One of the most populated regions (Indo-Gangetic Plain) of the world is located in south Asia, where varieties of anthropogenic and biogenic emission sources are housing. On the other hand, pristine regions like the Himalayas and the oceanic regions are also located here and making this region an ideal laboratory to study influences of diverse emissions, dynamics and photochemistry. In view of this and realizing the scarcity of observational data, an observational facility was setup at ARIES, Nainital (29.4N, 79.5E; 1950 m) in the central Himalayas and at two sites in the IGP region. Surface observations of different trace gases (Ozone, CO, NO, NOy, light NMHCs, SO2, CO2 and other GHGs) and aerosols are initiated. Regular, once in a week, balloon-borne measurements of ozone, RH, temperature and GPS winds are also being made since January 2011. Observations at mountain site show signature of relative clean environment, while observations in IGP regions are strongly influenced by local and regional pollutions. A strong seasonal cycle in the lower tropospheric ozone with highest values during spring (~ 100 ppbv) and lowest during summer-monsoon (20-40 ppbv) is discerned. Few events of downward ozone transport are seen, but such influences are seen to be weaker in the eastern part of the Himalayas. Influences of biomass burning are seen even over the central Himalayas. In-contrast to trace gases over the central Himalayas, surface BC level is higher in winter and AOD and aerosol absorption are highest in spring over IGP. Further analysis of these observations with the help of air trajectories, satellite data and WRF-Chem model will be discussed.