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Characteristics of ambient ozone (O3) pollution and health risks in Zhejiang Province
- Chen, Yuanchen, Zang, Lu, Chen, Jinyuan, Xu, Da, Yao, Defei, Zhao, Meirong
- Environmental science and pollution research international 2017 v.24 no.35 pp. 27436-27444
- cities, confidence interval, correlation, dose response, models, nitrogen dioxide, ozone, particulates, pollutants, relative humidity, respiratory tract diseases, risk, sulfur dioxide, summer, temperature, troposphere, wind speed, winter, China
- Troposphere ozone, which is from secondary formation processes, has been increasing dramatically during the last decades in China, inducing high health risks. In this study, temporal and spatial distribution of O₃ was studied among 13 sites of three cities during 2014–2016. The objectives were to clarify the characteristics of the ambient pollution of O₃ under the influence from other pollutants and meteorological parameters and the health outcomes from exposure to O₃. The concentrations of O₃ during summer were much higher than those during winter, and the concentrations in downtown areas were higher than in rural or mountain areas. PM₂.₅, NO₂, SO₂, and wind speed (WS) were negatively correlated with O₃, and CO, temperature (T), and relative humidity (RH) were positively correlated with O₃. In multivariable analysis, two separate factors—solar radiation and atmospheric diffusion status, affected the O₃ levels. The concentrations of O₃ reached the highest level at 15:00 and the lowest value at about 6:00–8:00, with the similar trend to T and WS, and opposite to RH. According to the dose-response model, relative risks (RRs) and population attributable fractions (PAFs) with confidence intervals (CIs) for chronic obstructive pulmonary disease (COPD) from exposure to O₃ were 1.0612 (CI 1.0607–1.0616) and 5.32% (CI 5.29–5.36%), respectively, attributable to 2000 deaths in Zhejiang Province in 2014.