Knowledge Management System Of Institute of Earth Environment, CAS
| Impacts of primary emissions and secondary aerosol formation on air pollution in an urban area of China during the COVID-19 lockdown | |
| Tian, Jie1,2,3; Wang, Qiyuan1,2,3; Zhang, Yong1; Yan, Mengyuan4; Liu, Huikun1; Zhang, Ningning1; Ran, Weikang1; Cao, Junji1,2,3 | |
| Corresponding Author | Wang, Qiyuan(wangqy@ieecas.cn) ; Cao, Junji(cao@loess.llqg.ac.cn) |
| 2021-05-01 | |
| Source Publication | ENVIRONMENT INTERNATIONAL
 |
| ISSN | 0160-4120 |
| Volume | 150Pages:14 |
| Abstract | Restrictions on human activities were implemented in China to cope with the outbreak of the Coronavirus Disease 2019 (COVID-19), providing an opportunity to investigate the impacts of anthropogenic emissions on air quality. Intensive real-time measurements were made to compare primary emissions and secondary aerosol formation in Xi?an, China before and during the COVID-19 lockdown. Decreases in mass concentrations of particulate matter (PM) and its components were observed during the lockdown with reductions of 32-51%. The dominant contributor of PM was organic aerosol (OA), and results of a hybrid environmental receptor model indicated OA was composed of four primary OA (POA) factors (hydrocarbon-like OA (HOA), cooking OA (COA), biomass burning OA (BBOA), and coal combustion OA (CCOA)) and two oxygenated OA (OOA) factors (less oxidized OOA (LO-OOA) and more-oxidized OOA (MO-OOA)). The mass concentrations of OA factors decreased from before to during the lockdown over a range of 17% to 58%, and they were affected by control measures and secondary processes. Correlations of secondary aerosols/Delta CO with Ox (NO2 + O-3) and aerosol liquid water content indicated that photochemical oxidation had a greater effect on the formation of nitrate and two OOAs than sulfate; however, aqueous-phase reaction presented a more complex effect on secondary aerosols formation at different relative humidity condition. The formation efficiencies of secondary aerosols were enhanced during the lockdown as the increase of atmospheric oxidation capacity. Analyses of pollution episodes highlighted the importance of OA, especially the LO-OOA, for air pollution during the lockdown. |
| Keyword | COVID-19 Submicron aerosol Source apportionment Secondary formation |
| DOI | 10.1016/j.envint.2021.106426 |
| WOS Keyword | RESOLVED CHEMICAL-CHARACTERIZATION ; POSITIVE MATRIX FACTORIZATION ; PRIMARY ORGANIC AEROSOL ; YANGTZE-RIVER DELTA ; SOURCE APPORTIONMENT ; MASS-SPECTROMETER ; SEASONAL-VARIATIONS ; PARTICULATE MATTER ; SUBMICRON AEROSOLS ; AQUEOUS-PHASE |
| Indexed By | SCI ; SCI |
| Language | 英语 |
| Funding Project | Key Research and Development Program of Shaanxi Province[2018-ZDXM3-01] ; Sino-Swiss Cooperation on Air Pollution for Better Air[7F-09802.01.02] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2019402] ; National Natural Science Foundation of China[NSFC 21661132005] ; West Light Foundation of the Chinese Academy of Sciences[XAB2019B05] ; National Atmospheric Research Program[2017YFC0212200] ; Key Deployment Program of the Chinese Academy of Sciences[ZDRW-ZS-2017-6] |
| WOS Research Area | Environmental Sciences & Ecology |
| Funding Organization | Key Research and Development Program of Shaanxi Province ; Sino-Swiss Cooperation on Air Pollution for Better Air ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; West Light Foundation of the Chinese Academy of Sciences ; National Atmospheric Research Program ; Key Deployment Program of the Chinese Academy of Sciences |
| WOS Subject | Environmental Sciences |
| WOS ID | WOS:000626346000007 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ieecas.cn/handle/361006/16171 |
| Collection | 黄土与第四纪地质国家重点实验室（2010~） 第四纪科学与全球变化卓越创新中心 |
| Corresponding Author | Wang, Qiyuan; Cao, Junji |
| Affiliation | 1.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China 2.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China 3.Shaanxi Key Lab Atmospher & Haze Fog Pollut Preve, Xian 710061, Peoples R China 4.Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Xian 710049, Peoples R China |
| Recommended Citation GB/T 7714 | Tian, Jie,Wang, Qiyuan,Zhang, Yong,et al. Impacts of primary emissions and secondary aerosol formation on air pollution in an urban area of China during the COVID-19 lockdown[J]. ENVIRONMENT INTERNATIONAL,2021,150:14. |
| APA | Tian, Jie.,Wang, Qiyuan.,Zhang, Yong.,Yan, Mengyuan.,Liu, Huikun.,...&Cao, Junji.(2021).Impacts of primary emissions and secondary aerosol formation on air pollution in an urban area of China during the COVID-19 lockdown.ENVIRONMENT INTERNATIONAL,150,14. |
| MLA | Tian, Jie,et al."Impacts of primary emissions and secondary aerosol formation on air pollution in an urban area of China during the COVID-19 lockdown".ENVIRONMENT INTERNATIONAL 150(2021):14. |
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