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Sci Total Environ

Title:		"Exploration of O(3)-precursor relationship and observation-oriented O(3) control strategies in a non-provincial capital city, southwestern China"
Author(s):		Xie Y; Cheng C; Wang Z; Wang K; Wang Y; Zhang X; Li X; Ren L; Liu M; Li M;
Address:		"Institute of Mass Spectrometry and Atmospheric Environment, Guangdong Provincial Engineering Research Center for on-line source apportionment system of air pollution, Jinan University, Guangzhou 510632, China; Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou 510632, China. Institute of Resources Comprehensive Utilization, Guangdong Academy of Sciences, Guangzhou 510650, China. School of Environment and Energy, South China University of Technology, Guangzhou 510006, China. Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China. Sichuan Leshan Ecological Environment Monitoring Center Station, Leshan 614000, China; Bureau of Ecology Environment of Leshan, Leshan 614000, China. Bureau of Ecology Environment of Leshan, Leshan 614000, China; Leshan Institute of Environmental Science, Leshan 614000, China. Bureau of Ecology Environment of Leshan, Leshan 614000, China. Guangzhou Hexin Analytical Instrument Company Limited, Guangzhou 510530, China. Institute of Mass Spectrometry and Atmospheric Environment, Guangdong Provincial Engineering Research Center for on-line source apportionment system of air pollution, Jinan University, Guangzhou 510632, China; Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou 510632, China. Electronic address: limei@jnu.edu.cn"
Journal Title:		Sci Total Environ
Year:		2021
Volume:		20210803
Issue:
Page Number:		149422 -
DOI:		10.1016/j.scitotenv.2021.149422
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"To investigate photochemical ozone (O(3)) formation and provide localized control strategies, an intensive sampling of O(3) and its precursors (i.e. volatile organic compounds (VOCs) and nitrogen oxides (NO(x) = NO + NO(2))) were conducted at an urban site in Leshan, Sichuan province during 4-13 August 2019. The mixing ratios of O(3), total VOCs (TVOCs) and NO(x) were 40.0 +/- 5.3, 22.5 +/- 2.6 and 14.6 +/- 3.8 ppbv, respectively (+/-95% confidence intervals). O(3) and its precursors existed a well negative correlation, indicating intensive local O(3) formation. To further explore the O(3)-precursors relationship and observation-oriented O(3) control strategies, a photochemical box model coupled with master chemical mechanism (PBM-MCM) was adapted. The relative incremental reactivity (RIR) calculated by model results showed that Leshan was in the VOCs-limited and O(3) production was most sensitive to alkenes. Moreover, O(3) isopleth diagram was drawn using the PBM-MCM simulation results and seven reduction scenarios were evaluated in Leshan. The reduction ratio of VOCs/NO(x) on 3:1 was proposed to be the best solution, which can be achieved effective reduction on local O(3) formation. At last, since VOCs were the key precursors of O(3) in Leshan, VOC sources and their potential contributions to O(3) formation were investigated by using the positive matrix factorization (PMF) model. Seven sources were identified, and traffic related emissions (including vehicle exhaust and gasoline evaporation, 29.9%) and fixed combustion (27.7%) had the large contribution to ambient VOCs. Among anthropogenic sources, fixed combustion and solvent usage in painting were the large contributors to O(3) formation, accounting for 30.9% and 18.3%, respectively, which should have high priorities on source reduction. This study provides scientific advices for future O(3) pollution control strategies in Leshan, which can be extended to other cities"
Keywords:		*Air Pollutants/analysis China Cities Environmental Monitoring *Ozone/analysis O(3) control strategies O(3) isopleth diagram O(3)-precursor relationships Pbm-mcm VOC sources;
Notes:		"MedlineXie, Yutong Cheng, Chunlei Wang, Zaihua Wang, Ke Wang, Yu Zhang, Xichang Li, Xingheng Ren, Lijun Liu, Ming Li, Mei eng Netherlands 2021/08/25 Sci Total Environ. 2021 Dec 15; 800:149422. doi: 10.1016/j.scitotenv.2021.149422. Epub 2021 Aug 3"