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Air Pollution plagues urbanised areas and enhances mankind’s vulnerability to the COVID-19 virus Background: According to W H O, Kolkata (India) ranks 25th amongst 1100 cities in the world Curbs on movement reduced this pollution during COVID-19 lockdown Resumption of activities nullified this Objectives: This study analyses the trend of air pollutants, their interrelationships with PM2 5, PM10, resultant National Air Quality Indices (NAQIs) before and after COVID-19 lockdowns in Kolkata Methods: Temporal trend analysis, PCA, multiple regressions and NAQIs were computed using pollutant data Results: SO2, NO2, CO, NH3, PM10 and PM2 5 witnessed drastic falls and rise through the pre-lockdown to lockdown and unlock phases, respectively NAQIs reduced by 74 55%, in the former phase, while in the next it reduced by 5 93% PM10 and PM2 5 |
