Targeting lead in the multimedia environment in the continental United States.

摘要: The U.S. Environmental Protection Agency's (EPA) lead attainment strategy for air is being expanded to address geographic areas with the potential multimedia, multipathway exposures lead. Geographic Information Systems (GIS) technology used coordinate information from various databases identify of concern. data retrieval and decision processes in identifying priority sources each medium evaluating identified concern are described this paper. Only EPA reliable locational were facilitate accurate mapping allow correlation other sources. loadings air, water, soils mapped using either latitude longitude or zip code, county centroids lacking longitudinal latitudinal coordinates (such as drinking water data). A multimedia cluster was at level, since all facility five could be level. An impact factor weighting system devised combine on number facilities their relative size developing a ranking clusters region. counties highest points considered Two separate lists developed according point system. One 10 regions, 100 country whole. project designed first step targeting future efforts environmental problems associated analyses presented paper provide look where there exposure more refined analysis code level subsequently good understanding issues pertaining neighborhood results will ultimately help states target implementation enforcement high exposures.