Regional Haze State SIP

DRAFT Reasonable Progress Assessment/Four-Factor Analyses for Second Planning Period (2018 – 2028)

As a part of the Regional Haze State Implementation Plan (SIP) development process for the second planning period, the North Carolina Division of Air Quality (NCDAQ) has requested three facilities in the state to complete a Reasonable Progress Assessment/Four-Factor Analysis for further controlling sulfur dioxide (SO2) emissions for improving visibility in the Shining Rock and Swanquarter Wilderness Areas. The NCDAQ has received external requests for the Reasonable Progress Assessment/Four-Factor Analysis for these three facilities. It is important to note that the NCDAQ staff is still reviewing the analyses.  Furthermore, the NCDAQ will request that the U.S. Environmental Protection Agency (USEPA) and Federal Land Managers (FLMs) review these analyses before the Regional Haze SIP is released for public comment later this Spring. Therefore, these analyses are draft and will be revised to address any comments from NCDAQ staff as well as comments received from the USEPA and FLMs prior to the public comment period.  The following provides a link to the draft analyses received from each of the three facilities.

Shining Rock Wilderness Area

Swanquarter Wilderness Area


Regional Haze SIP Revision for North Carolina Class I Areas - Alternative to Source Specific Best Available Retrofit Technology Demonstration (BART) for Electric Generating Units, October 31, 2014

North Carolina's Regional Haze SIP Revision - Alternative BART Demonstration was submitted to the U.S. Environmental Protection Agency (EPA) on October 31, 2014, and is available through the following links:

DEQ Submittals:

This document serves as a revision to the North Carolina Regional Haze SIP which was initially submitted to the EPA on December 17, 2007. It contains the technical information and data supporting North Carolina's Alternative to Source-Specific BART Determination for BART-eligible coal-fired electrical generating units pursuant to 40 CFR §51.308 under the Regional Haze program. It demonstrates that the North Carolina's Clean Smokestack Act meets Alternative BART requirements and achieves greater emissions reductions of sulfur dioxide and nitrogen oxides.

EPA Actions:

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


Regional Haze Mid-course State Implementation Plan - May 2013

The "Regional Haze 5-Year Periodic Review State Implementation Plan for North Carolina Class I Areas" is available through the following links:

DEQ Submittals:

This SIP revision addresses the requirements of Regional Haze Rule at 40 CFR 51.308(g) requiring periodic reports that evaluate progress towards the state's Reasonable Progress Goals. Comments received from the public, EPA, and Federal Land Managers (FLMs) have been addressed. The North Carolina Division of Air Quality has documented that based on visibility improvements observed in the 2006-2010 period and other source level activities, the state is on track to meet the 2018 reasonable progress goals for the North Carolina Class I areas and will not impede a Class I area outside of North Carolina from meeting their goals.

EPA Actions:

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


Regional Haze State Implementation Plan (SIP) - December 17, 2007

The Regional Haze State Implementation Plan narrative is posted. The Appendices are too large to post to a website.

EPA Actions:

Regional Haze State Implementation Plan

  • Final Rule: Approvals and Promulgations of Implementation Plans: State of North Carolina; Regional Haze State Implementation Plan (77 FR 38185, June 27, 2012)
  • Proposed Rule: Approvals and Promulgations of Implementation Plans: State of North Carolina; Regional Haze State Implementation Plan (77 FR 11858, February 28, 2012)

For a copy of the Appendices please send an e-mail request to the Planning Section Chief and put "Regional Haze SIP" in the subject line.