Ozone (O3) Air Quality Standards
The Clean Air Act requires EPA to set national ambient air quality standards (NAAQS) for ozone and five other pollutants considered harmful to public health and the environment (the other pollutants are particulate matter, nitrogen oxides, carbon monoxide, sulfur dioxide and lead). The law also requires EPA to periodically review the standards to ensure that they provide adequate health and environmental protection, and to update those standards as necessary. Learn more about the NAAQS review process.
Documents from Current Review
Documents from Previous Reviews
- Documents from Review Completed in 2020 (including documents related to the reconsideration)
- Documents from Review Completed in 2015
- Documents from Review Completed in 2008 (including documents related to the reconsideration)
- Documents from Review Completed in 1997
- Documents from Reviews Completed Prior to 1997