Short-term impacts of air pollutants in three megacities of India during COVID-19 lockdown
- 23 April 2021
- journal article
- research article
- Published by Springer Science and Business Media LLC in Environment, Development and Sustainability
- Vol. 23 (12), 18204-18231
- https://doi.org/10.1007/s10668-021-01434-9
Abstract
Lockdown was imposed by the Indian government in the month of March 2020 as an early precaution to the COVID-19 pandemic which obstructed the socio-economic growth globally. The main aim of this study was to analyse the impact of lockdown (imposed in March and continued in April 2020) on the existing air quality in three megacities of India (Delhi, Mumbai and Kolkata) by assessing the trends of PM10 and NO2 concentrations. A comparison of the percentage reduction in concentrations of lockdown period with respect to same period in year 2019 and pre-lockdown period (February 14–March 24) was made. It was observed from the study that an overall decrease of pollutant concentrations was in the ranges of 30–60% and 52–80% of PM10 and NO2, respectively, in the three cities during lockdown in comparison with previous year and pre-lockdown period. The overall decrease in concentrations of pollutants at urban sites was greater than the background sites. Highest decline in concentrations of PM10 were observed in Kolkata city, followed by Mumbai and Delhi, while decline in NO2 was highest in Mumbai. Results also highlighted that capital city Delhi had the worst air quality amongst three cities, with particulate matter (PM10) being the dominant pollutant. Although COVID-19 has significantly affected the human life considering the mortality and morbidity, lockdowns imposed to control the pandemic had significantly improved the air quality in the selected study locations, although for the short amount of period.Keywords
This publication has 77 references indexed in Scilit:
- Urban forests and pollution mitigation: Analyzing ecosystem services and disservicesEnvironmental Pollution, 2011
- Preliminary Estimates of Nanoparticle Number Emissions from Road Vehicles in Megacity Delhi and Associated Health ImpactsEnvironmental Science & Technology, 2011
- Acute effects of air pollution on pediatric asthma exacerbation: Evidence of association and effect modificationEnvironmental Research, 2011
- Air Pollution in Kolkata: An Analysis of Current Status and Interrelation between Different FactorsSouth East European University Review, 2011
- Human health risks in megacities due to air pollutionAtmospheric Environment, 2010
- Analysis and interpretation of particulate matter – PM10, PM2.5 and PM1 emissions from the heterogeneous traffic near an urban roadwayAtmospheric Pollution Research, 2010
- Megacities – megarisksNatural Hazards, 2007
- Epidemiological evidence of effects of coarse airborne particles on healthEuropean Respiratory Journal, 2005
- Source apportionment of fine and coarse particulate matter in a sub-urban area at the Western European CoastAtmospheric Environment, 2005
- An Association between Air Pollution and Mortality in Six U.S. CitiesThe New England Journal of Medicine, 1993