Air pollutants Nitrogen Dioxide (NO2), Sulfur Dioxide (SO2), Carbon Monoxide (CO), and Ozone (O3) from the Sentinel-5 Tropospheric Monitoring Instrument (TROPOMI) were analyzed in four major cities in the Philippines, NCR, Legazpi City, Cebu City, and Davao City. representing different climate types. This study provides insights on the effect of quarantine periods and meteorological factors over the course of more than 3 years to the decline and rebound of gaseous pollutants.

This paper is part of the conference proceedings of the 43rd Asian Conference on Remote Sensing (ACRS 2022).