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Environmental Assessment

Air Quality Criteria for Particulate Matter Document

Objective/Intended Use

The Clean Air Act requires periodic (5 year) update revision of the Air Quality Criteria for Particulate Matter Document (PM AQCD). This started in fiscal year 1998, following July 1997 promulgation of a new PM NAAQS. The outcome of this assessment activity is a document that provides scientific bases for the risk assessment (OAQPS Staff Paper) supporting the NAAQS review and is typical of the activities NCEA conducts under its mission to serve as the national resource center for human health and ecological risk assessment.

Technical Information Staff
  • by phone at:   703-347-8561
  • by fax at:   703-347-8691
  • by email at:  nceadc.comment@epa.gov

Project Abstact

A Planning Document was produced by NCEA/RTP and reviewed by the Clean Air Scientific Advisory Committee (CASAC) (62 FR 55201, October 23, 1997). In FY99, a workshop draft of the PM AQCD was completed, a peer input workshop held, and an External Review Draft released for public comment and CASAC review. The public review and CASAC meeting was completed in December 1999 (64 FR 61875, November 15, 1999). The draft PM AQCD was revised to respond to comments and to update the literature. A Second External Review Draft was issued in March 2001 and another CASAC review held in July 2001 (66 FR 34924, July 2, 2001). Revisions in response to CASAC and public comments on the second external review draft were then incorporated into the third ERD issued in May 2002 67 FR 31303, May 9, 2002). Another CASAC review was held July 2002 (67 FR 41723, June 19, 2002), after which further revisions were incorporated into a Fourth External Draft released in June, 2003. After CASAC review of that draft in August, 2003 (when closure was reached on Chapters 1-6), further revisions were incorporated into Chapters 7 (Toxicology) and 8 Epidemiology) and reviewed by CASAC in February 2004. Additional revisions to those chapters were made and the Integrative Syntheses (Chapter 9) released June 30, 2004 for 30-day public comment and review by CASAC on July 20-21, 2004. Closure was achieved on Chapters 7 and 8. A revised Chapter 9 is now available for public review and comment and will be reviewed by CASAC on September 20, 2004. The final version of the PM AQCD was completed October 29, 2004.

Project Status

Ongoing. The 2nd External Review Draft was released in March 2001 and reviewed by CASAC July 2001. The third draft was released in May 2002 and was reviewed by the CASAC in July 2002. The fourth draft was released in June 2003 and reviewed in August 2003 with closure on Chapters 1-6. Chapters 7, 8, and 9 were released June 14, 2004 and reviewed by CASAC July 20-21, 2004. EPA also made further revised drafts of Chapters 7, 8, and 9 available for CASAC and public review in June 2004. These revised draft chapters were reviewed by CASAC at a public meeting held July 20-21, 2004. Closure was achieved on Chapters 7 and 8. A revised Chapter 9 is now available for public review and comment and will be reviewed by CASAC via a publically accessible teleconference on September 20, 2004. (For information on the CASAC meeting see 69 FR 52255, August 25, 2004.) The final document is expected to be completed by October 29, 2004.

Project Dates

Project Start Date
  01/01/1998
Project Completion Date (Actual/Projected)
  10/29/2004

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