This 2002 draft document presents 1996 modeled air exposure concentration estimates for toxic pollutants including lead, manganese, and arsenic across all U.S. states. It compares statewide source contributions from major industrial areas, onroad vehicles, nonroad sources, and background levels. Supplementary 2001 monitoring data from Sea-Tac Airport and nearby Seattle sites shows measured concentrations of these pollutants, with some local readings—such as a single manganese measurement exceeding 36 ng/m³ and an arsenic reading surpassing 12 ng/m³—notably higher than regional averages.Open full document
Notes
A draft document presenting 1996 modeled exposure concentration data for lead, manganese, and arsenic across all U.S. states and territories. The charts show statewide source sector contribution estimates for lead (with nonroad sources identified as the largest contributor for Washington) and concentration distribution estimates for manganese and arsenic. Supplementary 2001 monitoring data from Sea-Tac Airport and nearby Seattle-area sites are included for comparison.