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Sci Total Environ

Title:		Quantifying the role of PM(2.5) dropping in variations of ground-level ozone: Inter-comparison between Beijing and Los Angeles
Author(s):		Shao M; Wang W; Yuan B; Parrish DD; Li X; Lu K; Wu L; Wang X; Mo Z; Yang S; Peng Y; Kuang Y; Chen W; Hu M; Zeng L; Su H; Cheng Y; Zheng J; Zhang Y;
Address:		"Institute for Environmental and Climate Research, Jinan University, Guangzhou, China; Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, China; College of Environmental Sciences and Engineering, Peking University, Beijing, China. College of Environmental Sciences and Engineering, Peking University, Beijing, China; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany. Institute for Environmental and Climate Research, Jinan University, Guangzhou, China; Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, China. Electronic address: byuan@jnu.edu.cn. Institute for Environmental and Climate Research, Jinan University, Guangzhou, China; Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, China. College of Environmental Sciences and Engineering, Peking University, Beijing, China. School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China. Institute for Environmental and Climate Research, Jinan University, Guangzhou, China; Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, China. Electronic address: eciwxm@jnu.edu.cn. Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany. Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany; Minerva Research Group, Max Planck Institute for Chemistry, Mainz, Germany"
Journal Title:		Sci Total Environ
Year:		2021
Volume:		20210518
Issue:
Page Number:		147712 -
DOI:		10.1016/j.scitotenv.2021.147712
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"In recent decade the ambient fine particle (PM(2.5)) levels have shown a trend of distinct dropping in China, while ground-level ozone concentrations have been increasing in Beijing and many other Chinese mega-cities. The variation pattern in Los Angeles was markedly different, with PM(2.5) and ozone decreasing together over past decades. In this study, we utilize observation-based methods to establish the parametric relationship between PM(2.5) concentration and key aerosol physical properties (including aerosol optical depth and aerosol surface concentration), and an observation-based 1-D photochemical model to quantify the response of PM(2.5) decline in enhancing ground-level ozone pollution over a large PM(2.5) concentration range (10-120 mug m(-3)). We find that the significance of ozone enhancement due to PM(2.5) dropping depends on both the PM(2.5) levels and optical properties of particles. Ozone formation increased by 37% in 2006-2016 due to PM(2.5) dropping in Beijing, while it becomes less important (7%) as PM(2.5) reaches below 40 mug/m(3), similar to Los Angeles since 1980s. Therefore, the two cities show the convergence of air pollutant characteristics. Hence a control strategy prioritizing reactive volatile organic compound abatement is projected to yield simultaneous ozone and PM(2.5) reductions in Beijing, as experienced in Los Angeles"
Keywords:		Ozone Pm(2.5) Pollution control Volatile organic compounds;
Notes:		"PubMed-not-MEDLINEShao, Min Wang, Wenjie Yuan, Bin Parrish, David D Li, Xin Lu, Keding Wu, Luolin Wang, Xuemei Mo, Ziwei Yang, Suxia Peng, Yuwen Kuang, Ye Chen, Weihua Hu, Min Zeng, Limin Su, Hang Cheng, Yafang Zheng, Junyu Zhang, Yuanhang eng Netherlands 2021/06/18 Sci Total Environ. 2021 Sep 20; 788:147712. doi: 10.1016/j.scitotenv.2021.147712. Epub 2021 May 18"