Charlotte/Gastonia/Salisbury, NC 2008 8-Hour Ozone Area

Supplement to the Revised Maintenance Plan for the
Charlotte-Gastonia-Salisbury, North Carolina 2008
8-Hour Ozone Marginal Nonattainment Area -- July 16, 2020

On July 16, 2020, the Division of Air Quality (DAQ) submitted the final “Supplement to the Revised Maintenance Plan for the Charlotte-Gastonia-Salisbury, North Carolina 2008 8-Hour Ozone Marginal Nonattainment Area” to the U.S. Environmental Protection Agency (EPA) for approval into North Carolina’s Clean Air Act Section 110 State Implementation Plan (SIP). The EPA designated the area attainment of the 2008 8-hour ozone National Ambient Air Quality Standards (NAAQS) effective August 27, 2015 (80 FR 44873). In this submittal, North Carolina is proposing to increase the amount of the total safety margin allocated to the 2026 motor vehicle emission budgets (MVEBs) from 4.7% to 9.4% for nitrogen oxides and from 18.7% to 37.4% for volatile organic compounds. The proposed revisions to the 2026 MVEBs will account for unanticipated changes in the travel demand model used to calculate vehicle miles traveled for the Charlotte area; however, the overall maintenance plan emissions will remain unchanged. In addition, the Charlotte-Gastonia-Salisbury area is attaining the 2008 and 2015 8-hour ozone NAAQS based on certified ambient monitoring data. Therefore, the DAQ concludes that the proposed revisions to the MVEBs will not interfere with any applicable requirement concerning the attainment and maintenance of the NAAQS. 

DEQ Submittals:

Please direct any further questions or comments concerning this SIP submittal to the Planning Section Chief.


Final State Implementation Plan (SIP) Revision Related to Changing the Vehicle Model Year Coverage for 22 Counties Subject to North Carolina’s Motor Vehicle Emissions Inspection and Maintenance (I&M) Program -- July 25, 2018

On July 25, 2018, the Department of Environmental Quality (DEQ) submitted a final package to the U.S. Environmental Protection Agency (EPA) to revise North Carolina’s motor vehicle Inspection and Maintenance (I&M) program SIP and Motor Vehicle Emission Control Standard air quality rules to comply with Section 3.5.(b) of Session Law 2017-10 which amended North Carolina General Statute §20-183.2(b) to change the vehicle model year coverage to a rolling 20-year cycle based on the most current year.  This action affected the counties covered by the Maintenance Plan for the Charlotte-Gastonia-Salisbury, North Carolina 2008 8-Hour Ozone Marginal Nonattainment Area.  Revisions to the maintenance plan, Clean Air Act Section 110(l) noninterference demonstration, revisions to North Carolina’s Inspection and Maintenance (I&M) Program SIP, and EPA’s approval of these items are located the I&M Program SIP webpage.


Redesignation Demonstration and Maintenance Plan, and
Clean Air Act Section 110(l) Non-Interference Demonstration to Support the Gasoline Reid Vapor Pressure (RVP) Standard Relaxation
in Gaston and Mecklenburg Counties -- April 16, 2015

The final "Redesignation Demonstration and Maintenance Plan for the Charlotte-Gastonia-Salisbury, North Carolina 2008 8-Hour Ozone Marginal Nonattainment Area" and the final "Clean Air Act Section 110(l) Non-Interference Demonstration to Support the Gasoline Reid Vapor Pressure (RVP) Standard Relaxation in Gaston and Mecklenburg Counties" were submitted to the U.S. Environmental Protection Agency on April 16, 2015. The narratives for both submittals document that the Charlotte-Gastonia-Salisbury area has attained the 2008 8-hour ozone national ambient air quality standard, fulfilling requirement of Section 175A(b) of the federal Clean Air Act as amended. The transmittal letter, narratives and appendices are available through the following links:

DEQ Submittals:

EPA Actions:

Redesignation Demonstration and Maintenance Plan

  • Final Rule: Approval and Promulgation of Implementation Plans and Designation of Areas; North Carolina; Redesignation of the Charlotte-Rock Hill, 2008 8-Hour Ozone Nonattainment Area to Attainment (80 FR 44873, July 28, 2015)
  • Proposed Rule: Approval and Promulgation of Implementation Plans and Designation of Areas; North Carolina; Redesignation of the Charlotte Rock Hill, 2008 8-Hour Ozone Nonattainment Area to Attainment (80 FR 29250, May 21, 2015)

Gasoline Reid Vapor Pressure (RVP) Standard Relaxation – Revision to Code of Federal Regulations

  • Direct Final Rule: Approval of North Carolina’s Request to Relax the Federal Reid Vapor Pressure Gasoline Volatility Standard for Mecklenburg and Gaston Counties (80 FR 49164, August 17, 2015)
  • Proposed Rule: Relaxation of the Federal Reid Vapor Pressure Gasoline Volatility Standard for Mecklenburg and Gaston Counties, North Carolina (80 FR 49193, August 17, 2015)

Gasoline RVP Standard Relaxation – Non-Interference Demonstration

  • Final Rule: Approval and Promulgation of Implementation Plans; North Carolina: Non-Interference Demonstration for Federal Low-Reid Vapor Pressure Requirement for Gaston and Mecklenburg Counties (80 FR 44868, July 28, 2015)
  • Proposed Rule: Approval and Promulgation of Implementation Plans; North Carolina: Non-Interference Demonstration for Federal Low-Reid Vapor Pressure Requirement for Gaston and Mecklenburg Counties (80 FR 29230, May 21, 2015)

Please direct any further questions or comments concerning this SIP submittal to the Planning Section Chief.


Base Year (2011) Emissions Inventory and Emissions Statements State Implementation Plan

The final "Charlotte-Gastonia-Salisbury 2008 8-hour Ozone Marginal Nonattainment Area Emissions Inventory and Emissions Statements State Implementation Plan" is available through the following links:

DEQ Submittals:

The purpose of the State Implementation Plan is to fulfill the requirements of sections 182(a)(1) and 182(a)(3)(B) of the Clean Air Act, which requires the State of North Carolina to submit a base year (2011) emissions inventory for nitrogen oxides (NOx) and volatile organic compounds (VOCs) in this nonattainment area and to ensure adequate provisions are in place that require the owner or operator of each stationary source of NOx and VOC to provide the state with a statement showing actual emissions within 24 months of designation.

EPA Actions:

  • Direct Final Rule: Approval and Promulgation of Implementation Plans; North Carolina; Charlotte; Base Year Emissions Inventory and Emissions Statement for the 2008 8-Hour Ozone Standard (80 FR 22107, April 21, 2015)
  • Proposed rule: Approval and Promulgation of Implementation Plans; North Carolina; Charlotte; Base Year Emissions Inventory and Emissions Statement Requirements for the 2008 8-Hour Ozone Standard (80 FR 22147; April 21, 2015)

Please direct any further questions or comments concerning this SIP submittal to the Planning Section Chief.