Geospatial and ground based monitoring of gaseous air pollutants to understand their environmental chemistry and relationship with meteorological parameters in a semi urban environment at Third Pole.

The Third pole which includes the Himalayas has experienced significant environmental changes over the last five decades. Indian Himalayan region (IHR) is one of the most fragile ecosystems on this planet. The present study deals with the study of gaseous air pollutants such as SO2,NO2,CO,O3 and NO2 at Mohal Kullu to understand the seasonal behavior of pollutants and there atmospheric reaction with meteorological parameters. Gaseous air pollutants was monitored using Thermo fisher Scientific gas analyzer at ground level and by using SENTINLE -5P data using google earth engine.The results revealed that SO2 showed highest concentration of 2.12±0.03ppb in winter at ground level and lowest concentration 0.81±0.02 ppb in monsoon the reason being low availability of OH radical in winter. NO2 and O3 showed highest concentration in summer followed by autumn and lowest concentration in monsoon due to high rate of photochemical chain reaction in summer when compared to monsoon. Similar results were obtained using SENTINEL-5P data. The present study will help the researchers to understand the environmental chemistry and seasonal atmospheric behavior of gaseous air pollutants in Indian Himalayan Region.