Effect of COVID-19-induced lockdown on NO₂ pollution using TROPOMI and ground-based CPCB observations in Delhi NCR, India.

ABSTRACT: The present study investigates the reduction in nitrogen dioxide (NO₂) levels using satellite-based (Sentinel-5P TROPOMI) and ground-based (Central Pollution Control Board) observations of 2020. The lockdown duration, monthly, seasonal and annual changes in NO₂ were assessed comparing the similar time period in 2019. The study also examines the role of atmospheric parameters like wind speed, air temperature, relative humidity, solar radiation and atmospheric pressure in altering the monthly and annual values of the pollutant. It was ascertained that there was a mean reduction of ~ 61% (~ 66.5%), ~ 58% (~ 51%) in daily mean NO₂ pollution during lockdown phase 1 when compared with similar period of 2019 and pre-lockdown phase in 2020 from ground-based (satell

SUBMITTER: Siddiqui A 

PROVIDER: S-EPMC9428889 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature