In the Indian region, continuous measurement of
ground-based tropospheric O3 and NOx are scarce to go for a reliable
assessment of regionally resolved trends, except for the fortnightly
O3 soundings of the Indian Meteorological Department
(www.imd.gov.in). In this context, it is attempted to delineate the
seasonal trends in tropospheric column O3 and NOx using the
satellite data.