Greensboro / Winston-Salem / High Point (Triad) Area

Supplement to the Maintenance Plan for 1997 8-hour Ozone - April 2013

The final "Supplement to the Maintenance Plan for the 1997 8-hour Ozone Standard for the Greensboro/Winston-Salem/High Point, NC (Triad) Maintenance Area" was submitted to the United States Environmental Protection Agency (USEPA) on April 12, 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 four Triad counties: Davidson, Davie, Forsyth, and Guilford. Each county is 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 Triad area throughout the year. The technical demonstration shows that relaxation of the RVP standard in the Triad maintenance area does not interfere with the attainment of National Ambient Air Quality Standards (NAAQS).

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 Greensboro/Winston-Salem/High Point Area (79 FR 4082, January 24, 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 Greensboro/Winston-Salem/High Point Area (78 FR 70516, November 26, 2013)

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


Maintenance Plan for 1997 8-hour Ozone - April 2011

The final "Section 110(a)(1) Maintenance Plan for the 1997 8-Hour Ozone Standard for the Greensboro/Winston-Salem/High Point 1-Hour Ozone Maintenance Area" State Implementation Plan (SIP) package was submitted to the United States Environmental Protection Agency (USEPA) on April 13, 2011. The transmittal letter, narrative, and appendices are available through the links found below.

DEQ Submittals:

EPA Actions:

  • Direct Final Rule: Approval and Promulgation of Implementation Plans; North Carolina: Approval of Section 110(a)(1) Maintenance Plan for the Greensboro Winston-Salem-High Point 1-Hour Ozone Maintenance Area to Maintain the 1997 8-Hour Ozone Standards (77 FR 3611, January 25, 2012)
  • Proposed Rule: Approval and Promulgation of Implementation Plans; North Carolina: Approval of Section 110(a)(1) Maintenance Plan for the Greensboro Winston-Salem-High Point 1-Hour Ozone Maintenance Area to Maintain the 1997 8-Hour Ozone Standards (77 FR 3719, January 25, 2012)

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 Plan - 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.

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


Supplement to the Redesignation and Maintenance Plan for Fine Particulate Matter - December 2010

On December 22, 2010, the Division of Air Quality (DAQ) submitted to the USEPA a "Supplement to the Hickory and Triad Areas' Maintenance Plan", revising the motor vehicle emission and the motor vehicle emission budgets for transportation conformity purposes using the new USEPA mobile model Motor Vehicle Emission Simulator (MOVES). Additionally, the DAQ submitted an Errata document to make minor corrections or changes, at the request of the USEPA, to the redesignation demonstration and maintenance plan for the fine particulate matter nonattainment areas. The transmittal letter, the supplement narrative, appendices and errata document are available through the links found below.

DEQ Submittals:

The Supplement made revisions to select pages of the Redesignation Demonstration and Maintenance Plan Narrative and Appendix E - Hearing Report. The Supplement replaced in its entirety Appendix C.3 - On-Road Mobile Source Emission Inventory Documentation. The Errata also made changes to select pages of the Narrative and Appendix C.1 - Point Source Emission Inventory Documentation. Below are the documents affected by the Supplement and Errata with the new pages inserted.

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 Greensboro Winston-Salem-High Point 1997 Annual Fine Particulate Matter Nonattainment Area to Attainment (76 FR 71455, November 18, 2011)
  • Proposed Rule: Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; North Carolina: Redesignation of the Greensboro Winston-Salem-High Point 1997 Annual Fine Particulate Matter Nonattainment Area to Attainment (76 FR 59345, September 26, 2011)

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


Redesignation and Maintenance Plan for Fine Particulate Matter - December 2009

The final "Redesignation Demonstration and Maintenance Plan for the Hickory and Greensboro/Winston-Salem/High Point Fine Particulate Matter Nonattainment Areas" State Implementation Plan (SIP) package was submitted to the United States Environmental Protection Agency (USEPA) on December 18, 2009. The narrative documents that the Hickory and Triad areas have attained the 1997 annual fine particulate matter (PM2.5) 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:

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


Attainment Demonstration Plan for Fine Particulate Matter - August 2009

The final "The North Carolina Fine Particulate Matter Attainment Demonstration for the Hickory and Triad Fine Particulate Matter Nonattainment Areas" State Implementation Plan (SIP) package was submitted to the United States Environmental Protection Agency (USEPA) on August 21, 2009. The transmittal letter, narrative, and appendices are available through the links found below:

DEQ Submittals:

EPA Actions:

This Attainment Demonstration Plan is required by the Clean Air Act and provides the State's plan on actions and measures necessary in order for Hickory and the Triad to attain the PM2.5 annual standard by the April 5, 2010 attainment date. As of the end of 2008, both of these regions have achieved attainment. To this end, a Redesignation and Maintenance Plan is currently being developed and will be released for public comment by the end of October 2009.

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