首页|Variability of PM2.5 and O3 concentrations and their driving forces over Chinese megacities during 2018-2020

Variability of PM2.5 and O3 concentrations and their driving forces over Chinese megacities during 2018-2020

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Recently,air pollution especially fine particulate matters(PM2.5)and ozone(O3)has become a severe issue in China.In this study,we first characterized the temporal trends of PM2.5 and O3 for Beijing,Guangzhou,Shanghai,and Wuhan respectively during 2018-2020.The annual mean PM2.5 has decreased by 7.82％-33.92％,while O3 concentration showed insignificant variations by-6.77％-4.65％during 2018-2020.The generalized additive models(GAMs)were implemented to quantify the contribution of individual meteorological factors and their gas precursors on PM2.5 and O3.On a short-term perspective,GAMs modeling shows that the daily variability of PM2.5 concentration is largely related to the variation of precursor gases(R=0.67-0.90),while meteorological conditions mainly affect the daily variability of O3 concentration(R=0.65-0.80)during 2018-2020.The impact of COVID-19 lockdown on PM2.5 and O3 concentrations were also quantified by using GAMs.During the 2020 lockdown,PM2.5 decreased significantly for these megacities,yet the ozone concentration showed an increasing trend compared to 2019.The GAMs analysis indicated that the contribution of precursor gases to PM2.5 and O3 changes is 3-8 times higher than that of meteorological factors.In general,GAMs modeling on air quality is helpful to the understanding and control of PM2.5 and O3 pollution in China.

Air pollutionPM2.5 and O3 trendsMeteorologyCOVID-19 lockdown

Tianyi Xu、Chengxin Zhang、Cheng Liu、Qihou Hu

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School of Environmental Science and Optoelectronic Technology,University of Science and Technology of China,Hefei 230026,China

Key Laboratory of Environmental Optics and Technology,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China

Department of Precision Machinery and Precision Instrumentation,University of Science and Technology of China,Hefei 230026,China

Center for Excellence in Regional Atmospheric Environment,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China

Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes,Universi

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National Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaStrategic Priority Research Program of the Chinese Academy of SciencesMajor Projects of High Resolution Earth Observation Systems of National Science and TechnologyYouth Innovation Promotion Association of CASYoung Talent Project of the Center for Excellence in Regional Atmospheric Environment,CASChina Postdoctoral Science FoundationChina Postdoctoral Science FoundationAnhui Provincial Natural Science FoundationFundamental Research Funds for the Central Universities

2018YFC02131042017YFC0210002419771844194101151778596XDA2302030105-Y30B01-9001-19/20-32021443CERAE2020042020TQ03202021M6930682108085QD178

2023

环境科学学报(英文版)
中科院生态环境研究中心

环境科学学报(英文版)

CSTPCDCSCD北大核心SCI
影响因子：0.862
ISSN：1001-0742
年,卷(期)：2023.124(2)
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