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Characterization of the aerosol chemical composition during the COVID-19 lockdown period in Suzhou in the Yangtze River Delta, China

To control the spread of COVID-19, rigorous restrictions have been implemented in China, resulting in a great reduction in pollutant emissions. In this study, we evaluated the air quality in the Yangtze River Delta during the COVID-19 lockdown period using satellite and ground-based data, including...

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Autores principales: Wang, Honglei, Miao, Qing, Shen, Lijuan, Yang, Qian, Wu, Yezheng, Wei, Heng, Yin, Yan, Zhao, Tianliang, Zhu, Bin, Lu, Wen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7508540/
https://www.ncbi.nlm.nih.gov/pubmed/33637237
http://dx.doi.org/10.1016/j.jes.2020.09.019
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author Wang, Honglei
Miao, Qing
Shen, Lijuan
Yang, Qian
Wu, Yezheng
Wei, Heng
Yin, Yan
Zhao, Tianliang
Zhu, Bin
Lu, Wen
author_facet Wang, Honglei
Miao, Qing
Shen, Lijuan
Yang, Qian
Wu, Yezheng
Wei, Heng
Yin, Yan
Zhao, Tianliang
Zhu, Bin
Lu, Wen
author_sort Wang, Honglei
collection PubMed
description To control the spread of COVID-19, rigorous restrictions have been implemented in China, resulting in a great reduction in pollutant emissions. In this study, we evaluated the air quality in the Yangtze River Delta during the COVID-19 lockdown period using satellite and ground-based data, including particle matter (PM), trace gases, water-soluble ions (WSIs) and black carbon (BC). We found that the impacts of lockdown policy on air quality cannot be accurately assessed using MODIS aerosol optical depth (AOD) data, whereas the tropospheric nitrogen dioxide (NO(2)) vertical column density can well reflect the influences of these restrictions on human activities. Compared to the pre-COVID period, the PM(2.5), PM(10), NO(2), carbon monoxide (CO), BC and WSIs during the lockdown in Suzhou were observed to decrease by 37.2%, 38.3%, 64.5%, 26.1%, 53.3% and 58.6%, respectively, while the sulfur dioxide (SO(2)) and ozone (O(3)) increased by 1.5% and 104.7%. The WSIs ranked in the order of NO(3)(−) > NH(4)(+) > SO(4)(2-) > Cl(−) > Ca(2+) > K(+) > Mg(2+) > Na(+) during the lockdown period. By comparisons with the ion concentrations during the pre-COVID period, we found that the ions NO(3)(−), NH(4)(+), SO(4)(2−), Cl(−), Ca(2+), K(+) and Na(+) decreased by 66.3%, 48.8%, 52.9%, 56.9%, 57.9% and 76.3%, respectively, during the lockdown, in contrast to Mg(2+), which increased by 30.2%. The lockdown policy was found to have great impacts on the diurnal variations of Cl(−), SO(4)(2−), Na(+) and Ca(2+).
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spelling pubmed-75085402020-09-23 Characterization of the aerosol chemical composition during the COVID-19 lockdown period in Suzhou in the Yangtze River Delta, China Wang, Honglei Miao, Qing Shen, Lijuan Yang, Qian Wu, Yezheng Wei, Heng Yin, Yan Zhao, Tianliang Zhu, Bin Lu, Wen J Environ Sci (China) Article To control the spread of COVID-19, rigorous restrictions have been implemented in China, resulting in a great reduction in pollutant emissions. In this study, we evaluated the air quality in the Yangtze River Delta during the COVID-19 lockdown period using satellite and ground-based data, including particle matter (PM), trace gases, water-soluble ions (WSIs) and black carbon (BC). We found that the impacts of lockdown policy on air quality cannot be accurately assessed using MODIS aerosol optical depth (AOD) data, whereas the tropospheric nitrogen dioxide (NO(2)) vertical column density can well reflect the influences of these restrictions on human activities. Compared to the pre-COVID period, the PM(2.5), PM(10), NO(2), carbon monoxide (CO), BC and WSIs during the lockdown in Suzhou were observed to decrease by 37.2%, 38.3%, 64.5%, 26.1%, 53.3% and 58.6%, respectively, while the sulfur dioxide (SO(2)) and ozone (O(3)) increased by 1.5% and 104.7%. The WSIs ranked in the order of NO(3)(−) > NH(4)(+) > SO(4)(2-) > Cl(−) > Ca(2+) > K(+) > Mg(2+) > Na(+) during the lockdown period. By comparisons with the ion concentrations during the pre-COVID period, we found that the ions NO(3)(−), NH(4)(+), SO(4)(2−), Cl(−), Ca(2+), K(+) and Na(+) decreased by 66.3%, 48.8%, 52.9%, 56.9%, 57.9% and 76.3%, respectively, during the lockdown, in contrast to Mg(2+), which increased by 30.2%. The lockdown policy was found to have great impacts on the diurnal variations of Cl(−), SO(4)(2−), Na(+) and Ca(2+). The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. 2021-04 2020-09-22 /pmc/articles/PMC7508540/ /pubmed/33637237 http://dx.doi.org/10.1016/j.jes.2020.09.019 Text en © 2020 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.
spellingShingle Article
Wang, Honglei
Miao, Qing
Shen, Lijuan
Yang, Qian
Wu, Yezheng
Wei, Heng
Yin, Yan
Zhao, Tianliang
Zhu, Bin
Lu, Wen
Characterization of the aerosol chemical composition during the COVID-19 lockdown period in Suzhou in the Yangtze River Delta, China
title Characterization of the aerosol chemical composition during the COVID-19 lockdown period in Suzhou in the Yangtze River Delta, China
title_full Characterization of the aerosol chemical composition during the COVID-19 lockdown period in Suzhou in the Yangtze River Delta, China
title_fullStr Characterization of the aerosol chemical composition during the COVID-19 lockdown period in Suzhou in the Yangtze River Delta, China
title_full_unstemmed Characterization of the aerosol chemical composition during the COVID-19 lockdown period in Suzhou in the Yangtze River Delta, China
title_short Characterization of the aerosol chemical composition during the COVID-19 lockdown period in Suzhou in the Yangtze River Delta, China
title_sort characterization of the aerosol chemical composition during the covid-19 lockdown period in suzhou in the yangtze river delta, china
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7508540/
https://www.ncbi.nlm.nih.gov/pubmed/33637237
http://dx.doi.org/10.1016/j.jes.2020.09.019
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