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Air Quality

Regulation and SIP Management

New Source Review (NSR)

New Source Review (NSR) is a preconstruction permitting program that started with the Clean Air Act Amendments of 1977. The goal of NSR is to ensure that new facilities do not significantly degrade existing air quality in areas that attain the National Ambient Air Quality Standards (NAAQS), or prevent areas that are in nonattainment with the NAAQS from slowing progress towards improving their air quality. NSR also ensures that new facilities use the most current emissions control technology. The Environmental Protection Agency (EPA) significantly amended the NSR program in 2002, and DHEC incorporated those changes in 2005. DHEC incorporated further changes in 2009 and 2011, and EPA granted full approval to all three of these NSR revisions in 2011. Please see EPA's NSR webpage for more information.

On June 23, 2011, the Environmental Protection Agency (EPA) approved DHEC's February 25, 2011, amendments to S.C. Regulation 61-62.5, Standard No. 7, Prevention of Significant Deterioration; S.C. Regulation 61-62.5, Standard No. 7.1, Nonattainment New Source Review (NSR); and the State Implementation Plan (SIP) to incorporate provisions of the following federal rules:

  • "Final Rule To Implement the 8-Hour Ozone National Ambient Air Quality Standard - Phase 2" (70 FR 71612, November 29, 2005) by clarifying that DHEC considers NOX as a precursor to ozone in S.C. Regulation 61-62.5, Standard No. 7, Prevention of Significant Deterioration, and
  • "Implementation of the New Source Review (NSR) Program for Particulate Matter Less Than 2.5 Micrometers (PM2.5)" (73 FR 28321, May 16, 2008) by amending the definitions of "Regulated NSR Pollutant" to include precursors for PM2.5 and the definitions of "Significant" to include thresholds for PM2.5 in S.C. Regulation 61-62.5, Standard No. 7, and R. 61-62.5, Standard 7.1, and clarifying exemptions for PM2.5 in S.C. Regulation 61-62.5, Standard No. 7.

New Source Review Revision Documents

Federal Register Publications

  • "Approval and Promulgation of Implementation Plans; South Carolina: Prevention of Significant Deterioration and Nonattainment New Source Review; Fine Particulate Matter and Nitrogen Oxides as a Precursor to Ozone" (76 FR 36875, June 23, 2011)
  • "Final Rule To Implement the 8-Hour Ozone National Ambient Air Quality Standard" (70 FR 71612, November 29, 2005)
  • "Implementation of the New Source Review (NSR) Program for Particulate Matter Less Than 2.5 Micrometers (PM2.5)" (73 FR 28321, May 16, 2008)

If you have any questions, please contact Maeve Mason by phone at (803) 898-2230 or by email


For more information please contact the Bureau of Air Quality at (803) 898-4123 or by email.