A study in air pollution was carried out in an urban background site of Karachi city to generate base line data for major gaseous pollutants; SO2 CO O3 NO and NOx in the ambient air along with the meteorological parameter. The data was collected in the year 2000. The collected data was analyzed for hourly average and the 24h average and TWA values. Monthly average concentration of SO2, CO, O3, NO and NOx during the year was determined to be in range of 0.4-5.6ppb, 0.2-0.8ppm, 7.2-24.0ppb, 1.5-28.6 ppb and 5.7-38.9ppb, respectively. The results suggest that all the air pollutants at this particular sampling site were mainly caused due to the emission from motor vehicles, which were coming from main super Highway.
G H SHEIKH ,D R HASHMI ,T H USMANI ,
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