OAR Policy and Guidance Metarecord

Document Title/Subject: Interim Implementation of New Source Review Requirements for PM2.5 Related Documents:	Signed by: John S. Seitz Signature Date: 10/23/97 Contact: Dan deRoeck Information Transfer and Program Integration Division, OAQPS	Filename(s): URL(s): http://www.epa.gov/ttn/caaa/t1/memoranda/pm25.pdf
Regulatory Authority: Title 1	Division: Information Transfer and Program Integration Division (OAQPS)	Submitted By: deroeck.dan
Document Type: Policy & Guidance Memos	EPA Document Number: Federal Register:	Supersedes:
Subject Category: Air	Keywords: Emissions Ozone Particulate matter Permits New Source Review (NSR) Prevention of Significant Deterioration (PSD) National Ambient Air Quality Standards (NAAQS) Chemical Reactions	Terms: Air quality Clean Air Act CAA Permits Standards
Abstract: This memorandum addresses the interim use of PM10 as a surrogate for PM 2.5 in meeting new source review (NSR) requirements under the Clean Air Act (CAA), including the permit programs for prevention of significant deterioration (PSD) of air quality. The revised national ambient air quality standards (NAAQS) for particulate matter, which include the revised NAAQS for PM10 and new NAAQS for PM2.5, became effective on September 16, 1997. In view of the significant technical difficulties that now exist with respect to PM2.5 monitoring, emission estimation, and modeling, EPA believes that PM10 should be used as a surrogate for PM2.5 in meeting NSR requirements until these difficulties are resolved. The EPA's views on implementing the ozone and PM10 NAAQS during the interim period following the effective date of the new 8-hour ozone and revised PM10 NAAQS are set forth in a separate EPA memorandum. This memorandum can be downloaded in both PDF and WP format and is approximately three pages in PDF format.

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