Summary of Results | 2002 National-Scale Air Toxics Assessme...     Of the 181 air toxics included in the 2002 national-scale assessment, the risk characterization considers the risk of both cancer and noncancer effects from inhalation of 124 of these air toxics -- the subset of pollutants with health data based on chronic exposure. The purpose of this national-scale assessment is to understand these cancer risks and noncancer health effects in order to help the EPA and others to identify pollutants and source categories of greatest potential concern, and to set priorities for the collection of additional information to improve future assessments. The assessment represents a "snapshot" in time for characterizing risks from exposure to air toxics. The national-scale assessment is not designed to characterize risks sufficiently for regulatory action.     http://www.epa.gov/ttn/atw/nata2002/risksum.html     tags: data toxic 2002 Assessment Results | 2002 National-Scale Air Toxics Ass...     These maps show the geographic patterns of estimated cumulative cancer or noncancer risk due to inhalation of air toxics. EPA developed these maps to inform both national and more localized efforts to collect air toxics information and characterize emissions (e.g., prioritize pollutants/geographic areas of interest for more refined data collection such as monitoring). See more information about limitations. These files not only present the risk levels for each tract, but also the HAPs contributing to risk levels and their percent contribution. An additional overlay provides the names and locations for each source indentified in the 2002 NEI for that tract.     http://www.epa.gov/ttn/atw/nata2002/tables.html     tags: data toxic