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Effect of lockdown amid COVID-19 pandemic on air quality of the megacity Delhi, India.
Sci Total Environ. 2020 Aug 15; 730:139086.ST

Abstract

Amid the COVID-19 pandemic, a nationwide lockdown is imposed in India initially for three weeks from 24th March to 14th April 2020 and extended up to 3rd May 2020. Due to the forced restrictions, pollution level in cities across the country drastically slowed down just within few days which magnetize discussions regarding lockdown to be the effectual alternative measures to be implemented for controlling air pollution. The present article eventually worked on this direction to look upon the air quality scenario amidst the lockdown period scientifically with special reference to the megacity Delhi. With the aid of air quality data of seven pollutant parameters (PM10, PM2.5, SO2, NO2, CO, O3 and NH3) for 34 monitoring stations spread over the megacity we have employed National Air Quality Index (NAQI) to show the spatial pattern of air quality in pre and during-lockdown phases. The results demonstrated that during lockdown air quality is significantly improved. Among the selected pollutants, concentrations of PM10 and PM2.5 have witnessed maximum reduction (>50%) in compare to the pre-lockdown phase. In compare to the last year (i.e. 2019) during the said time period the reduction of PM10 and PM2.5 is as high as about 60% and 39% respectively. Among other pollutants, NO2 (-52.68%) and CO (-30.35%) level have also reduced during-lockdown phase. About 40% to 50% improvement in air quality is identified just after four days of commencing lockdown. About 54%, 49%, 43%, 37% and 31% reduction in NAQI have been observed in Central, Eastern, Southern, Western and Northern parts of the megacity. Overall, the study is thought to be a useful supplement to the regulatory bodies since it showed the pollution source control can attenuate the air quality. Temporary such source control in a suitable time interval may heal the environment.

Authors+Show Affiliations

Department of Geography, University of Gour Banga, West Bengal, India; Department of Geography, Presidency University, West Bengal, India. Electronic address: mahatosusanta2011@gmail.com.Department of Geography, University of Gour Banga, West Bengal, India; Department of Geography, Presidency University, West Bengal, India. Electronic address: swadeshpal82@gmail.com.Department of Geography, University of Gour Banga, West Bengal, India; Department of Geography, Presidency University, West Bengal, India. Electronic address: krishna.geog@presiuniv.ac.in.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32375105

Citation

Mahato, Susanta, et al. "Effect of Lockdown Amid COVID-19 Pandemic On Air Quality of the Megacity Delhi, India." The Science of the Total Environment, vol. 730, 2020, p. 139086.
Mahato S, Pal S, Ghosh KG. Effect of lockdown amid COVID-19 pandemic on air quality of the megacity Delhi, India. Sci Total Environ. 2020;730:139086.
Mahato, S., Pal, S., & Ghosh, K. G. (2020). Effect of lockdown amid COVID-19 pandemic on air quality of the megacity Delhi, India. The Science of the Total Environment, 730, 139086. https://doi.org/10.1016/j.scitotenv.2020.139086
Mahato S, Pal S, Ghosh KG. Effect of Lockdown Amid COVID-19 Pandemic On Air Quality of the Megacity Delhi, India. Sci Total Environ. 2020 Aug 15;730:139086. PubMed PMID: 32375105.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of lockdown amid COVID-19 pandemic on air quality of the megacity Delhi, India. AU - Mahato,Susanta, AU - Pal,Swades, AU - Ghosh,Krishna Gopal, Y1 - 2020/04/29/ PY - 2020/04/25/received PY - 2020/04/26/revised PY - 2020/04/27/accepted PY - 2020/5/7/pubmed PY - 2020/6/4/medline PY - 2020/5/7/entrez KW - Change of air quality KW - Covid-19 KW - Lockdown KW - Megacity Delhi KW - National Air quality Index SP - 139086 EP - 139086 JF - The Science of the total environment JO - Sci Total Environ VL - 730 N2 - Amid the COVID-19 pandemic, a nationwide lockdown is imposed in India initially for three weeks from 24th March to 14th April 2020 and extended up to 3rd May 2020. Due to the forced restrictions, pollution level in cities across the country drastically slowed down just within few days which magnetize discussions regarding lockdown to be the effectual alternative measures to be implemented for controlling air pollution. The present article eventually worked on this direction to look upon the air quality scenario amidst the lockdown period scientifically with special reference to the megacity Delhi. With the aid of air quality data of seven pollutant parameters (PM10, PM2.5, SO2, NO2, CO, O3 and NH3) for 34 monitoring stations spread over the megacity we have employed National Air Quality Index (NAQI) to show the spatial pattern of air quality in pre and during-lockdown phases. The results demonstrated that during lockdown air quality is significantly improved. Among the selected pollutants, concentrations of PM10 and PM2.5 have witnessed maximum reduction (>50%) in compare to the pre-lockdown phase. In compare to the last year (i.e. 2019) during the said time period the reduction of PM10 and PM2.5 is as high as about 60% and 39% respectively. Among other pollutants, NO2 (-52.68%) and CO (-30.35%) level have also reduced during-lockdown phase. About 40% to 50% improvement in air quality is identified just after four days of commencing lockdown. About 54%, 49%, 43%, 37% and 31% reduction in NAQI have been observed in Central, Eastern, Southern, Western and Northern parts of the megacity. Overall, the study is thought to be a useful supplement to the regulatory bodies since it showed the pollution source control can attenuate the air quality. Temporary such source control in a suitable time interval may heal the environment. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/32375105/Effect_of_lockdown_amid_COVID_19_pandemic_on_air_quality_of_the_megacity_Delhi_India_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(20)32603-6 DB - PRIME DP - Unbound Medicine ER -