EPA Approved Nonregulatory Provisions and Quasi-Regulatory Measures in the North Carolina SIP
About this website: This website does not necessarily represent the current version of the SIPs, TIPs, or FIPs. The official SIPs, TIPs, and FIPs are contained in regulations promulgated in the Federal Register and codified in the U.S. Code of Federal Regulations (CFR). While we make every effort to maintain the accuracy of the files accessible here, inconsistencies may occur. Please contact us using the link below if you find any errors in these files.
Updated as of: May 27, 2026.
EPA Contact: EPA Region 4: Weston Freund (404-562-8773)
EPA-Approved North Carolina Non-Regulatory Provisions
| Provision | State effective date | EPA Approval Date | FR Citation | Explanation |
|---|---|---|---|---|
| Capital Area, North Carolina Interagency Transportation Conformity Memorandum of Agreement | 1/1/2002 | 12/27/2002 | 67 FR 78983 | |
| Durham-Chapel Hill Interagency Transportation Conformity Memorandum of Agreement | 1/1/2002 | 12/27/2002 | 67 FR 78983 | |
| Winston-Salem Interagency Transportation Conformity Memorandum of Agreement | 1/1/2002 | 12/27/2002 | 67 FR 78983 | |
| High Point Interagency Transportation Conformity Memorandum of Agreement | 1/1/2002 | 12/27/2002 | 67 FR 78983 | |
| Greensboro Interagency Transportation Conformity Memorandum of Agreement | 1/1/2002 | 12/27/2002 | 67 FR 78983 | |
| Gaston, North Carolina Interagency Transportation Conformity Memorandum of Agreement | 1/1/2002 | 12/27/2002 | 67 FR 78983 | |
| Mecklenburg-Union Interagency Transportation Conformity Memorandum of Agreement | 8/7/2003 | 9/15/2003 | 68 FR 53883 | |
| 10 Year Maintenance Plan Update for the Raleigh/Durham Area | 6/4/2004 | 9/20/2004 | 69 FR 56163 | |
| 10 Year Maintenance Plan Update for the Greensboro/Winston-Salem/High Point Area | 6/4/2004 | 9/20/2004 | 69 FR 56163 | |
| Attainment Demonstration of the Mountain, Unifour, Triad and Fayetteville Early Action Compact Areas | 12/21/2004 | 8/22/2005 | 70 FR 48874 | |
| Charlotte, Raleigh-Durham, and Winston-Salem Carbon Monoxide Second 10-Year Maintenance Plan | 3/18/2005 | 3/24/2006 | 71 FR 14817 | |
| 8-Hour Ozone Maintenance plan for the Rocky Mount, North Carolina area (Edgecombe and Nash Counties) | 6/19/2006 | 11/6/2006 | 71 FR 64891 | |
| 8-Hour Ozone Maintenance plan for the Raleigh-Durham-Chapel Hill, North Carolina area (Durham, Franklin, Granville, Johnston, Orange, Person and Wake Counties in their entireties, and Baldwin, Center, New Hope and Williams Townships in Chatham County) | 6/7/2007 | 12/26/2007 | 72 FR 72948 | |
| 1-Hour Ozone Maintenance plan revision for the Greensboro/Winston-Salem/High Point area (Davidson, Forsyth, and Guilford counties and a portion of Davie County) | 2/4/2008 | 4/8/2008 | 73 FR 18963 | |
| 8-Hour Ozone Maintenance Plan for the Great Smoky Mountains National Park Area | 7/24/2009 | 12/7/2009 | 74 FR 63995 | |
| 1997 Annual PM2.5 Maintenance Plan for the Hickory, North Carolina Area (Catawba County) | 12/18/2009 | 11/18/2011 | 76 FR 71452 | |
| 1997 Annual PM2.5 Maintenance Plan for the Hickory, North Carolina Area—MOVES Update | 12/22/2010 | 11/18/2011 | 76 FR 71452 | |
| 1997 Annual PM2.5 Maintenance Plan for the Greensboro, North Carolina Area (Davidson and Guilford Counties) | 12/18/2009 | 11/18/2011 | 76 FR 71455 | |
| 1997 Annual PM2.5 Maintenance Plan for the Greensboro, North Carolina Area—MOVES Update | 12/22/2010 | 11/18/2011 | 76 FR 71455 | |
| North Carolina 110(a)(1) and (2) Infrastructure Requirements for the 1997 8-Hour Ozone National Ambient Air Quality Standards | 12/12/2007 | 2/6/2012 | 77 FR 5703 | |
| 1997 8-Hour Ozone 110(a)(1) Maintenance Plan for the Triad Area | 4/13/2011 | 1/25/2012 | 77 FR 3611 | |
| Supplement to 110(a)(1) Maintenance Plan for the Triad Area | 5/18/2011 | 1/25/2012 | 77 FR 3611 | |
| North Carolina portion of bi-state Charlotte; 1997 8-Hour Ozone 2002 Base Year Emissions Inventory | 11/12/2009 | 5/4/2012 | 77 FR 26441 | |
| Regional Haze Plan | 11/17/2007 | 6/27/2012 | 77 FR 38185 | |
| 110(a)(1) and (2) Infrastructure Requirements for 1997 Fine Particulate Matter National Ambient Air Quality Standards | 4/1/2008 | 10/16/2012 | 77 FR 63234 | With the exception of section 110(a)(2)(D)(i). With respect to sections 110(a)(2)(C) related to PSD requirements, 110(a)(2)(E)(ii) and 110(a)(2)(J) related to PSD requirements, EPA conditionally approved these requirements. |
| 110(a)(1) and (2) Infrastructure Requirements for 2006 Fine Particulate Matter National Ambient Air Quality Standards | 9/21/2009 | 10/16/2012 | 77 FR 63234 | With the exception of section 110(a)(2)(D)(i). With respect to sections 110(a)(2)(C) related to PSD requirements, 110(a)(2)(E)(ii) and 110(a)(2)(J) related to PSD requirements, EPA conditionally approved these requirements. |
| MVEB Update for the Redesignation and Maintenance Plan for the Rocky Mount, NC Area for the 1997 8-hour Ozone Standard | 2/7/2011 | 9/27/2012 | 77 FR 59335 | |
| 1997 8-hour ozone reasonable further progress plan for North Carolina portion of the bi-state Charlotte Area | 11/30/2009 | 10/12/2012 | 77 FR 62159 | |
| 8-Hour Carbon Monoxide Limited Maintenance Plan for Charlotte, Raleigh/Durham and Winston-Salem Maintenance Area | 8/2/2012 | 6/20/2013 | 78 FR 37118 | |
| 1997 8-hour ozone Maintenance Plan for the North Carolina portion of the bi-state Charlotte Area | 11/2/2011 and supplemented on 03/28/2013 | 12/2/2013 | 78 FR 72036 | |
| North Carolina Transportation Conformity Air Quality Implementation Plan | 7/12/2013 | 12/26/2013 | 78 FR 78266 | |
| Supplement Maintenance Plan for the Raleigh-Durham-Chapel Hill, NC 1997 8-hour Ozone Maintenance Area and RVP Standard | 3/27/2013 | 1/2/2014 | 79 FR 47 | |
| Supplement Maintenance Plan for the Greensboro/Winston-Salem/High Point Area, NC 1997 8-hour Ozone Maintenance Area and RVP Standard | 4/2/2013 | 1/24/2014 | 79 FR 4082 | |
| 110(a)(1) and (2) Infrastructure Requirements for 1997 Fine Particulate Matter National Ambient Air Quality Standards | 4/1/2008 | 5/7/2014 | 79 FR 26143 | Addressing prong 4 of section 110(a)(2)(D)(i) only. |
| 110(a)(1) and (2) Infrastructure Requirements for 2006 Fine Particulate Matter National Ambient Air Quality Standards | 9/21/2009 | 5/7/2014 | 79 FR 26143 | Addressing prong 4 of section 110(a)(2)(D)(i) only. |
| Non-Interference Demonstration for the North Carolina Inspection and Maintenance Program | 10/11/2013 | 2/5/2015 | 80 FR 6455 | |
| 110(a)(1) and (2) Infrastructure Requirements for the 2008 Lead National Ambient Air Quality Standards | 6/15/2012 | 3/9/2015 | 80 FR 12343 | With the exception of PSD permitting requirements for major sources of sections 110(a)(2)(C), prong 3 of D(i), and (J) and the state board requirements of 110(E)(ii). |
| North Carolina portion of bi-state Charlotte Area; 2008 8-Hour Ozone Base Year Emissions Inventory | 7/7/2014 | 4/21/2015 | 80 FR 22211 | |
| North Carolina portion of bi-state Charlotte Area; 2008 8-Hour Ozone Annual Emissions Reporting (Emissions Statements) | 7/7/2014 | 4/21/2015 | 80 FR 22107 | |
| Supplement Maintenance Plan for the Charlotte Area, NC 2008 8-hour Ozone Maintenance Area and RVP Standard | 4/16/2015 | 7/28/2015 | 80 FR 44868 | Provides the non-interference demonstration for revising the Federal Low-Reid Vapor Pressure requirement for the Charlotte Area, NC. |
| 2008 8-hour ozone Maintenance Plan for the North Carolina portion of the bi-state Charlotte Area | 4/16/2015 | 7/28/2015 | 80 FR 44873 | |
| 110(a)(1) and (2) Infrastructure Requirements for the 1997 8-hour Ozone NAAQS | 7/27/2015 | 11/3/2015 | 80 FR 67645 | Approving 110(a)(2)(E)(ii) as it relates to the Secretary of the DENR and his/her delegatee that approve permit or enforcement orders and appealed matters decided by ALJs. |
| 110(a)(1) and (2) Infrastructure Requirements for the 1997 Annual PM2.5 NAAQS | 7/27/2015 | 11/3/2015 | 80 FR 67645 | Approving 110(a)(2)(E)(ii) as it relates to the Secretary of the DENR and his/her delegatee that approve permit or enforcement orders and appealed matters decided by ALJs. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2006 24-hour PM2.5 NAAQS | 7/27/2015 | 11/3/2015 | 80 FR 67645 | Approving 110(a)(2)(E)(ii) as it relates to the Secretary of the DENR and his/her delegatee that approve permit or enforcement orders and appealed matters decided by ALJs. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2008 Lead NAAQS | 7/27/2015 | 11/3/2015 | 80 FR 67646 | Approving 110(a)(2)(E)(ii) as it relates to the Secretary of the DENR and his/her delegatee that approve permit or enforcement orders and appealed matters decided by ALJs. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2008 8-hour Ozone NAAQS | 7/27/2015 | 11/3/2015 | 80 FR 67645 | Approving 110(a)(2)(E)(ii) as it relates to the Secretary of the DENR and his/her delegatee that approve permit or enforcement orders and appealed matters decided by ALJs. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 NO2 NAAQS | 7/27/2015 | 11/3/2015 | 80 FR 67645 | Approving 110(a)(2)(E)(ii) as it relates to the Secretary of the DENR and his/her delegatee that approve permit or enforcement orders and appealed matters decided by ALJs. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 SO2 NAAQS | 7/27/2015 | 11/3/2015 | 80 FR 67645 | Approving 110(a)(2)(E)(ii) as it relates to the Secretary of the DENR and his/her delegatee that approve permit or enforcement orders and appealed matters decided by ALJs. |
| Chapter 7A section 754 of the North Carolina General Statues | 7/27/2015 | 11/3/2015 | 80 FR 67645 | Specifically, the following paragraph of 7A-754 stating “The Chief Administrative Law Judge and the administrative law judges shall comply with the Model Code of Judicial Conduct for State Administrative Law Judges, as adopted by the National Conference of Administrative Law Judges, Judicial Division, American Bar Association, (revised August 1998), as amended from time to time, except that the provisions of this section shall control as to the private practice of law in lieu of Canon 4G, and G.S. 126-13 shall control as to political activity in lieu of Canon 5.” is approved into the SIP. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2008 8-Hour Ozone National Ambient Air Quality Standards | 11/2/2012 | 11/5/2015 | 80 FR 68453 | With the exception of sections: 110(a)(2)(C) and (J) concerning PSD permitting requirements; 110(a)(2)(D)(i)(I) and (II) (prongs 1 through 4) concerning interstate transport requirements; 110(a)(2)(E)(ii) concerning state board requirements. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 1-hour SO2 NAAQS | 3/18/2014 | 4/26/2016 | 81 FR 24496 | With the exception of the PSD permitting requirements for major sources of sections 110(a)(2)(C) and (J), the interstate transport requirements of section 110(a)(2)(D)(i)(I) and (II) (prongs 1, 2, 3, and 4), and the state board requirements of section 110(E)(ii). |
| BART Alternative Plan | 10/31/2014 | 5/24/2016 | 81 FR 32652 | This plan modifies the Regional Haze Plan approved with a state effective date of 11/17/2007 (see above) and converts the June 27, 2012, limited approval to a full approval. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2008 8-Hour Ozone NAAQS | 11/2/2012 | 6/3/2016 | 81 FR 35634 | Addressing prong 4 of section 110(a)(2)(D)(i) only. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 1-hour NO2 NAAQS | 8/23/2013 | 6/3/2016 | 81 FR 35634 | Addressing prong 4 of section 110(a)(2)(D)(i) only. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 1-hour SO2 NAAQS | 3/18/2014 | 6/3/2016 | 81 FR 35634 | Addressing prong 4 of section 110(a)(2)(D)(i) only. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2012 Annual PM2.5 NAAQS | 12/4/2015 | 6/3/2016 | 81 FR 35634 | Addressing prong 4 of section 110(a)(2)(D)(i) only. |
| May 2013 Regional Haze Progress Report | 5/31/2013 | 8/25/2016 | 81 FR 58400 | Includes updated reasonable progress goals for North Carolina's Class I areas. |
| 110(a)(1) and (2) Infrastructure Requirements for 1997 Fine Particulate Matter NAAQS | 4/1/2008 | 9/14/2016 | 81 FR 63107 | Partially approve the PSD elements of sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J) and disapprove with respect to the PM2.5 increment requirements of 2010 PSD PM2.5 Rule. |
| 110(a)(1) and (2) Infrastructure Requirements for 2006 Fine Particulate Matter NAAQS | 9/21/2009 | 9/14/2016 | 81 FR 63107 | Partially approve the PSD elements of sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J) and disapprove with respect to the PM2.5 increment requirements of 2010 PSD PM2.5 Rule. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2008 Lead NAAQS | 6/15/2012 | 9/14/2016 | 81 FR 63107 | Partially approve the PSD elements of sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J) and disapprove with respect to the PM2.5 increment requirements of 2010 PSD PM2.5 Rule. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2008 8-Hour Ozone NAAQS | 11/2/2012 | 9/14/2016 | 81 FR 63107 | Partially approve the PSD elements of sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J) and disapprove with respect to the PM2.5 increment requirements of 2010 PSD PM2.5 Rule. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 1-hour NO2 NAAQS | 8/23/2013 | 9/14/2016 | 81 FR 63107 | Partially approve the PSD elements of sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J) and disapprove with respect to the PM2.5 increment requirements of 2010 PSD PM2.5 Rule. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 1-hour SO2 NAAQS | 3/18/2014 | 9/14/2016 | 81 FR 63107 | Partially approve the PSD elements of sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J) and disapprove with respect to the PM2.5 increment requirements of 2010 PSD PM2.5 Rule. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2012 Annual PM2.5 NAAQS | 12/4/2015 | 9/14/2016 | 81 FR 63107 | Partially approve the PSD elements of sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J) and disapprove with respect to the PM2.5 increment requirements of 2010 PSD PM2.5 Rule. |
| Good Neighbor Provisions (Section 110(a)(2)(D)(i)(I)) for the 2010 1-hour NO2 NAAQS | 3/24/2016 | 9/22/2016 | 81 FR 65288 | |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 1-hour NO2 NAAQS | 8/23/2013 | 10/14/2016 | 81 FR 70969 | With the exception of sections: 110(a)(2)(E)(ii) concerning state boards; 110(a)(2)(C) and (J) concerning PSD permitting requirements; and 110(a)(2)(D)(i)(I) and (II) (prongs 1 through 4) concerning interstate transport requirements. |
| 110(a)(1) and (2) Infrastructure Requirements for the 2012 Annual PM2.5 NAAQS | 12/4/2015 | 4/7/2017 | 82 FR 16924 | With the exception of section 110(a)(2)(D)(i)(I) and (II) (prongs 1 through 4) and the PSD requirements of section 110(a)(2)(C) and (J). |
| 110(a)(1) and (2) Infrastructure Requirements for the 2008 8-Hour Ozone NAAQS | 12/9/2015 | 10/4/2017 | 82 FR 46134 | Addressing prongs 1 and 2 of section 110(a)(2)(D)(i) only. |
| North Carolina Removal of 26 Counties from Inspection and Maintenance Program and 110(l) Non-Interference Demonstration | 11/17/2017 | 9/25/2018 | 83 FR 48383 | |
| 110(a)(1) and (2) Infrastructure Requirements for 1997 Fine Particulate Matter NAAQS | 4/1/2008 | 9/11/2018 | 83 FR 45827 | Approved the PSD elements of sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J). |
| 110(a)(1) and (2) Infrastructure Requirements for 2006 Fine Particulate Matter NAAQS | 9/21/2009 | 9/11/2018 | 83 FR 45827 | Approved the PSD elements of sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J). |
| 110(a)(1) and (2) Infrastructure Requirements for the 2008 Lead NAAQS | 6/15/2012 | 9/11/2018 | 83 FR 45827 | Approved the PSD elements of sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J). |
| 110(a)(1) and (2) Infrastructure Requirements for the 2008 8-Hour Ozone NAAQS | 11/2/2012 | 9/11/2018 | 83 FR 45827 | Approved the PSD elements of sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J). |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 1-hour NO2 NAAQS | 8/23/2013 | 9/11/2018 | 83 FR 45827 | Approved the PSD elements of sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J). |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 1-hour SO2 NAAQS | 3/18/2014 | 9/11/2018 | 83 FR 45827 | Approved the PSD elements of sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J). |
| 110(a)(1) and (2) Infrastructure Requirements for the 2012 Annual PM2.5 NAAQS | 12/4/2015 | 9/11/2018 | 83 FR 45827 | Approved the PSD elements of sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J). |
| 110(a)(1) and (2) Infrastructure Requirements for the 2012 Annual PM2.5 NAAQS | 12/4/2015 | 9/25/2018 | 83 FR 48387 | Addressing Prongs 1 and 2 of section 110(a)(2)(D)(i)(I) only. |
| 2008 8-hour ozone Maintenance Plan for the North Carolina portion of the bi-state Charlotte Area | 7/25/2018 | 9/11/2019 | 84 FR 47889 | |
| 110(a)(1) and (2) Infrastructure Requirements for the 2015 8-Hour Ozone NAAQS | 9/27/2018 | 3/11/2020 | 85 FR 14147 | With the exception of 110(a)(2)(D)(i)(l) (prongs 1 and 2) and PSD provisions related to major sources under sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3), and 110(a)(2)(J). |
| MVEB Revision to the 2008 8-hour ozone Maintenance Plan for the North Carolina portion of the bi-state Charlotte Area | 7/16/2020 | 8/25/2021 | 86 FR 47387 | |
| 110(a)(1) and (2) Infrastructure Requirements for the 2015 8-Hour Ozone NAAQS | 9/27/2018 | 12/2/2021 | 86 FR 68413 | |
| 1997 8-hour Ozone NAAQS 2nd Maintenance Plans (Limited Maintenance Plans) for the Great Smoky Mountains National Park, Raleigh-Durham-Chapel Hill, and Rocky Mount, North Carolina Areas | 9/22/2020 | 5/9/2022 | 87 FR 27521 | |
| Removal of Lee, Onslow, and Rockingham Counties from North Carolina's Inspection and Maintenance Program and 110(l) Non-Interference Demonstration | 12/14/2020 | 8/11/2022 | 87 FR 49524 | |
| 110(a)(1) and (2) Infrastructure Requirements for the 2015 8-Hour Ozone NAAQS | 4/13/2021 | 1/5/2023 | 88 FR 773 | Addressing the PSD provisions of sections 110(a)(2)(C), (D)(i)(II) (Prong 3), and (J) only |
| 1997 8-hour Ozone 2nd Maintenance Plan (Limited Maintenance Plan) for the North Carolina portion of the bi-state Charlotte Area | 12/9/2021 | 1/13/2023 | 88 FR 2245 | |
| Burlington-Graham Interagency Transportation Conformity Memorandum of Agreement | 1/30/2023 | 3/29/2023 | 88 FR 18423 | |
| Cabarrus-Rowan Interagency Transportation Conformity Memorandum of Agreement | 1/20/2023 | 3/29/2023 | 88 FR 18423 | |
| Charlotte Regional Interagency Transportation Conformity Memorandum of Agreement | 1/30/2023 | 3/29/2023 | 88 FR 18423 | |
| Durham-Chapel Hill-Carrboro Interagency Transportation Conformity Memorandum of Agreement | 1/30/2023 | 3/29/2023 | 88 FR 18423 | |
| Gaston-Cleveland-Lincoln Interagency Transportation Conformity Memorandum of Agreement | 1/30/2023 | 3/29/2023 | 88 FR 18423 | |
| Greater Hickory Interagency Transportation Conformity Memorandum of Agreement | 1/30/2023 | 3/29/2023 | 88 FR 18423 | |
| Greensboro Urban Area Interagency Transportation Conformity Memorandum of Agreement | 1/27/2023 | 3/29/2023 | 88 FR 18423 | |
| High Point Urban Area Interagency Transportation Conformity Memorandum of Agreement | 1/27/2023 | 3/29/2023 | 88 FR 18423 | |
| North Carolina Capital Area Interagency Transportation Conformity Memorandum of Agreement | 1/27/2023 | 3/29/2023 | 88 FR 18423 | |
| Rocky Mount Urban Area Interagency Transportation Conformity Memorandum of Agreement | 1/27/2023 | 3/29/2023 | 88 FR 18423 | |
| Winston-Salem-Forsyth Urban Area Interagency Transportation Conformity Memorandum of Agreement | 1/27/2023 | 3/29/2023 | 88 FR 18423 | |
| Rural (counties not covered by MPO, administered by North Carolina DOT) Interagency Transportation Conformity Memorandum of Agreement | 1/27/2023 | 3/29/2023 | 88 FR 18423 | |
| Great Smoky Mountains National Park (administered by NPS) Interagency Transportation Conformity Memorandum of Agreement | 1/30/2023 | 3/29/2023 | 88 FR 18423 | |
| MVEB Revision to the 2008 8-hour Ozone Maintenance Plan for the North Carolina portion of the bi-state Charlotte Area | 12/19/2022 | 6/13/2024 | 89 FR 50227 | |
| Regional Haze Plan—Second Planning Period | 4/4/2022 | 11/22/2024 | 88 FR 2245 | Approval of the portions of the Haze Plan addressing the requirements of 40 CFR 51.308(f)(1), (f)(4)-(6), and (g)(1)-(5). Disapproval of the portions of the Haze Plan addressing the requirements of 40 CFR 51.308(f)(2), (f)(3), and (i)(2)-(4). |