| Title: | "Characteristics, sources of volatile organic compounds, and their contributions to secondary air pollution during different periods in Beijing, China" |
| Author(s): | Liang S; Gao S; Wang S; Chai W; Chen W; Tang G; |
| Address: | "China National Environmental Monitoring Centre, Beijing 100012, China. Electronic address: liangsy@cnemc.cn. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China. China National Environmental Monitoring Centre, Beijing 100012, China. Nanjing Intelligent Environmental Science and Technology Co., Ltd., Nanjing 211800, China" |
| DOI: | 10.1016/j.scitotenv.2022.159831 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "Continuous measurements of volatile organic compounds (VOCs), ozone (O(3)), fine particulate matter (PM(2.5)), and related parameters were conducted between April 2020 and March 2021 in Beijing, China, to characterize potential sources of VOCs and their impacts on secondary organic aerosols (SOAs) and O(3) levels. The annual average mixing ratio of VOCs was 17.4 +/- 10.1 ppbv, with monthly averages ranging from 11.6 to 25.2 ppbv. According to the empirical kinetic modeling approach (EKMA), O(3) formation during O(3) season was 'VOCs-limited', while it was in a 'transition' regime during O(3) pollution episodes. In the O(3) season, higher ozone formation potential (OFP) of m/p-xylene, o-xylene, toluene, isopentane, and n-butane were evident during O(3) pollution episodes, in line with the increasing contributions of solvent usage and coating, as well as gasoline evaporation to OFP obtained through a matrix factorization model (PMF). Aromatics contributed the most to the secondary organic aerosol formation potential (SOAFP). In the non-O(3) season, the contribution of vehicle exhaust to SOAFP elevated on hazy days, thereby revealing the importance of traffic-derived VOCs for PM(2.5) pollution. Our results indicate that the prior control of different VOC sources should vary by season, thereby facilitating the synergistic control of O(3) and PM(2.5) in Beijing" |
| Keywords: | *Volatile Organic Compounds/analysis *Air Pollutants/analysis Beijing Environmental Monitoring/methods *Air Pollution Vehicle Emissions/analysis *Ozone/analysis Particulate Matter/analysis Aerosols China Ozone formation potential Ozone sensitivity Seconda; |
| Notes: | "MedlineLiang, Siyuan Gao, Song Wang, Shuai Chai, Wenxuan Chen, Wentai Tang, Guigang eng Netherlands 2022/11/07 Sci Total Environ. 2023 Feb 1; 858(Pt 2):159831. doi: 10.1016/j.scitotenv.2022.159831. Epub 2022 Nov 4" |
