HiPERiSM Services: Air Quality Modeling - CAA

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The Clean Air Act (CAA)

Title 1 of the Clean Air Act (CAA) directs the U.S. EPA to establish National Ambient Air Quality Standards (NAAQS) for common pollutants posing health risks. The standards specify acceptable concentrations in outdoor air. In addition, Federal regulation requires States to demonstrate attainment of the NAAQS. Together the States and the U.S. EPA enact regulations to control industrial and commercial pollutant emission sources, while only the U.S. EPA regulates mobile emissions sources.

In the 1970’s the CAA came into being and established Criteria Pollutants and Ambient Standards. In 1990 the CAA was amended to add Air Toxics and Acid Rain provisions and so-called non-attainment areas were classified.

The principal pollutants identified in the CAA include:

  • Ground level ozone (O3 - contributor to smog)
  • Particulate Matter (PM) in the 2.5 to 10 micron range (PM2.5 and PM10) that poses atmospheric haze and respiratory risk
  • Lead (Pb)
  • Nitrogen dioxide (NO2)
  • Sulfur dioxide (SO2)
  • Carbon monoxide (CO)

Further information on the CAA and U.S. EPA is available at the following sites:



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