Satellite and ground-based seasonal variability of NO_2 and SO_2 over New Delhi, India

摘要

Remote sensing technology application emerges as a useful tool for revealing atmospheric pollution in the last two decades. In this study, we used Aura satellite Ozone Monitoring Instrument (OMI) tropospheric NO_2 and planetary boundary layer (pbl) SO_2 retrieval data (October 2004 - September 2013) to generate a composite spatial map of different seasons over New Delhi National Capital Region (NCR). For surface measurements, we used Central Pollution Control Board (CPCB) NO_2 and SO_2 data (January 2005 - December 2013). Further, we compared the satellite retrievals data to the surface measurements. A higher NO2 concentration in both OMI and CPCB stations measurements are obtained in winter season followed by summer and minimum in monsoon months. OMI SO_2 concentration is higher in monsoon months and almost comparable in summer and winter seasons. We obtained a statistically significant correlation between OMI tropospheric NO_2 and CPCB surface measurements.