Description: NATA assembles information on air toxics, characterizes emissions, and rioritizes air toxics and locations that merit more refined analysis and investigation. This information is used to plan, and assist with the implementation of, national, regional, and local efforts to reduce toxic air pollution. Using general information about sources to develop estimates of risks, NATA provides screening-level estimates of the risk of cancer and other potentially serious health effects as a result of inhaling air toxics. The resulting risk estimates are purposefully more likely to be overestimates of health impacts than underestimates, and thus they are health protective.NATA uses emissions data compiled for a single year as inputs for modeling ambient air concentrations and estimating health risks. Results include estimates of ambient concentrations and exposure concentrations (ECs) of air toxics and estimates of cancer risks and potential noncancer health effectsassociated with chronic inhalation exposure to air toxics. The estimates are generated within each state,at both county and census-tract levels.NATA provides a “snapshot” of outdoor air quality and the risks to human health that might result if air toxic emission levels were to remain at the same levels as those estimated for the assessment year. The estimates reflect only risks associated with chronic (relatively long-term) exposures to the inhalation ofair toxics at the population level. The assumptions and methods used to complete the national-scale assessments limit the types of questions that NATA can answer reliably. NATA results are useful for prioritizing air toxics and emission sources, identifying locations of interest that require additional investigation, providing a starting point for local-scale assessments, focusing community efforts to reduce local emissions of air toxics, and informing the design of new monitoring programs or the re-design of existing ones. NATA results also can provide general answers to questions about emissions, ambient air concentrations, and exposures and risks across broad geographic areas (such as counties, states, the nation) at a moment in time. Disclaimer: This product is for informational purposes only and may not be suitable for legal, engineering, or surveying purposes. It does not represent an official survey and represents only the approximate relative location of features and boundaries. Mapping may not necessarily reflect on-the-ground conditions. This product and those involved in its production make no claims as to the accuracy or reliability of the data, and neither assumes, nor will accept liability for their use.