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Air Quality Program

National Air Toxics Assessment Information

The National Air Toxics Assessment (NATA) is an EPA study of toxic air pollutants, or air toxics. NATA’s purpose is to estimate health risks from exposure to air toxics.

EPA uses information about air toxic emissions and weather to estimate the amount of air toxics in the outdoor (ambient) air. EPA then estimates the health risks of these amounts.

EPA has conducted four NATAs for each U.S. census tract, county, and state. These four assessments were based on 1996, 1999, 2002, and 2005 emission data. EPA released the results of the 2005 NATA in March 2011.

Washington State has a list of toxic air pollutants that are of greatest concern in our state. These substances are of the most concern because they:

  • may cause harm from cancer based on a 1-in-a-million risk; or
  • may cause harm other than cancer (have a potential for adverse health effects).

For more information,contact Gary Palcisko, 360-407-7338.