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Environ Int

Title:		Quantitative evidence from VOCs source apportionment reveals O(3) control strategies in northern and southern China
Author(s):		Wang Z; Tian X; Li J; Wang F; Liang W; Zhao H; Huang B; Wang Z; Feng Y; Shi G;
Address:		"State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; CMA-NKU Cooperative Laboratory for Atmospheric Environment-Health Research (CLAER), College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China. Guangzhou Hexin Instrument Co., Ltd, Guangzhou 510530, China. Institute of Resources Utilization and Rare Earth Development, Guangdong Academy of Sciences, Guangzhou 510650, China. Electronic address: zaihuawang@163.com. State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; CMA-NKU Cooperative Laboratory for Atmospheric Environment-Health Research (CLAER), College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China. Electronic address: nksgl@nankai.edu.cn"
Journal Title:		Environ Int
Year:		2023
Volume:		20230130
Issue:
Page Number:		107786 -
DOI:		10.1016/j.envint.2023.107786
ISSN/ISBN:		1873-6750 (Electronic) 0160-4120 (Linking)
Abstract:		"Ground-level ozone (O(3)) pollution has received widespread attention because its rising trend and adverse ecological impacts. However, the extremely strong photochemical reactions of its precursor volatile organic compounds (VOCs) increase the difficulty of reducing VOCs emissions to alleviate O(3). Here, we carried out a one-year comprehensive observation in two representative cities, Tianjin (TJ, Northern China) and Guangzhou (GZ, Southern China). By revealing the concentration characteristics of three different types of VOCs, i.e., initial VOCs without photochemical reaction (In-VOCs), consumed VOCs (C-VOCs), and measured VOCs after the reaction (M-VOCs), we elucidated the important role of C-VOCs in the formation of O(3). Although the overall trends were similar in both cities, the average concentration level of VOCs in GZ was 8.2 ppbv higher than that in TJ, and the photochemical loss of VOCs was greater by 2.2 ppbv. In addition, various drivers affecting O(3) generation from C-VOCs were specifically explored, and it was found that most alkenes of TJ were key substances for rapid O(3) formation compared to aromatics of GZ. Meanwhile, favorable meteorological conditions such as high temperature (T > 31 degrees C in TJ, and T > 33 degrees C in GZ), low relative humidity (56% in TJ and 45% in GZ), and stable atmospheric environment (proper pressure and gentle wind speed) also contribute to the generation of O(3). More importantly, we combined chemical kinetics and receptor model to quantify the three-type VOCs source contributions and assess the potential impact of C-VOCs sources on O(3) production, thus proposing environmental abatement technologies corresponding to the three types of VOCs. The differences in the comparison results of the three-type VOCs highlight the need to reduce O(3) pollution from C-VOCs sources, which provides insights for future clean air policies development"
Keywords:		*Air Pollutants/analysis *Volatile Organic Compounds/analysis Environmental Monitoring/methods China *Ozone/analysis Different drivers Ozone Photochemical consumption Source apportionment Volatile organic compounds;
Notes:		"MedlineWang, Zhenyu Tian, Xiao Li, Jie Wang, Feng Liang, Weiqing Zhao, Huan Huang, Bo Wang, Zaihua Feng, Yinchang Shi, Guoliang eng Research Support, Non-U.S. Gov't Netherlands 2023/02/05 Environ Int. 2023 Feb; 172:107786. doi: 10.1016/j.envint.2023.107786. Epub 2023 Jan 30"