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Response of PM_(2.5)-bound elemental species to emission variations and associated health risk assessment during the covid-19 pandemic in a coastal megacity

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Journal of Environmental Sciences 2022年第12期34卷 115-127页

作者： Guochen Wang Kan Huang Qingyan Fu Jia Chen Juntao Huo Qianbiao Zhao Yusen Duan Yanfen Lin Fan Yang Wenjie Zhang Hao Li Jian Xu Xiaofei Qin Na Zhao Congrui Deng Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3) Department of Environmental Science and EngineeringFudan UniversityShanghai 200433China Shanghai Environmental Monitoring Center Shanghai 200030China Pudong New District Environmental Monitoring Station Shanghai 200122China Chinese Research Academy of Environmental Sciences Beijing 100012China IRDR ICoE on Risk Interconnectivity and Governance on Weather/Climate Extremes Impact and Public Health Fudan UniversityShanghai 200433China Institute of Eco-Chongming(IEC) Shanghai 202162China

The coronavirus(covid-19)pandemic is disrupting the world from many *** this study,the impact of emission variations on PM_(2.5)-bound elemental species and health risks associated to inhalation exposure has been analyzed based on real-time measurements at a remote coastal site in Shanghai during the *** trace elemental species decreased significantly and displayed almost no diel peaks during the *** the lockdown,they rebounded rapidly,of which V and Ni even exceeded the levels before the lockdown,suggesting the recovery of both inland and shipping *** sources were identified based on receptor *** combustion accounted for more than 70%of the measured elemental concentrations before and during the *** emissions,fugitive/mineral dust,and waste incineration all showed elevated contributions after the *** total non-carcinogenic risk(HQ)for the target elements exceeded the risk threshold for both children and adults with chloride as the predominant species contributing to ***,the total carcinogenic risk(TR)for adults was above the acceptable level and much higher than that for *** incineration was the largest contributor to HQ,while manufacture processing and coal combustion were the main sources of *** control measures were beneficial for lowering the carcinogenic risk while unexpectedly increased the non-carcinogenic *** the perspective of health effects,priorities of control measures should be given to waste incineration,manufacture processing,and coal combustion.A balanced way should be reached between both lowering the levels of air pollutants and their health risks.

关键词： covid-19 lockdown PM_(2.5)-bound elemental species Source apportionment Health risk Shanghai

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Response of organic aerosol characteristics to emission reduction in Yangtze River Delta region

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Frontiers of Environmental Science & Engineering 2023年第9期17卷 221-232页

作者： Jinbo Wang Jiaping Wang Wei Nie Xuguang Chi Dafeng Ge Caijun Zhu Lei Wang Yuanyuan Li Xin Huang Ximeng Qi Yuxuan Zhang Tengyu Liu Aijun Ding Joint International Research Laboratory of Atmospheric and Earth System Sciences School of Atmospheric SciencesNanjing UniversityNanjing 210023China Jiangsu Provincial Collaborative Innovation Center of Climate Change Nanjing 210023China National Observation and Research Station for Atmospheric Processes and Environmental Change in Yangtze River Delta Nanjing 210023China

Organic aerosol(OA)is a major component of atmospheric particulate matter(PM)with complex composition and formation processes influenced by various *** reduction can alter both precursors and oxidants which further affects secondary OA *** we provide an observational analysis of secondary OA(SOA)variation properties in Yangtze River Delta(YRD)of eastern China in response to large scale of emission reduction during Chinese New Year(CNY)holidays from 2015 to 2020,and the covid-19 pandemic period from January to March,*** found a 17%increase of SOA proportion during the covid *** relative enrichment of SOA is also found during multi-year CNY holidays with dramatic reduction of anthropogenic *** types of oxygenated OA(OOA)influenced by mixed emissions and SOA formation were found to be the dominant components during the lockdown in YRD *** results highlight that these emission-reduction-induced changes in organic aerosol need to be considered in the future to optimize air pollution control measures.

关键词： Emission control Secondary organic aerosol Atmospheric oxidizing capacity Holiday effects covid-19 lockdown

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Variability of PM_(2.5) and O_(3) concentrations and their driving forces over Chinese megacities during 2018-2020

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Journal of Environmental Sciences 2023年第2期124卷 1-10页

作者： Tianyi Xu Chengxin Zhang Cheng Liu Qihou Hu School of Environmental Science and Optoelectronic Technology University of Science and Technology of ChinaHefei 230026China Department of Precision Machinery and Precision Instrumentation University of Science and Technology of ChinaHefei 230026China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsChinese Academy of SciencesHefei 230031China Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes University of Science and Technology of ChinaHefei 230026China

Recently,air pollution especially fine particulate matters(PM_(2.5))and ozone(O_(3))has become a severe issue in *** this study,we first characterized the temporal trends of PM_(2.5) and O_(3) for Beijing,Guangzhou,Shanghai,andWuhan respectively during *** annual mean PM2.5 has decreased by 7.82%-33.92%,while O_(3) concentration showed insignificant variations by-6.77%-4.65%during *** generalized additive models(GAMs)were implemented to quantify the contribution of individual meteorological factors and their gas precursors on PM_(2.5) and O_(3).On a short-term perspective,GAMs modeling shows that the daily variability of PM_(2.5) concentration is largely related to the variation of precursor gases(R=0.67-0.90),while meteorological conditions mainly affect the daily variability of O_(3) concentration(R=0.65-0.80)during *** impact of covid-19 lockdown on PM_(2.5) and O_(3) concentrations were also quantified by using *** the 2020 lockdown,PM_(2.5) decreased significantly for these megacities,yet the ozone concentration showed an increasing trend compared to *** GAMs analysis indicated that the contribution of precursor gases to PM_(2.5) and O_(3) changes is 3-8 times higher than that of meteorological *** general,GAMsmodeling on air quality is helpful to the understanding and control of PM2.5 and O3 pollution in China.

关键词： Air pollution PM_(2.5)and O_(3)trends Meteorology covid-19 lockdown

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Global air quality change during the covid-19 pandemic:Regionally different ozone pollution responses covid-19

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Atmospheric and Oceanic Science Letters 2021年第4期14卷 45-51页

作者： Rong Tang Xin Huang Derong Zhou Haikun Wang Jiawei Xu Aijun Ding School of Atmospheric Sciences Nanjing UniversityNanjingChina Collaborative Innovation Center of Climate Change NanjingJiangsu ProvinceChina

The explosive spread of the 2019 novel coronavirus(covid-19)provides a unique chance to rethink the relationship between human activity and air *** related studies have revealed substantial reductions in primary emissions,obvious differences do exist in the responses of secondary pollutants,like ozone(0_(3))***,the regional disparities of O_(3)responses and their causes have still not been fully *** better elucidate the interrelationship between anthropogenic emissions,chemical production,and meteorological conditions,O_(3)responses caused by lockdowns over different regions were comprehensively explored at a global *** signals of air-quality change were derived from multi-year surface measurements and satellite *** similar substantial drops in nitrogen dioxide(NO_(2)),ozone shows rising signals in most areas of both East Asia and Europe,even up to~14 ppb,while a non-negligible declining signal exists in North America,by about 2-4 ***,the drivers behind the different O_(3)responses are discussed based on meteorological analysis and O_(3)sensitivity *** the one hand,O_(3)responses to NO_(2)declines can be affected by the primary dependence on its *** the other hand,it is also highly dependent on meteorological factors,especially *** study further highlights the great importance of taking into consideration both the regional disparities and synergistic effects of precursor reductions and meteorological influence for scientific mitigation of O_(3)pollution.

关键词： Air quality covid-19 lockdown Ozone Nitrogen dioxide Meteorology

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