Observations of surface ozone, CO, NOx, CH4 and NMHCs were made at a semi urban site (Pantnagar) in the Indo-Gangetic plain region. Ozone diurnal variations are characterized by daytime photochemical buildup. Changes in ozone show a systematic increase from January 2014 to June 2014. Diurnal patterns in CO, NOx and THC also follow the characteristics of somewhat polluted site. Daily average values in CO, NOx, and THC follow a reverse trend when compared with that in ozone.
Based on the above study it is concluded that -
Oxidation of CO and THC in the troposphere results in the production of Ozone. So, emissions of CO and THC must be reduced so as to deal with the surface air pollution problem. In this process NOx plays a very critical role. It is also suggested to carry out a high resolution model study for this region to get better information on the different tropospheric processes occurring in this region.