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EPA Releases Final Science Review Document of Clean Air Standards for Particulate Matter

Release Date: 11/01/2004
Contact Information:

Contact: Cynthia Bergman 202-564-9828 /

(Washington, D.C.-November 1, 2004) To further EPA's goal of safe and healthy air for every American community, EPA has released the final scientific assessment document on airborne particulate matter, entitled Air Quality Criteria for Particulate Matter. Particulate matter (PM) is one of six principal or criteria pollutants for which EPA has established National Ambient Air Quality Standards (NAAQS) under the Clean Air Act. In accordance with the requirements of the CAA, EPA periodically reviews the scientific basis for these standards. This document provides significant new information for the technical and policy assessments of EPA’s review of the standards.

The document includes an analysis of a very large amount of new scientific literature generated since the NAAQS for PM were revised in 1997. This final assessment document has been subjected to expert scientific peer review by the Clean Air Scientific Advisory Committee, a review committee mandated by the Clean Air Act and part of the EPA’s Science Advisory Board.

Information on the new Criteria Document, PM research and some of the major actions EPA is taking to reduce PM is at the following websites:

The “Air Quality Criteria for Particulate Matter” document is at:
(For print copies, call 1-800-490-9198 and ask for report number EPA 600/P-99/002F.) ;

EPA’s recently published report, "Particulate Matter (PM) Research Program: Five Years of Progress” is also posted at: ;

To learn about the fine particle standard, visit: ;

Information on the non-road diesel program is at: ; and for further information on EPA’s clean diesel program, visit: .