The Clean Air Act requires EPA to set National Ambient Air Quality Standards (NAAQS) for six criteria pollutants; particle pollution (also known as particulate matter) is one of these.  EPA works with partners at state, local, and tribal air quality agencies to meet these standards.

The following list provides a collection of rules and guidance documents for implementation the more recent particulate matter (PM) standards.

• PM-2.5
• PM-2.5 (2006)
• PM-2.5 (1997) - To find implementation information and guidance documents for the 1997 PM NAAQS, go to archive.epa.gov and use the search term "PM Implementation NAAQS."
• PM-10 (1987) - To find implementation information and guidance documents for the 1987 PM NAAQS, go to archive.epa.gov and use the search term "PM Implementation NAAQS."
• General Preamble for the Implementation of Title 1 of the Clean Air Act Amendments of 1990

To see a table of all of the PM NAAQS visit our Historical Particulate Matter (PM) National Ambient Air Quality Standards (NAAQS) page.