Jump to main content or area navigation.

Contact Us

Reviewing National Ambient Air Quality Standards – Scientific and Technical Information

Particulate Matter (PM) Standards


December 3, 2014 - EPA has initiated the next review of the PM NAAQS by issuing a call for information on recent research relating to the health and welfare effects of PM. In addition, EPA will hold a public workshop on February 9-11, 2015 to discuss policy-relevant issues and questions that will frame the review.

The Clean Air Act requires EPA to set national air quality standards for particulate matter and five other pollutants considered harmful to public health and the environment (the other pollutants are ozone, 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 this process

Documents from Current Review

Documents from Previous Reviews


Jump to main content.