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Diurnal and temporal changes in air pollution during COVID-19 strict lockdown over different regions of India()

Lockdown measures to contain COVID-19 pandemic has resulted in a considerable change in air pollution worldwide. We estimate the temporal and diurnal changes of the six criteria air pollutants, including particulate matter (PM(2.5) and PM(10)) and gaseous pollutants (NO(2), O(3), CO, and SO(2)) duri...

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Autores principales: Singh, Vikas, Singh, Shweta, Biswal, Akash, Kesarkar, Amit P., Mor, Suman, Ravindra, Khaiwal
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier Ltd. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7426090/
https://www.ncbi.nlm.nih.gov/pubmed/32829030
http://dx.doi.org/10.1016/j.envpol.2020.115368
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author Singh, Vikas
Singh, Shweta
Biswal, Akash
Kesarkar, Amit P.
Mor, Suman
Ravindra, Khaiwal
author_facet Singh, Vikas
Singh, Shweta
Biswal, Akash
Kesarkar, Amit P.
Mor, Suman
Ravindra, Khaiwal
author_sort Singh, Vikas
collection PubMed
description Lockdown measures to contain COVID-19 pandemic has resulted in a considerable change in air pollution worldwide. We estimate the temporal and diurnal changes of the six criteria air pollutants, including particulate matter (PM(2.5) and PM(10)) and gaseous pollutants (NO(2), O(3), CO, and SO(2)) during lockdown (25(th) March – 3(rd) May 2020) across regions of India using the observations from 134 real-time monitoring sites of Central Pollution Control Board (CPCB). Significant reduction in PM(2.5), PM(10), NO(2,) and CO has been found in all the regions during the lockdown. SO(2) showed mixed behavior, with a slight increase at some sites but a comparatively significant decrease at other locations. O(3) also showed a mixed variation with a mild increase in IGP and a decrease in the South. The absolute decrease in PM(2.5), PM(10,) and NO(2) was observed during peak morning traffic hours (08–10 Hrs) and late evening (20–24 Hrs), but the percentage reduction is almost constant throughout the day. A significant decrease in day-time O(3) has been found over Indo Gangetic plain (IGP) and central India, whereas night-time O(3) has increased over IGP due to less O(3) loss. The most significant reduction (∼40–60%) was found in PM(2.5) and PM(10). The highest decrease in PM was found for the north-west and IGP followed by South and central regions. A considerable reduction (∼30–70%) in NO(2) was found except for a few sites in the central region. A similar pattern was observed for CO having a ∼20–40% reduction. The reduction observed for PM(2.5), PM(10), NO(2,) and enhancement in O(3) was proportional to the population density. Delhi’s air quality has improved with a significant reduction in primary pollutants, however, an increase in O(3) was observed. The changes reported during the lockdown are combined effect of changes in the emissions, meteorology, and atmospheric chemistry that requires detailed investigations.
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spelling pubmed-74260902020-08-14 Diurnal and temporal changes in air pollution during COVID-19 strict lockdown over different regions of India() Singh, Vikas Singh, Shweta Biswal, Akash Kesarkar, Amit P. Mor, Suman Ravindra, Khaiwal Environ Pollut Article Lockdown measures to contain COVID-19 pandemic has resulted in a considerable change in air pollution worldwide. We estimate the temporal and diurnal changes of the six criteria air pollutants, including particulate matter (PM(2.5) and PM(10)) and gaseous pollutants (NO(2), O(3), CO, and SO(2)) during lockdown (25(th) March – 3(rd) May 2020) across regions of India using the observations from 134 real-time monitoring sites of Central Pollution Control Board (CPCB). Significant reduction in PM(2.5), PM(10), NO(2,) and CO has been found in all the regions during the lockdown. SO(2) showed mixed behavior, with a slight increase at some sites but a comparatively significant decrease at other locations. O(3) also showed a mixed variation with a mild increase in IGP and a decrease in the South. The absolute decrease in PM(2.5), PM(10,) and NO(2) was observed during peak morning traffic hours (08–10 Hrs) and late evening (20–24 Hrs), but the percentage reduction is almost constant throughout the day. A significant decrease in day-time O(3) has been found over Indo Gangetic plain (IGP) and central India, whereas night-time O(3) has increased over IGP due to less O(3) loss. The most significant reduction (∼40–60%) was found in PM(2.5) and PM(10). The highest decrease in PM was found for the north-west and IGP followed by South and central regions. A considerable reduction (∼30–70%) in NO(2) was found except for a few sites in the central region. A similar pattern was observed for CO having a ∼20–40% reduction. The reduction observed for PM(2.5), PM(10), NO(2,) and enhancement in O(3) was proportional to the population density. Delhi’s air quality has improved with a significant reduction in primary pollutants, however, an increase in O(3) was observed. The changes reported during the lockdown are combined effect of changes in the emissions, meteorology, and atmospheric chemistry that requires detailed investigations. Elsevier Ltd. 2020-11 2020-08-13 /pmc/articles/PMC7426090/ /pubmed/32829030 http://dx.doi.org/10.1016/j.envpol.2020.115368 Text en © 2020 Elsevier Ltd. All rights reserved. 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
Singh, Vikas
Singh, Shweta
Biswal, Akash
Kesarkar, Amit P.
Mor, Suman
Ravindra, Khaiwal
Diurnal and temporal changes in air pollution during COVID-19 strict lockdown over different regions of India()
title Diurnal and temporal changes in air pollution during COVID-19 strict lockdown over different regions of India()
title_full Diurnal and temporal changes in air pollution during COVID-19 strict lockdown over different regions of India()
title_fullStr Diurnal and temporal changes in air pollution during COVID-19 strict lockdown over different regions of India()
title_full_unstemmed Diurnal and temporal changes in air pollution during COVID-19 strict lockdown over different regions of India()
title_short Diurnal and temporal changes in air pollution during COVID-19 strict lockdown over different regions of India()
title_sort diurnal and temporal changes in air pollution during covid-19 strict lockdown over different regions of india()
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7426090/
https://www.ncbi.nlm.nih.gov/pubmed/32829030
http://dx.doi.org/10.1016/j.envpol.2020.115368
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