Airborne lead levels in the local atmosphere of Islamabad, Pakistan, monitored at eight sampling sites, with low to moderately high traffic density, were determined by the flame AAS method using the high volume sampling and scrubbing techniques separately. Concentrated nittic acid based digestion method was employed for the dissolution of particulate matter collected on glass fiber filters, while the dithizorie-carbon tetrachloride scrubbing method was used to trap the particulate matter at an air flow rate of 1.0 LPM. The lead levels determined by the scrubbing method ranged from 13 l!glm3 to 90 l!glm3 and from 30 l!glm3 to 69 l!glm3 as determined by the high volume sampling method. Climatic parameters, such as temperature, sunshine, wind speed, wind direction, pan evaporation and relative humidity, were included in the study, in relation to specific geographic terrain of the area, to evolve a probable correlation with the disttibution of lead in the local atmosphere. Data on airborne lead disttibution from other parts of the world are described and discussed.
M SAQIB ,M JAFFAR ,
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