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| Significant changes in the chemical compositions and sources of PM2.5 Wuhan since the city lockdown as COVID-19 | |
| Zheng, Huang1; Kong, Shaofei1,3; Yan, Yingying1,3; Cheng, Yi1; Zheng, Shurui1; Yao, Liquan1; Zheng, Mingming1,2; Fan, Zewei1; Qi, Shihua1,3; Chen, Nan2,3; Zhu, Bo2,3; Xu, Ke2,3; Cao, Wenxiang2,3; Ding, Qingqing2,3; Lan, Bo2,3; Zhang, Zhouxiang2,3; Liu, Dantong4; Bai, Yongqing5; Zhao, Tianliang6 | |
| 2020-10 | |
| 发表期刊 | SCIENCE OF THE TOTAL ENVIRONMENT
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| ISSN | 0048-9697 |
| EISSN | 1879-1026 |
| 摘要 | Wuhan was the first city to adopt the lockdown measures to prevent COVID-19 spreading, which improved the air quality accordingly. This study investigated the variations in chemical compositions, source contributions, and regional transport of fine particles (PM2.5) during January 23-February 22 of 2020, compared with the same period in 2019. The average mass concentration of PM2.5 decreased from 72.9 mu g m(-3) (2019) to 45.9 mu g m(-3) (2020), by 27.0 mu g m(-3). It was predominantly contributed by the emission reduction (92.0%), retrieved from a random forest tree approach. The main chemical species of PM2.5 all decreased with the reductions ranging from 0.85 mu g m(-3) (chloride) to 9.86 mu g m(-3) (nitrate) (p < 0.01). Positive matrix factorization model indicated that the mass contributions of seven PM2.5 sources all decreased. However, their contribution percentages varied from -11.0% (industrial processes) to 8.70% (secondary inorganic aerosol). Source contributions of PM(2.5 )transported from potential geographical regions showed reductions with mean values ranging from 0.22 to 436 mu g m(-3). However, increased contributions of firework burning, secondary inorganic aerosol, road dust, and vehicle emissions from transboundary transport were observed. This study highlighted the complex and nonlinear response of chemical compositions and sources of PM2.5 to air pollution control measures, suggesting the importance of regional-joint control. (C) 2020 Elsevier B.V. All rights reserved. |
| 关键词 | COVID-2019 Fine particle Chemical composition Source apportionment Random forest tree Regional transportation |
| DOI | 10.1016/j.scitotenv.2020.140000 |
| WOS关键词 | CHINA SOURCE APPORTIONMENT ; BIOMASS BURNING EMISSIONS ; FINE PARTICULATE MATTER ; AIR-QUALITY ; METEOROLOGICAL CONDITIONS ; TRACE-ELEMENTS ; BLACK CARBON ; ANTHROPOGENIC EMISSIONS ; REGIONAL TRANSPORT ; BACKGROUND SITE |
| WOS研究方向 | Environmental Sciences & Ecology |
| WOS类目 | Environmental Sciences |
| 出版者 | ELSEVIER |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 专题 | 新冠肺炎 循证社会科学证据集成 |
| 作者单位 | 1.China Univ Geosci; 2.Ecoenvironm Monitoring Ctr Hubei Prov; 3.Res Ctr Complex Air Pollut Hubei Prov; 4.Zhejiang Univ; 5.China Meteorol Adm; 6.Nanjing Univ Informat Sci & Technol |
| 推荐引用方式 GB/T 7714 | Zheng, Huang,Kong, Shaofei,Yan, Yingying,et al. Significant changes in the chemical compositions and sources of PM2.5 Wuhan since the city lockdown as COVID-19[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020. |
| APA | Zheng, Huang.,Kong, Shaofei.,Yan, Yingying.,Cheng, Yi.,Zheng, Shurui.,...&Zhao, Tianliang.(2020).Significant changes in the chemical compositions and sources of PM2.5 Wuhan since the city lockdown as COVID-19.SCIENCE OF THE TOTAL ENVIRONMENT. |
| MLA | Zheng, Huang,et al."Significant changes in the chemical compositions and sources of PM2.5 Wuhan since the city lockdown as COVID-19".SCIENCE OF THE TOTAL ENVIRONMENT (2020). |
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