Geospatial View of Air Pollution and Health Risk over North Indian Region in COVID-19 Scenario
Abstract Air pollutant concentration, Air Quality Index (AQI) and Excess Risk (ER %) is assessed in three scenarios including pre-lockdown, lockdown and post-lockdown based on 47 ground station data (during January 2020 to June 2020) distributed over northern part of India using statistics and geographic information system (GIS) techniques. Significant decrease in pollutants concentration, AQI and ER % was observed in lockdown period amid COVID-19. PM2.5, PM10, NO2, NH3 and CO decreased by 46%, 31%, 39%, 24% and 34% respectively, in lockdown scenario as compared to the pre-lockdown scenario. A decrease of 39% in AQI was observed as compared to pre-lockdown scenario however the difference was less when compared with post-lockdown scenario. The decrease in total ER % was 60.36 % over the study area due to improvement in air quality amid COVID-19 lockdown. The meteorological conditions were found consistent in the current year with respect to previous year and very less influence was observed on the concentration of air pollutants. The major implications of the current findings are air pollution management, health risk management, and pollution source and type identification.