EPA has completed the process of updating and revising, where appropriate, its Air Quality Criteria for Particulate Matter (PM) as issued in 1996 (usually referred to as the Criteria Document). Sections 108 and 109 of the Clean Air Act require that EPA carry out a periodic review and revision, where appropriate, of the air quality criteria (embodied in the Criteria Document) and national ambient air quality standards (NAAQS) for criteria air pollutants such as PM. Details of EPA's plans for the review of the NAAQS for PM were initially announced in the Federal Register (62 FR 55201, October 23, 1997). EPA made a First External Review Draft of the updated Air Quality Criteria for Particulate Matter available for review by the Clean Air Scientific Advisory Committee (CASAC) and members of the public in October 1999 (64 FR 57884, October 27, 1999). Following that public review period and a meeting of the CASAC in December 1999 (64 FR 61875, November 15, 1999), EPA revised the document as appropriate to incorporate CASAC and public comments, as well as to reflect many new studies on the effects of PM that were not available in time for discussion in the First External Review Draft.
The final version of the entire PM Criteria Document was issued in October 2004.
ROBERT W. ELIAS
email: [email protected]