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EPA/AR

RIN: 2060-AO47

Publication ID: Spring 2010

Title: Review of the National Ambient Air Quality Standards for Particulate Matter
Abstract: Under the Clean Air Act, EPA is required to review and, if appropriate, revise the air quality criteria for the primary (health-based) and secondary (welfare-based) national ambient air quality standards (NAAQS) every 5 years. On October 17, 2006, EPA published a final rule to revise the primary and secondary NAAQS for particulate matter to provide increased protection of public health and welfare. With regard to the primary standard for fine particles (generally referring to particles less than or equal to 2.5 micrometers in diameter, PM2.5), EPA revised the level of the 24-hour PM2.5 standard to 35 micrograms per cubic meter (ug/m3) and retained the level of the annual PM2.5 standard at 15 ug/m3. With regard to primary standards for particles generally less than or equal to 1 micrometers in diameter (PM10), EPA retained the 24-hour PM10 standard and revoked the annual PM10 standard. With regard to secondary PM standards, EPA made them identical in all respects to the primary PM standards, as revised. EPA initiated the current review in 2007 with a workshop to discuss key policy-relevant issues around which EPA would structure the review. This review includes the preparation of an Integrated Science Assessment, Risk/Exposure Assessment, and a Policy Assessment by EPA, with opportunities for review by EPA's Clean Air Scientific Advisory Committee and the public. These documents inform the Administrator's decision as to whether to retain or revise the standards.
Agency: Environmental Protection Agency(EPA)	Priority: Economically Significant
RIN Status: Previously published in the Unified Agenda	Agenda Stage of Rulemaking: Proposed Rule Stage
Major: Yes	Unfunded Mandates: No
CFR Citation: 40 CFR 50
Legal Authority: 42 USC 7408 42 USC 7409

Legal Deadline: None

Timetable:

Action	Date	FR Cite
NPRM	12/00/2010
Final Action	08/00/2011

Additional Information: SAN No. 5169; EPA Docket information: EPA-HQ-OAR-2007-0492.
Regulatory Flexibility Analysis Required: No	Government Levels Affected: Federal, Local, State, Tribal
Small Entities Affected: No	Federalism: No
Included in the Regulatory Plan: Yes
RIN Information URL: www.epa.gov/air/particlepollution
RIN Data Printed in the FR: No
Agency Contact: Beth Hassett-Sipple Environmental Protection Agency Air and Radiation MD-13, C504-06, Research Triangle Park, NC 27711 Phone:919 541-4605 Fax:919 541-0237 Email: hassett-sipple.beth@epa.gov Karen Martin Environmental Protection Agency Air and Radiation C504-06, Research Triangle Park, NC 27711 Phone:919 541-5274 Fax:919 541-0237 Email: Martin.Karen@epamail.epa.gov