A study on the measurement of concentration of major components in the ambient air was carried out at five different stations in Karachi city and data was collected for O3, SO2, CO, NO and NOx along with the meteorological parameter. The data generated has been evaluated for Time Weighted Average (TWA) values. The results suggest that all the pollutants were mainly due to the emission from industries, refineries, power generation plants and also from motor vehicles. Due to absence of regulatory laws/standards about ambient air quality in Pakistan; the results have been discussed with reference to the ambient air quality limits recommended by the World Health Organization.
D R HASHMI ,G H SHEIKH ,T H USMANI ,
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