| Title: | "Exploring ozone pollution in Chengdu, southwestern China: A case study from radical chemistry to O(3)-VOC-NO(x) sensitivity" |
| Author(s): | Tan Z; Lu K; Jiang M; Su R; Dong H; Zeng L; Xie S; Tan Q; Zhang Y; |
| Address: | "State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China. Electronic address: k.lu@pku.edu.cn. Chengdu Academy of Environmental Sciences, Chengdu, China. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China; Beijing Innovation Center for Engineering Sciences and Advanced Technology, Peking University, 100871, Beijing, China. Electronic address: yhzhang@pku.edu.cn" |
| DOI: | 10.1016/j.scitotenv.2018.04.286 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "We present the in-situ measurements in Chengdu, a major city in south west of China, in September 2016. The concentrations of ozone and its precursor were measured at four sites. Although the campaign was conducted in early autumn, up to 100?ª+ppbv (parts per billion by volume) daily maximum ozone was often observed at all sites. The observed ozone concentrations showed good agreement at all sites, which implied that ozone pollution is a regional issue in Chengdu. To better understand the ozone formation in Chengdu, an observation based model is used in this study to calculate the RO(x) radical concentrations (RO(x)?ª+=?ª+OH?ª++?ª+HO(2)?ª++?ª+RO(2)) and ozone production rate (P(O(3))). The model predicts OH daily maximum is in the range of 4-8?ª+x?ª+10(6)?ª+molecules?ª+cm(-3), and HO(2) and RO(2) are in the range of 3-6?ª+x?ª+10(8)?ª+molecules?ª+cm(-3). The modelled radical concentrations show a distinct difference between ozone pollution and attainment period. The relative incremental reactivity (RIR) results demonstrate that anthropogenic VOCs reduction is the most efficient way to mitigate ozone pollution at all sites, of which alkenes dominate >50% of the ozone production. Empirical kinetic modelling approach shows that three out of four sites are under the VOC-limited regime, while Pengzhou is in a transition regime due to the local petrochemical industry. The ozone budget analysis showed that the local ozone production driven by the photochemical process is important to the accumulation of ozone concentrations" |
| Keywords: | Air Pollutants/*analysis Air Pollution/statistics & numerical data China Cities *Environmental Monitoring Ozone/*analysis Volatile Organic Compounds/analysis Chengdu Ekma Ozone Rir RO(x) radicals; |
| Notes: | "MedlineTan, Zhaofeng Lu, Keding Jiang, Meiqing Su, Rong Dong, Huabin Zeng, Limin Xie, Shaodong Tan, Qinwen Zhang, Yuanhang eng Netherlands 2018/05/05 Sci Total Environ. 2018 Sep 15; 636:775-786. doi: 10.1016/j.scitotenv.2018.04.286. Epub 2018 May 1" |
