Figure 6a shows three pathways of Pb contamination of thesurface soil: re-suspension, adherence, and deposition. Resuspension and adherence occur primarily on the transportation route and are caused by differences in traffic typeand wind. Surface soil is re-suspended by traffic and thenscattered to the surrounding soil. Pb moves from theoriginal surface soil to other areas through re-suspension.Surface soil Pb directly or indirectly adheres to variousparts of vehicles as well as to residents. Adhered soil dust istransported by lifting and deposition onto other soil surfaces. Transfer of Pb to the atmosphere originates from thestack gas emissions of the ULAB recycling smelter.
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