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Transport of air pollutants over the Indian Region

9. Ozone Concentrations

The Indian involvement in monitoring atmospheric ozone dates back to 1928 when Dr. Royds made total ozone measurements from Kodaikanal with Dobson photoelectric Ozone Spectrograph as part of the first worldwide ozone measurements organized by Prof. G.M.B Dobson. The first Dobson Spectrophotometer was acquired by India Meteorological Department (IMD) in 1940. Surface ozone is measured at the following stations in India⁷.

Temporal variations in grided concentrations of pollutant gases O₃, CO, NO_x, etc. are calculated for the Indian subcontinent (-0.91 degree North to 42.51 degree North latitude and 58.48 degree East to 105.98 degree East longitude) for January 16, 2000 to May 29, 2000 with a three hour time interval using the HANK software.

The following animation shows the temporal and spatial variation in the concentration of surface ozone over the grided Indian region. The boundary lines are approximate. (This animation requires QuickTIme 3.0 or later.)

⁷http://sedac.ciesin.org/ozone/WMO/india.html