Cargando…
Spatiotemporal variations and reduction of air pollutants during the COVID-19 pandemic in a megacity of Yangtze River Delta in China
In recent decades, air pollution has become an important environmental problem in the megacities of eastern China. How to control air pollution in megacities is still a challenging issue because of the complex pollutant sources, atmospheric chemistry, and meteorology. There is substantial uncertaint...
Autores principales: | , , , , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Published by Elsevier B.V.
2021
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7440035/ https://www.ncbi.nlm.nih.gov/pubmed/32861951 http://dx.doi.org/10.1016/j.scitotenv.2020.141820 |
_version_ | 1783573086234214400 |
---|---|
author | Yuan, Qi Qi, Bing Hu, Deyun Wang, Junjiao Zhang, Jian Yang, Huanqiang Zhang, Shanshan Liu, Lei Xu, Liang Li, Weijun |
author_facet | Yuan, Qi Qi, Bing Hu, Deyun Wang, Junjiao Zhang, Jian Yang, Huanqiang Zhang, Shanshan Liu, Lei Xu, Liang Li, Weijun |
author_sort | Yuan, Qi |
collection | PubMed |
description | In recent decades, air pollution has become an important environmental problem in the megacities of eastern China. How to control air pollution in megacities is still a challenging issue because of the complex pollutant sources, atmospheric chemistry, and meteorology. There is substantial uncertainty in accurately identifying the contributions of transport and local emissions to the air quality in megacities. The COVID-19 outbreak has prompted a nationwide public lockdown period and provides a valuable opportunity for understanding the sources and factors of air pollutants. The three-month period of continuous field observations for aerosol particles and gaseous pollutants, which extended from January 2020 to March 2020, covered urban, urban-industry, and suburban areas in the typical megacity of Hangzhou in the Yangtze River Delta in eastern China. In general, the concentrations of PM(2.5)(–)(10), PM(2.5), NO(x), SO(2), and CO reduced 58%, 47%, 83%, 11% and 30%, respectively, in the megacity during the COVID-Lock period. The reduction proportions of PM(2.5) and CO were generally higher in urban and urban-industry areas than those in suburban areas. NO(x) exhibited the greatest reduction (>80%) among all the air pollutants, and the reduction was similar in the urban, urban-industry, and suburban areas. O(3) increased 102%–125% during the COVID-Lock period. The daytime elevation of the planetary boundary layer height can reduce 30% of the PM(10), PM(2.5), NO(x) and CO concentrations on the ground in Hangzhou. During the long-range transport events, air pollutants on the regional scale likely contribute 40%–90% of the fine particles in the Hangzhou urban area. The findings highlight the future control and model forecasting of air pollutants in Hangzhou and similar megacities in eastern China. |
format | Online Article Text |
id | pubmed-7440035 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Published by Elsevier B.V. |
record_format | MEDLINE/PubMed |
spelling | pubmed-74400352020-08-21 Spatiotemporal variations and reduction of air pollutants during the COVID-19 pandemic in a megacity of Yangtze River Delta in China Yuan, Qi Qi, Bing Hu, Deyun Wang, Junjiao Zhang, Jian Yang, Huanqiang Zhang, Shanshan Liu, Lei Xu, Liang Li, Weijun Sci Total Environ Article In recent decades, air pollution has become an important environmental problem in the megacities of eastern China. How to control air pollution in megacities is still a challenging issue because of the complex pollutant sources, atmospheric chemistry, and meteorology. There is substantial uncertainty in accurately identifying the contributions of transport and local emissions to the air quality in megacities. The COVID-19 outbreak has prompted a nationwide public lockdown period and provides a valuable opportunity for understanding the sources and factors of air pollutants. The three-month period of continuous field observations for aerosol particles and gaseous pollutants, which extended from January 2020 to March 2020, covered urban, urban-industry, and suburban areas in the typical megacity of Hangzhou in the Yangtze River Delta in eastern China. In general, the concentrations of PM(2.5)(–)(10), PM(2.5), NO(x), SO(2), and CO reduced 58%, 47%, 83%, 11% and 30%, respectively, in the megacity during the COVID-Lock period. The reduction proportions of PM(2.5) and CO were generally higher in urban and urban-industry areas than those in suburban areas. NO(x) exhibited the greatest reduction (>80%) among all the air pollutants, and the reduction was similar in the urban, urban-industry, and suburban areas. O(3) increased 102%–125% during the COVID-Lock period. The daytime elevation of the planetary boundary layer height can reduce 30% of the PM(10), PM(2.5), NO(x) and CO concentrations on the ground in Hangzhou. During the long-range transport events, air pollutants on the regional scale likely contribute 40%–90% of the fine particles in the Hangzhou urban area. The findings highlight the future control and model forecasting of air pollutants in Hangzhou and similar megacities in eastern China. Published by Elsevier B.V. 2021-01-10 2020-08-20 /pmc/articles/PMC7440035/ /pubmed/32861951 http://dx.doi.org/10.1016/j.scitotenv.2020.141820 Text en © 2020 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 Yuan, Qi Qi, Bing Hu, Deyun Wang, Junjiao Zhang, Jian Yang, Huanqiang Zhang, Shanshan Liu, Lei Xu, Liang Li, Weijun Spatiotemporal variations and reduction of air pollutants during the COVID-19 pandemic in a megacity of Yangtze River Delta in China |
title | Spatiotemporal variations and reduction of air pollutants during the COVID-19 pandemic in a megacity of Yangtze River Delta in China |
title_full | Spatiotemporal variations and reduction of air pollutants during the COVID-19 pandemic in a megacity of Yangtze River Delta in China |
title_fullStr | Spatiotemporal variations and reduction of air pollutants during the COVID-19 pandemic in a megacity of Yangtze River Delta in China |
title_full_unstemmed | Spatiotemporal variations and reduction of air pollutants during the COVID-19 pandemic in a megacity of Yangtze River Delta in China |
title_short | Spatiotemporal variations and reduction of air pollutants during the COVID-19 pandemic in a megacity of Yangtze River Delta in China |
title_sort | spatiotemporal variations and reduction of air pollutants during the covid-19 pandemic in a megacity of yangtze river delta in china |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7440035/ https://www.ncbi.nlm.nih.gov/pubmed/32861951 http://dx.doi.org/10.1016/j.scitotenv.2020.141820 |
work_keys_str_mv | AT yuanqi spatiotemporalvariationsandreductionofairpollutantsduringthecovid19pandemicinamegacityofyangtzeriverdeltainchina AT qibing spatiotemporalvariationsandreductionofairpollutantsduringthecovid19pandemicinamegacityofyangtzeriverdeltainchina AT hudeyun spatiotemporalvariationsandreductionofairpollutantsduringthecovid19pandemicinamegacityofyangtzeriverdeltainchina AT wangjunjiao spatiotemporalvariationsandreductionofairpollutantsduringthecovid19pandemicinamegacityofyangtzeriverdeltainchina AT zhangjian spatiotemporalvariationsandreductionofairpollutantsduringthecovid19pandemicinamegacityofyangtzeriverdeltainchina AT yanghuanqiang spatiotemporalvariationsandreductionofairpollutantsduringthecovid19pandemicinamegacityofyangtzeriverdeltainchina AT zhangshanshan spatiotemporalvariationsandreductionofairpollutantsduringthecovid19pandemicinamegacityofyangtzeriverdeltainchina AT liulei spatiotemporalvariationsandreductionofairpollutantsduringthecovid19pandemicinamegacityofyangtzeriverdeltainchina AT xuliang spatiotemporalvariationsandreductionofairpollutantsduringthecovid19pandemicinamegacityofyangtzeriverdeltainchina AT liweijun spatiotemporalvariationsandreductionofairpollutantsduringthecovid19pandemicinamegacityofyangtzeriverdeltainchina |