2014 NATA: Assessment Results

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About the 2014 Assessment

This page provides the emissions data, ambient concentrations and health-effect results for the 2014 National Air Toxics Assessment. You can also find links to supporting files and web pages with more information about these results.

EPA developed NATA as a screening tool for state, local and tribal air agencies. NATA’s results help these agencies identify which pollutants, emission sources and places they may wish to study further to better understand any possible risks to public health from air toxics. Often, more localized studies are needed to better characterize local-level risk. These studies often include air monitoring and more detailed modeling. 

The following files will help you navigate the NATA results:

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2014 NATA Emissions

The 2014 NATA used the 2014 National Emissions Inventory (NEI) as a starting point. The NEI is EPA’s comprehensive estimate of air pollution emissions from sources across the country. NEI supports air quality modeling and other activities within EPA’s Air Toxics Program. We updated these data from comments provided by state, local and tribal agencies during the NATA review. The resulting emission files, accessed below, reflect the emissions used in NATA.

The county level emissions summary reflects all revisions made as a result of review comments. The stationary point source tables – Facility and Process Level Summaries – provide the detailed emissions data. Most of the changes made as a result of the review were made to the stationary point source information. 

The county-level emissions summary reflects all revisions made due to review comments. The stationary point source tables – Facility and Process Level Summaries – provide the detailed emissions data. Most review-based changes were made to the stationary point-source information. 

NOTE: Emission inventories submitted by state, local and tribal agencies vary in the level of detail and completeness. For this reason, you should not compare NATA risk estimates between states or regions without considering these inventory differences.

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