| Title: | "Identify the key emission sources for mitigating ozone pollution: A case study of urban area in the Yangtze River Delta region, China" |
| Author(s): | Zhang X; Ma Q; Chu W; Ning M; Liu X; Xiao F; Cai N; Wu Z; Yan G; |
| Address: | "State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; Chinese Academy of Environmental Planning, Beijing 100041, China. Chinese Academy of Environmental Planning, Beijing 100041, China. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. Chinese Academy of Environmental Planning, Beijing 100041, China. Electronic address: ningmiao@caep.org.cn. Suzhou Environmental Monitoring Station, Suzhou 215000, China. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China. Electronic address: zhijunwu@pku.edu.cn. Chinese Academy of Environmental Planning, Beijing 100041, China. Electronic address: yangang@caep.org.cn" |
| DOI: | 10.1016/j.scitotenv.2023.164703 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "Ozone (O(3)) has become the most critical air pollutant in the Yangtze River Delta (YRD) region of China. Research on the O(3) formation mechanism and its precursor sources (including nitrogen oxides (NO(X)) and volatile organic compounds (VOCs)) could provide a theoretical basis for mitigating O(3) pollution in this region. In this study, simultaneous field experiments were conducted for air pollutants in a typical urban area (Suzhou) in the YRD region in 2022. The capacity of in-situ O(3) formation, O(3)-NO(X)-VOCs sensitivities and sources of O(3) precursors were analyzed. The results showed that in-situ formation contributed 20.8 % of the O(3) concentration in the warm season (April to October) of the Suzhou urban area. Compared with the warm season average, the concentrations of various O(3) precursors increased on pollution days. The O(3)-NO(X)-VOCs sensitivity was the VOCs-limited regime based on the average concentrations during the warm season. O(3) formation was most sensitive to anthropogenic VOCs, of which oxygenated VOCs, alkenes and aromatics were the key species. There was a VOCs-limited regime in spring and autumn, while a transitional regime in summer due to the changes in NO(X) concentrations. This study considered NO(X) emission from VOCs sources and calculated the contribution of various sources to O(3) formation. The results of VOCs source apportionment showed that diesel engine exhaust and fossil fuel combustion had a dominant proportion, but O(3) formation presented significant negative sensitivities to the above two sources because of their high NO(X) emissions. There were significant sensitivities of O(3) formation to gasoline vehicle exhaust and VOCs evaporative emissions (gasoline evaporation and solvent usage). The contribution of VOCs evaporative emissions during the O(3) pollution episode was significantly higher than the average; therefore, controlling VOCs evaporative emissions during the O(3) pollution episode is critical. These results provide feasible strategies to mitigate O(3) pollution" |
| Keywords: | *Ozone/analysis Gasoline Environmental Monitoring/methods China *Air Pollutants/analysis *Volatile Organic Compounds/analysis Vehicle Emissions/analysis Control strategy O(3)-NO(X)-VOCs sensitivity Ozone Source apportionment The YRD region VOCs; |
| Notes: | "PubMed-not-MEDLINEZhang, Xin Ma, Qiang Chu, Wanghui Ning, Miao Liu, Xiaoqiu Xiao, Fanjie Cai, Ningning Wu, Zhijun Yan, Gang eng Netherlands 2023/06/09 Sci Total Environ. 2023 Sep 20; 892:164703. doi: 10.1016/j.scitotenv.2023.164703. Epub 2023 Jun 7" |
