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DOI	10.1016/j.envpol.2020.114694
	PM2.5 and O-3 pollution during 2015-2019 over 367 Chinese cities: Spatiotemporal variations, meteorological and topographical impacts
	Zhao, Suping; Yin, Daiying; Yu, Ye; Kang, Shichang; Qin, Dahe; Dong, Longxiang
发表日期	2020
ISSN	0269-7491
卷号	264
英文摘要	The strict Clean Air Action Plan has been in place by central and local government in China since 2013 to alleviate haze pollution. In response to implementation of the Plan, daytime PM2.5 (particulate matter with aerodynamic diameter less than 2.5 um) showed significant downward trends from 2015 to 2019, with the largest reduction during spring and winter in the North China Plain. Unlike PM2.5, O-3 (ozone) showed a general increasing trend, reaching 29.7 mu g m(-3) on summer afternoons. Increased O-3 and reduced PM2.5 simultaneously occurred in more than half of Chinese cities, increasing to approximately three-fourths in summer. Declining trends in both PM2.5 and O-3 occurred in only a few cities, varying from 19.1% of cities in summer to 33.7% in fall. Meteorological variables helped to decrease PM2.5 and O-3 in some cities and increase PM2.5 and O-3 in others, which is closely related to terrain. High wind speed and 24 h changing pressure favored PM2.5 dispersion and dilution, especially in winter in southern China. However, O-3 was mainly affected by 24 h maximum temperature over most cities. Soil temperature was found to be a key factor modulating air pollution. Its impact on PM2.5 concentrations depended largely on soil depth and seasons; spring and fall soil temperature at 80 cm below the surface had largely negative impacts. Compared with PM2.5, O-3 was more significantly affected by soil temperature, with the largest impact at 20 cm below the surface and with less seasonal variation. (C) 2020 Elsevier Ltd. All rights reserved.
英文关键词	Fine particles; Air quality; Soil temperature; Complex terrain
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
来源期刊	ENVIRONMENTAL POLLUTION
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158822
作者单位	Zhao, SP (corresponding author), Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Land Surface Proc & Climate Change Cold &, Lanzhou 730000, Peoples R China.
推荐引用方式 GB/T 7714	Zhao, Suping,Yin, Daiying,Yu, Ye,et al. PM2.5 and O-3 pollution during 2015-2019 over 367 Chinese cities: Spatiotemporal variations, meteorological and topographical impacts[J],2020,264.
APA	Zhao, Suping,Yin, Daiying,Yu, Ye,Kang, Shichang,Qin, Dahe,&Dong, Longxiang.(2020).PM2.5 and O-3 pollution during 2015-2019 over 367 Chinese cities: Spatiotemporal variations, meteorological and topographical impacts.ENVIRONMENTAL POLLUTION,264.
MLA	Zhao, Suping,et al."PM2.5 and O-3 pollution during 2015-2019 over 367 Chinese cities: Spatiotemporal variations, meteorological and topographical impacts".ENVIRONMENTAL POLLUTION 264(2020).