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Chemistry of Atmospheric Fine Particles During the COVID‐19 Pandemic in a Megacity of Eastern China

Air pollution in megacities represents one of the greatest environmental challenges. Our observed results show that the dramatic NO(x) decrease (77%) led to significant O(3) increases (a factor of 2) during the COVID‐19 lockdown in megacity Hangzhou, China. Model simulations further demonstrate larg...

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Autores principales: Liu, Lei, Zhang, Jian, Du, Rongguang, Teng, Xiaomi, Hu, Rui, Yuan, Qi, Tang, Shanshan, Ren, Chuanhua, Huang, Xin, Xu, Liang, Zhang, Yinxiao, Zhang, Xiaoye, Song, Congbo, Liu, Bowen, Lu, Gongda, Shi, Zongbo, Li, Weijun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7883225/
https://www.ncbi.nlm.nih.gov/pubmed/33612876
http://dx.doi.org/10.1029/2020GL091611
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author Liu, Lei
Zhang, Jian
Du, Rongguang
Teng, Xiaomi
Hu, Rui
Yuan, Qi
Tang, Shanshan
Ren, Chuanhua
Huang, Xin
Xu, Liang
Zhang, Yinxiao
Zhang, Xiaoye
Song, Congbo
Liu, Bowen
Lu, Gongda
Shi, Zongbo
Li, Weijun
author_facet Liu, Lei
Zhang, Jian
Du, Rongguang
Teng, Xiaomi
Hu, Rui
Yuan, Qi
Tang, Shanshan
Ren, Chuanhua
Huang, Xin
Xu, Liang
Zhang, Yinxiao
Zhang, Xiaoye
Song, Congbo
Liu, Bowen
Lu, Gongda
Shi, Zongbo
Li, Weijun
author_sort Liu, Lei
collection PubMed
description Air pollution in megacities represents one of the greatest environmental challenges. Our observed results show that the dramatic NO(x) decrease (77%) led to significant O(3) increases (a factor of 2) during the COVID‐19 lockdown in megacity Hangzhou, China. Model simulations further demonstrate large increases of daytime OH and HO(2) radicals and nighttime NO(3) radical, which can promote the gas‐phase reaction and nocturnal multiphase chemistry. Therefore, enhanced NO(3) (−) and SO(4) (2−) formation was observed during the COVID‐19 lockdown because of the enhanced oxidizing capacity. The PM(2.5) decrease was only partially offset by enhanced aerosol formation with its reduction reaching 50%. In particular, NO(3) (−) decreased largely by 68%. PM(2.5) chemical analysis reveals that vehicular emissions mainly contributed to PM(2.5) under normal conditions in Hangzhou. Whereas, stationary sources dominated the residual PM(2.5) during the COVID‐19 lockdown. This study provides evidence that large reductions in vehicular emissions can effectively mitigate air pollution in megacities.
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spelling pubmed-78832252021-02-16 Chemistry of Atmospheric Fine Particles During the COVID‐19 Pandemic in a Megacity of Eastern China Liu, Lei Zhang, Jian Du, Rongguang Teng, Xiaomi Hu, Rui Yuan, Qi Tang, Shanshan Ren, Chuanhua Huang, Xin Xu, Liang Zhang, Yinxiao Zhang, Xiaoye Song, Congbo Liu, Bowen Lu, Gongda Shi, Zongbo Li, Weijun Geophys Res Lett Research Letter Air pollution in megacities represents one of the greatest environmental challenges. Our observed results show that the dramatic NO(x) decrease (77%) led to significant O(3) increases (a factor of 2) during the COVID‐19 lockdown in megacity Hangzhou, China. Model simulations further demonstrate large increases of daytime OH and HO(2) radicals and nighttime NO(3) radical, which can promote the gas‐phase reaction and nocturnal multiphase chemistry. Therefore, enhanced NO(3) (−) and SO(4) (2−) formation was observed during the COVID‐19 lockdown because of the enhanced oxidizing capacity. The PM(2.5) decrease was only partially offset by enhanced aerosol formation with its reduction reaching 50%. In particular, NO(3) (−) decreased largely by 68%. PM(2.5) chemical analysis reveals that vehicular emissions mainly contributed to PM(2.5) under normal conditions in Hangzhou. Whereas, stationary sources dominated the residual PM(2.5) during the COVID‐19 lockdown. This study provides evidence that large reductions in vehicular emissions can effectively mitigate air pollution in megacities. John Wiley and Sons Inc. 2021-01-18 2021-01-28 /pmc/articles/PMC7883225/ /pubmed/33612876 http://dx.doi.org/10.1029/2020GL091611 Text en © 2020. The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Letter
Liu, Lei
Zhang, Jian
Du, Rongguang
Teng, Xiaomi
Hu, Rui
Yuan, Qi
Tang, Shanshan
Ren, Chuanhua
Huang, Xin
Xu, Liang
Zhang, Yinxiao
Zhang, Xiaoye
Song, Congbo
Liu, Bowen
Lu, Gongda
Shi, Zongbo
Li, Weijun
Chemistry of Atmospheric Fine Particles During the COVID‐19 Pandemic in a Megacity of Eastern China
title Chemistry of Atmospheric Fine Particles During the COVID‐19 Pandemic in a Megacity of Eastern China
title_full Chemistry of Atmospheric Fine Particles During the COVID‐19 Pandemic in a Megacity of Eastern China
title_fullStr Chemistry of Atmospheric Fine Particles During the COVID‐19 Pandemic in a Megacity of Eastern China
title_full_unstemmed Chemistry of Atmospheric Fine Particles During the COVID‐19 Pandemic in a Megacity of Eastern China
title_short Chemistry of Atmospheric Fine Particles During the COVID‐19 Pandemic in a Megacity of Eastern China
title_sort chemistry of atmospheric fine particles during the covid‐19 pandemic in a megacity of eastern china
topic Research Letter
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7883225/
https://www.ncbi.nlm.nih.gov/pubmed/33612876
http://dx.doi.org/10.1029/2020GL091611
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