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  • 1 University of the Punjab Institute of Chemistry Lahore Pakistan
  • 2 Pakistan Institute of Nuclear Science and Technology P.O. Nilore Islamabad Pakistan
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The determination of Ce, Yb, Se and Cr has been carried out in the atmosphere of Lahore, Faisalabad, Rawalpindi, Islamabad, Wah Cantt and Khanispur (background area) by INAA. Ce and Cr are associated with anthropogenic activities, while Yb is mainly due to soil derived aerosols. Se represents both anthropogenic as well as soil derived aerosols.