Abstract
Concentrations of trace chemical constituents were determined in size-fractionated and whole ambient air aerosol samples collected in Karachi, Pakistan, at four locations. The sampling sites were so chosen as to preferentially collect aerosols from sea, industrial areas, downtown and a steel mill. The aerosols from the industrial areas frequently showed unusually high Sb and Pb concentrations, especially in the fine fraction. The Pb/Sb ratio in such cases was $ ̃ 18–25. It was concluded that these were derived from a storage-battery plant where Sb (4–5%) is alloyed with Pb in plates. Mn and Fe rich aerosols were detected in the vicinity of the steel mill, probably from fugitive emissions of raw material and not emission stacks. The SO 4 2−/Se ratio indicated that the emissions from the steel mill chimneys are dispersed over a wide region.
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