, emission from ships is one of the least-regulated anthropogenic emission sources and non-negligible source of primary aerosols and gas-phase precursors of PM₂.₅. The Bohai Rim Region in China hosts dozens of large ports, two of which ranked among the top ten ports in the world. To determine the impact of ship emissions on the PM₂.₅ concentrations over this region, t ...
DOI:
10.1016/j.scitotenv.2017.07.255

93. Cutting floating single-walled carbon nanotubes with a ‘CO2 blade’

Author:
Ying Tian; Nan Wei; Patrik Laiho; Saeed Ahmad; Yann Magnin; Yongping Liao; Christophe Bichara; Hua Jiang; Esko I. Kauppinen
Source:
Carbon 2019 v.143 pp. 481-486
ISSN:
0008-6223
Subject:
aerosols; carbon; carbon dioxide; carbon nanotubes; cutting; dry deposition; gases
Abstract:
... Uniform ultra-short (<100 nm) single-walled carbon nanotubes (SWCNTs) with properties of rich chemistry, high dispersity and easy manipulation, are of great importance for constructing novel nano-structures and highly integrated miniature devices. Herein, we report a recent breakthrough in cutting long SWCNTs into uniform ultra-short segments in gas-phase using CO₂ as a ‘blade.’ SWCNTs synthesized ...
DOI:
10.1016/j.carbon.2018.11.035

94. Differences of the oxidation process and secondary organic aerosol formation at low and high precursor concentrations

Author:
Tianzeng Chen; Yongchun Liu; Biwu Chu; Changgeng Liu; Jun Liu; Yanli Ge; Qingxin Ma; Jinzhu Ma; Hong He
Source:
Journal of environmental sciences (China) 2019 v.79 pp. 256-263
ISSN:
1001-0742
Subject:
aerosols; air quality; gases; models; oxidants; oxidation; volatile organic compounds
Abstract:
... Current atmospheric quality models usually underestimate the level of ambient secondary organic aerosol (SOA), one of the possible reasons is that the precursors at different concentrations may undergo different oxidation processes and further affect SOA formation. Therefore, there is a need to perform more chamber studies to disclose the influence. In this work, SOA formation over a wide range of ...
DOI:
10.1016/j.jes.2018.11.011

95. Emission of intermediate, semi and low volatile organic compounds from traffic and their impact on secondary organic aerosol concentrations over Greater Paris

Author:
K. Sartelet; S. Zhu; S. Moukhtar; M. André; J.M. André; V. Gros; O. Favez; A. Brasseur; M. Redaelli
Source:
Atmospheric environment 2018 v.180 pp. 126-137
ISSN:
1352-2310
Subject:
aerosols; air quality; atmospheric chemistry; carbon; gases; gasoline; highways; models; organic compounds; particulate emissions; traffic; urban areas; volatile organic compounds
Abstract:
... Exhaust particle emissions are mostly made of black carbon and/or organic compounds, with some of these organic compounds existing in both the gas and particle phases. Although emissions of volatile organic compounds (VOC) are usually measured at the exhaust, emissions in the gas phase of lower volatility compounds (POAvapor) are not. However, these gas-phase emissions may be oxidised after emissi ...
DOI:
10.1016/j.atmosenv.2018.02.031

96. Enhanced Chlorine and Bromine Atom Activation by Hydrolysis of Halogen Nitrates from Marine Aerosols at Polluted Coastal Areas

Author:
Erik H. Hoffmann; Andreas Tilgner; Ralf Wolke; Hartmut Herrmann
Source:
Environmental science & technology 2018 v.53 no.2 pp. 771-778
ISSN:
1520-5851
Subject:
aerosols; air quality; bromine; chlorine; coasts; gases; hydrolysis; models; nitrates; photolysis; prediction
Abstract:
... Detailed multiphase chemistry box model studies are carried out, investigating halogen radical activation at polluted coastal areas. Simulations are performed for a nonpermanent cloud and a cloud-free scenario and reveal that ClNO₂ photolysis and ICl photolysis are crucial for gas-phase Cl atom activation. In the cloud scenario, the integrated ClNO₂ and ICl photolysis rates are 3.7 × 10⁷ and 3.1 × ...
DOI:
10.1021/acs.est.8b05165

97. Estimation of biogenic VOC emissions and their corresponding impact on ozone and secondary organic aerosol formation in China

Author:
Kai Wu; Xianyu Yang; Dean Chen; Shan Gu; Yaqiong Lu; Qi Jiang; Kun Wang; Yihan Ou; Yan Qian; Ping Shao; Shihua Lu
Source:
Atmospheric research 2019 pp. -
ISSN:
0169-8095
Subject:
aerosols; basins; climate; emissions; environmental science; gases; models; ozone; river deltas; rivers; summer; urban areas; volatile organic compounds; China; Yangtze River
Abstract:
... Biogenic volatile organic compounds (BVOC) play an important role in global environmental chemistry and climate. In the present work, biogenic emissions from China in 2017 were estimated based on the Model of Emissions of Gases and Aerosols from Nature (MEGAN). The effects of BVOC emissions on ozone and secondary organic aerosol (SOA) formation were investigated using the WRF-CMAQ modeling system. ...
DOI:
10.1016/j.atmosres.2019.104656

98. Evaluation of nanosilica emission in polydimethylsiloxane composite during incineration

Author:
G. Ounoughene; C. Chivas-Joly; C. Longuet; O. Le Bihan; J-M. Lopez-Cuesta; L. Le Coq
Source:
Journal of hazardous materials 2019 v.371 pp. 415-422
ISSN:
0304-3894
Subject:
aerosols; calorimeters; combustion; furnaces; gases; nanocomposites; nanomaterials; particulates; polydimethylsiloxane; risk; silica; silicon
Abstract:
... At the end of their life cycle, it is expected that many industrial silicone components end up in incineration waste plants. Hence, the issue concerning the risks resulting from the generation of fumes (combustion gas and aerosol) has to be addressed. The aim of our work was to investigate the behavior and fate of nanosilicas from filled polydimethylsiloxane nanocomposites burnt under two differen ...
DOI:
10.1016/j.jhazmat.2019.03.026

99. Exploring Conditions for Ultrafine Particle Formation from Oxidation of Cigarette Smoke in Indoor Environments

Author:
Chen Wang; Douglas B. Collins; Rachel F. Hems; Nadine Borduas; María Antiñolo; Jonathan P.D. Abbatt
Source:
Environmental science & technology 2018 v.52 no.8 pp. 4623-4631
ISSN:
1520-5851
Subject:
aerosols; environmental science; fluorescent lamps; fluorescent lighting; gases; hydroxyl radicals; nitric oxide; nitrogen dioxide; oxidation; ozone; smoke
Abstract:
... Cigarette smoke is an important source of particles and gases in the indoor environment. In this work, aging of side-stream cigarette smoke was studied in an environmental chamber via exposure to ozone (O₃), hydroxyl radicals (OH) and indoor fluorescent lights. Aerosol mass concentrations increased by 13–18% upon exposure to 15 ppb O₃ and by 8–42% upon exposure to 0.45 ppt OH. Ultrafine particle ( ...
DOI:
10.1021/acs.est.7b06608

100. Formation of oxidized organic compounds from Cl-initiated oxidation of toluene

Author:
Surya Venkatesh Dhulipala; Sahil Bhandari; Lea Hildebrandt Ruiz
Source:
Atmospheric environment 2019 v.199 pp. 265-273
ISSN:
1352-2310
Subject:
aerosols; air quality; atmospheric chemistry; chemical speciation; chlorine; gases; human health; ionization; nitrogen oxides; oxidants; oxidation; spectrometers; toluene; troposphere
Abstract:
... The formation of secondary organic aerosol (SOA) from toluene can impact urban air quality and therefore human health. Most SOA studies have focused on OH chemistry; however recent work suggests that chlorine atoms (Cl) may affect tropospheric chemistry more than previously assumed. This work focuses on SOA formation from Cl-initiated oxidation of toluene under different conditions. The fast react ...
DOI:
10.1016/j.atmosenv.2018.11.002