Raleigh / Durham / Chapel Hill (Triangle) Area

Supplement for Redesignation Demonstration and Maintenance Plan for the Raleigh-Durham-Chapel Hill
8-hour Ozone Maintenance Area - February 2013

The final "Supplement for Redesignation Demonstration and Maintenance Plan for the Raleigh-Durham-Chapel Hill 8-hour Ozone Maintenance Area", referred to as the Triangle area, was submitted to the United States Environmental Protection Agency (USEPA) on March 27, 2013. In this supplement, the USEPA is requested to relax the current 7.8 pounds per square inch (psi) Reid Vapor Pressure (RVP) requirement for three Triangle counties subject to the summertime gasoline volatility standard contained in 40 CFR 80.27(a)(2). Approval of this request will enable 9.0 psi gasoline to be distributed in the entire Triangle area throughout the year. The analysis indicates that relaxation of the RVP standard in the Triangle maintenance area does not interfere with the attainment of National Ambient Air Quality Standards (NAAQS). The supplement also contains updated on-road motor vehicle emission budgets and future year emissions inventories with the latest USEPA MOtor Vehicle Emissions Simulator (MOVES) mobile model.

The transmittal letter, narrative, and appendices are available through the links found below:

DEQ Submittals:

EPA Actions:

  • Final Rule: Approval and Promulgation of Implementation Plans; North Carolina: Non-Interference Demonstration for Removal of Federal Low-Reid Vapor Pressure Requirement for the Raleigh-Durham-Chapel Hill Area (79 FR 47, January 2, 2014)
  • Proposed Rule: Approval and Promulgation of Implementation Plans; North Carolina: Non-Interference Demonstration for Removal of Federal Low-Reid Vapor Pressure Requirement for the Raleigh-Durham-Chapel Hill Area (78 FR 64896, October 30, 2014)
  • Note add  which contains EPA’s proposal to amend CFR via a direct final rule.  Then find the later FR notice where EPA withdrew the direct final rule to address someone’s comment and to finalize their revision to the CFR. 

Please direct any further questions or comments concerning this SIP submittal to Ms. Sushma Masemore at Sushma.Masemore@ncdenr.gov.


Redesignation Demonstration and Maintenance Plan - June 2007

The final version of the "Redesignation Demonstration and Maintenance Plan for the Raleigh-Durham-Chapel Hill, North Carolina 8-Hour Ozone Nonattainment Area" narrative and appendices were submitted to the United States Environmental Protection Agency on Friday, June 7, 2007. The narrative documents that the Raleigh-Durham-Chapel Hill (Triangle) area has attained the 8-hour ozone national ambient air quality standard, fulfilling requirements of Section 175A(b) of the Federal Clean Air Act as amended. The transmittal letter, narrative, and appendices are available through the links found below:

DEQ Submittals:

EPA Actions:

  • Final Rule: Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; North Carolina; Redesignation of the Raleigh-Durham Chapel Hill 8-Hour Ozone Nonattainment Area to Attainment for Ozone (72 FR 72948, December 26, 2007)
  • Proposed Rule: Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; North Carolina; Redesignation of the Raleigh-Durham Chapel Hill 8-Hour Ozone Nonattainment Area to Attainment for Ozone (72 FR 56312, October 3, 2007)

Please direct any further questions or comments concerning this SIP submittal to Ms. Sushma Masemore at Sushma.Masemore@ncdenr.gov.


Supplement to the 1-Hour Ozone Maintenance Plan Update - February 2008

The "Supplement to the 1-Hour Ozone Maintenance Plan Update for the Raleigh/Durham & Greensboro/Winston-Salem/High Point 1-Hour Ozone Maintenance Areas" narrative is posted. A request for public comments and a request for public hearing notice was open through January 25, 2008. There were not any comments received or any requests for public hearing. Therefore, a public hearing was not scheduled or held regarding this "Supplement Package." The final Supplement Package was submitted to the United States Environmental Protection Agency on February 4, 2008.