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Natl Sci Rev

Title:		Contrasting trends of PM(2.5) and surface-ozone concentrations in China from 2013 to 2017
Author(s):		Wang Y; Gao W; Wang S; Song T; Gong Z; Ji D; Wang L; Liu Z; Tang G; Huo Y; Tian S; Li J; Li M; Yang Y; Chu B; Petaja T; Kerminen VM; He H; Hao J; Kulmala M; Wang Y; Zhang Y;
Address:		"State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China. China National Environmental Monitoring Center (CNEMC), Beijing 100012, China. Anhui Institute of Meteorological Sciences, Hefei 230031, China. Institute for Atmospheric and Earth System Research, University of Helsinki, Helsinki 00014, Finland. State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China"
Journal Title:		Natl Sci Rev
Year:		2020
Volume:		20200228
Issue:		8
Page Number:		1331 - 1339
DOI:		10.1093/nsr/nwaa032
ISSN/ISBN:		2053-714X (Electronic) 2095-5138 (Print) 2053-714X (Linking)
Abstract:		"Although much attention has been paid to investigating and controlling air pollution in China, the trends of air-pollutant concentrations on a national scale have remained unclear. Here, we quantitatively investigated the variation of air pollutants in China using long-term comprehensive data sets from 2013 to 2017, during which Chinese government made major efforts to reduce anthropogenic emission in polluted regions. Our results show a significant decreasing trend in the PM(2.5) concentration in heavily polluted regions of eastern China, with an annual decrease of approximately 7% compared with measurements in 2013. The measured decreased concentrations of SO(2), NO(2) and CO (a proxy for anthropogenic volatile organic compounds) could explain a large fraction of the decreased PM(2.5) concentrations in different regions. As a consequence, the heavily polluted days decreased significantly in corresponding regions. Concentrations of organic aerosol, nitrate, sulfate, ammonium and chloride measured in urban Beijing revealed a remarkable reduction from 2013 to 2017, connecting the decreases in aerosol precursors with corresponding chemical components closely. However, surface-ozone concentrations showed increasing trends in most urban stations from 2013 to 2017, which indicates stronger photochemical pollution. The boundary-layer height in capital cities of eastern China showed no significant trends over the Beijing-Tianjin-Hebei, Yangtze River Delta and Pearl River Delta regions from 2013 to 2017, which confirmed the reduction in anthropogenic emissions. Our results demonstrated that the Chinese government was successful in the reduction of particulate matter in urban areas from 2013 to 2017, although the ozone concentration has increased significantly, suggesting a more complex mechanism of improving Chinese air quality in the future"
Keywords:		China air pollution chemical composition clean-air action particulate matter surface ozone;
Notes:		"PubMed-not-MEDLINEWang, Yonghong Gao, Wenkang Wang, Shuai Song, Tao Gong, Zhengyu Ji, Dongsheng Wang, Lili Liu, Zirui Tang, Guiqian Huo, Yanfeng Tian, Shili Li, Jiayun Li, Mingge Yang, Yuan Chu, Biwu Petaja, Tuukka Kerminen, Veli-Matti He, Hong Hao, Jiming Kulmala, Markku Wang, Yuesi Zhang, Yuanhang eng China 2020/08/01 Natl Sci Rev. 2020 Aug; 7(8):1331-1339. doi: 10.1093/nsr/nwaa032. Epub 2020 Feb 28"