Limited Maintenance Plan for the Great Smoky Mountains National Park, Rocky Mount, & Triangle Maintenance Areas for the 1997 8-Hour Ozone NAAQS

Pre-Hearing Draft – Wednesday, August 5, 2020

The pre-hearing draft of the State Implementation Plan (SIP) revision for the “Limited Maintenance Plan (LMP) for the Great Smoky Mountains National Park (GSMNP), Rocky Mount, & Triangle Maintenance Areas for the 1997 8-Hour Ozone National Ambient Air Quality Standard (NAAQS)” is available for review and public comment.  The North Carolina Division of Air Quality (DAQ) prepared this LMP for the GSMNP, Rocky Mount, and Triangle maintenance areas for the 1997 8-hour ozone NAAQS to comply with the D.C. Circuit decision that vacated EPA’s interpretation that the second maintenance plans were not required for “orphan maintenance areas” (i.e., areas that had been redesignated to attainment for the 1997 ozone NAAQS (maintenance areas) and designated attainment for the 2008 ozone NAAQS) (South Coast, 882 F.3d 1138 (D.C. Cir. 2018)). The LMP covers the last 10 years of the 20-year maintenance period for each area as follows:

  • GSMNP – January 7, 2020 through January 6, 2030
  • Rocky Mount – January 6, 2017 through January 5, 2027
  • Triangle – December 27, 2017 through December 26, 2027

The DAQ prepared the LMP following EPA guidance to fulfill the requirements of Clean Air Act Section 175A(b) with respect to the second maintenance plan period for each of the three areas. The DAQ intends to submit a final version of this LMP to EPA for incorporation into North Carolina’s SIP after considering relevant public comments.

DEQ Submittal:

The comment period duration is from Wednesday, August 5, 2020 through Wednesday, September 9, 2020. Written requests for a public hearing must follow the procedures in the public notice and should be postmarked or submitted electronically no later than September 9, 2020. Please submit comments via any of the methods below:

  • Postal Mail:
    Planning Section Chief
    NC Division of Air Quality
    1641 Mail Service Center
    Raleigh, NC  27699-1641
  • Fax:
    (919) 715-0718