Comparative analysis of particulate matter (PM2.5, PM10) and trace gases (SO2, NO2, O3) in between satellite derived data and ground based instruments

Abstract

The present 12 weeks (4 October 2021 to 26 December 2021) study emphasizes on examining the various air quality parameters i.e. PM2.5, PM10, SO2, NO2 and O3 over four different sampling stations i.e. Dwarka (28°32' ,28°38' N ,77°0' ,78°8' E) Knowledge Park III (29.496152°N, 77.536011°E), Sector125 (28.5438° N, 77.3310° E) and Vivek Vihar (28.6712° N, 77.3177° E) using ground-based instruments and satellite remote sensing observation (MERRA-2, OMI and Aura Satellite). The ground based observation shows the mean concentrations of PM2.5 in Dwarka, Knowledge park III, Sector 125, and Vivek Vihar as 279 µg m-3, 274 µg m-3, 294 µg m-3, and 365 µg m-3 respectively. The ground based instrumental concentrations of PM2.5 and O3 were higher than the satellite observations, while as for SO2 and NO2, the mean concentration of satellite based monitoring was higher as compared to others pollutants. A very strong correlations were observed among PM2.5, PM10, SO2, NO2 and O3. A negative and positive weak correlation were observed among pollutant and various meteorological parameters. It has been observed that the wind direction is one of the most prominent parameter to alter the variation of these pollutants. Overall, the present study provides an insight into the noticeable behavior in air pollutants loading trends and, in general, is in less agreement with that relating the findings with those recently recounted by satellite observations.