Airborne particles collected from a heavily industrialized site were analyzed by chemical speciation of seven trace metals: Pb, Cd, Cr, Cu, Ni, Zn, and As. The average concentrations were as follows: $Zn,;502.0{pm}230.7;;Pb,;176.5{pm}310.9;;Cu,;111.9{pm}82.7;;As,;38.0{pm}31.0;;Cr,;21.5{pm}24.4;;Cd,;20.8{pm}17.4;;and;Ni,;11.4{pm}8.4;ng/m^3$. The median enrichment factor (EF) values of Cd (7,280), As (1,030), Cu (215), Zn (214), and Pb (143), with respect to iron, were much larger than 100. We observed that Cd was found in the soluble and exchange- able form (56.9%), and that Pb and Cr were found in carbonates, oxides and the reducible form (69.8% and 61.1%, respectively). These two forms, which are the most easily absorbed into human body tissue, predominated in most of the trace metals investigated in this study.