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United States Environmental Protection Agency
National Air Toxics Assessment - 2005, EPA Region 2 (EPA.AIR.NATA99_R2)
This data layer is based on the model results of the 1999 National-Scale Assessment (N-SA), a part of the National Air Toxics Assessment (NATA), conducted by EPA's Office of Air Quality Planning & Standards (OAQPS). The assessment used computer models to estimate ambient air toxics concentrations and population exposures nationwide. Computer models were used since direct measurements of ambient air toxics concentrations are limited and direct personal exposure measurements are even more limited.
These data were used to create the air toxics cancer/noncancer risk layer which are used in EPA Region 2 as an indicator for environmental burden analysis.
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Data Are Restricted to Internal EPA Personnel Only and State Partners.
These data should not be distributed to users unless distribution is explicitly granted. Please check sources, scale, accuracy, currentness and other available information. Please confirm that you are using the most recent copy of both data and metadata. Acknowledgement of the EPA would be appreciated.
Environment and Conservation, Cancer risk, National Air Toxics Assessment, Hazard Index
US Environmental Protection Agency Region 2
EPA Region 2/GIS Team
Metadata Reference Information
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FGDC Content Standards for Digital Geospatial Metadata
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