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2014 National Air Toxics Assessment (NATA) 
U.S. Environmental Protection Agency :: U.S. EPA 
2018 
U.S. Environmental Protection Agency 
Research Triangle Park, NC 
English 
The 2014 NATA assessment includes emissions, ambient concentrations, and exposure estimates for about 180 of the 187 Clean Air Act air toxics plus diesel particulate matter (diesel PM). For about 140 of these air toxics (those with health data based on long-term exposure), the assessment estimates cancer risks, from the potential for noncancer health effects, or both. This includes noncancer health effects for diesel PM. We did not include eight air toxics in this NATA assessment because either no emissions data were reported for them in 2014 or we couldn’t reliably make emissions or health-related estimates (radionuclides, for example).

NATA includes four steps:

1. Compile a national inventory of air toxics emissions from outdoor sources from emissions year 2014.
2. Estimate ambient concentrations of air toxics across the United States.
3. Estimate population exposures.
4. Characterize potential public health risks due to breathing air toxics (including both cancer and noncancer effects). 
08/27/2018 
08/27/2018 
08/17/2018 
The most recent update to the National Air Toxics Assessment (NATA). 
• Ethylbenzene