Environmental Protection Agency: Criteria Air Pollutants
The Clean Air Act requires EPA to set National Ambient Air Quality Standards (NAAQS) for six common air pollutants (also known as “criteria air pollutants“).
These pollutants are found all over the U.S. They can harm your health and the environment, and cause property damage.
Learn how EPA sets, reviews and revises standards (primary standards and secondary standards), determines whether areas meet the standards, and works with areas to attain and maintain the standards.