EPA Approved Nonregulatory Provisions and Quasi-Regulatory Measures in the Kentucky 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. The following files are federally approved regulations as of April 8, 2025.
EPA—Approved Kentucky Non-regulatory Provisions
| Name of non-regulatory SIP provision | Applicable geographic or nonattainment area | State Submittal or State Effective Date | EPA Approval Date | FR Citation | Explanation | Link to Final Rule | Regulations.gov Docket ID |
|---|---|---|---|---|---|---|---|
| Air Quality surveillance plan | Commonwealth of Kentucky | 11/15/1979 | 11/16/1981 | 46 FR 56198 | 46 FR 56198 | ||
| Protection Visibility in Class I Areas | Mammoth Cave National Park (Class I area) | 8/31/1997 | 7/12/1988 | 53 FR 26253 | 53 FR 26253 | ||
| Small Business Assistance Program | Commonwealth of Kentucky | 7/15/1993 | 6/19/1995 | 60 FR 31912 | 60 FR 31912 | KY–67–1–6130a | |
| Lexington Maintenance Plan | Fayette County, Scott County | 8/24/2004 | 9/16/2004 | 69 FR 55749 | 69 FR 55749 | R04–OAR–2004–KY–0001–200423 | |
| Ashland-Huntington Maintenance Plan | Boyd County, Greenup County | 5/24/1995 | 6/29/1995 | 60 FR 33748 | 60 FR 33748 | KY–074–1–6948 | |
| Maintenance Plan for Owensboro & Edmonson County Area | Daviess County, Hancock County, Edmonson County | 4/14/1998 | 9/3/1998 | 63 FR 46894 | 63 FR 46894 | KY–104–9818a | |
| Northern Kentucky 15% Plan & I/M | Boone, Campbell and Kenton Counties | 9/11/1998 | 12/8/1998 | 63 FR 67586 | 63 FR 67586 | KY–102–106–9903a | |
| Negative Declarations for the nonattainment portions of Bullitt and Oldham Counties in Louisville 1-hour moderate ozone nonattainment area for CTG rules for aerospace, SOCMI, shipbuilding, and wood furniture manufacturing | Jefferson County, Bullitt County, Oldham County | 12/14/1999 | 10/23/2001 | 66 FR 53662 | 66 FR 53662 | KY–131, and KY–133–200201; | |
| Negative Declarations submitted by the Air Pollution Control District of Jefferson County for the Louisville 1-hour moderate ozone nonattainment area for CTG rules for aerospace, shipbuilding, and wood furniture manufacturing | Jefferson County, Bullitt County, Oldham County | 2/26/2001 | 10/23/2001 | 66 FR 53662 | 66 FR 53662 | KY–131, and KY–133–200201 | |
| Louisville 1-Hour Ozone Maintenance Plan | Jefferson County and portions of Bullitt and Oldham Counties | 11/1/2003 | 5/18/2005 | 70 FR 28429 | 70 FR 28429 | R04–OAR–2004–KY–0002–200511 | |
| Maintenance Plan for Paducah Area | Marshall County and a portion of Livingston County | 6/14/2001 | 8/20/2001 | 66 FR 43488 | 66 FR 43488 | KY130–200117(a) | |
| Northern Kentucky 1-Hour Ozone Maintenance Plan | Boone, Campbell, and Kenton Counties | 2/9/2005 | 10/4/2005 | 70 FR 57750 | 70 FR 57750 | R04–OAR–2004–KY–0003–200529 | |
| 8-Hour Ozone Maintenance Plan for the Christian County, Kentucky area | Christian County | 5/20/2005 | 1/25/2006 | 71 FR 4047 | 71 FR 4047 | EPA–R04–OAR–2005–KY–0001–200521(f) | |
| Kentucky portion of the Ashland-Huntington Sulfur Dioxide Maintenance Plan | Boyd County | 5/13/2005 | 05/24/06, | 71 FR 29786 | 71 FR 29786 | R04–OAR–2005–KY–0002–200531(a) | |
| Louisville 8-hour Ozone Maintenance Plan | Bullitt County, Jefferson County, Oldham County | 9/26/2006 | 7/5/2007 | 72 FR 36601 | 72 FR 36601 | EPA–RO4–OAR–2006–0584–200723 | |
| Huntington-Ashland 8-hour Ozone Maintenance Plan | Boyd County | 9/29/2006 | 8/3/2007 | 72 FR 43172 | 72 FR 43172 | EPA–R04–OAR–2006–0362–200702 | |
| Northern Kentucky 8-Hour Ozone Maintenance plan | Boone, Campbell and Kenton Counties in Kentucky | 1/29/2010 | 8/5/2010 | 75 FR 47218 | For the 1997 8-hour ozone NAAQS. | 75 FR 47218 | EPA–R04–OAR–2006–0362–200702 |
| Paducah 8-Hour Ozone Attainment/1-Hour Ozone Maintenance Plan Section 110(a)(1) | Marshall and Livingston Counties | 5/27/2008 | 8/26/2010 | 75 FR 52467 | 75 FR 52467 | EPA–R04–OAR–2007–1186–201021 | |
| Huntington—Ashland 8-Hour Ozone Section 110(a)(1) Maintenance Plan | A portion of Greenup County | 5/27/2008 | 4/14/2011 | 76 FR 20853 | For the 1997 8-hour ozone NAAQS. | 76 FR 20853 | EPA–R04–OAR–2007–1186–201114 |
| Lexington 8-Hour Ozone Section 110(a)(1) Maintenance Plan Section 110(a)(1) | Fayette and Scott Counties | 5/27/2008 | 4/14/2011 | 76 FR 20853 | For the 1997 8-hour ozone NAAQS. | 76 FR 20853 | EPA–R04–OAR–2007–1186–201114 |
| Edmonson County 8-Hour Ozone Section 110(a)(1) Maintenance Plan | Edmonson County | 5/27/2008 | 4/14/2011 | 76 FR 20853 | For the 1997 8-hour ozone NAAQS. | 76 FR 20853 | EPA–R04–OAR–2007–1186–201114 |
| Owensboro 8-Hour Ozone Section 110(a)(1) Maintenance Plan | Daviess County and a portion of Hancock County | 5/27/2008 | 4/14/2011 | 76 FR 20853 | For the 1997 8-hour ozone NAAQS. | 76 FR 20853 | EPA–R04–OAR–2007–1186–201114 |
| 110(a)(1) and (2) Infrastructure Requirements for the 1997 8-Hour Ozone National Ambient Air Quality Standards | Commonwealth of Kentucky | 12/13/2007 | 7/13/2011 | 76 FR 41088 | For the 1997 8-hour ozone NAAQS. | 76 FR 41088 | EPA–R04–OAR–2009–0426–201124 |
| 1997 Annual PM2.5 Maintenance Plan for the Northern Kentucky Area | Boone, Campbell and Kenton Counties (Kentucky portion of the Cincinnati-Hamilton OH-KY-IN Area) | 1/27/2011 | 12/15/2011 | 76 FR 77903 | For the 1997 Annual PM2.5 NAAQS. | 76 FR 77903 | EPA–R04–OAR–2010–0937–201164 |
| Huntington-Ashland 1997 PM2.5 Attainment Plan | Boyd County; Portion of Lawrence County | 12/3/2008 | 4/11/2012 | 77 FR 21663 | For the 1997 PM2.5 NAAQS. | 77 FR 21663 | EPA–R04–OAR–2010–0255 |
| Regional Haze Plan and Plan Amendment | Statewide | 06/25/08 and 05/28/10 | 3/30/2012 | 77 FR 19098 | Source-specific BART requirements are summarized in Table 7.5.3-2 of the Commonwealth's May 28, 2010 submittal. | 77 FR 19098 | EPA–R04–OAR–2009–0783 |
| Louisville; 1997 Annual Fine Particulate Matter 2002 Base Year Emissions Inventory | Bullitt and Jefferson Counties | 12/3/2008 | 8/2/2012 | 77 FR 45956 | 77 FR 45956 | EPA–R04–OAR–2012–0336 | |
| 110(a)(1) and (2) Infrastructure Requirements for 1997 Fine Particulate Matter National Ambient Air Quality Standards | Kentucky | 8/26/2008 | 10/3/2012 | 77 FR 60307 | With the exception of section 110(a)(2)(D)(i), With respect to sections 110(a)(2)(C) related to PSD requirements and 110(a)(2)(J) related to PSD requirements, EPA conditionally approved these requirements. | 77 FR 60307 | EPA–R04–OAR–2010–1014 |
| 110(a)(1) and (2) Infrastructure Requirements for 2006 Fine Particulate Matter National Ambient Air Quality Standards | Kentucky | 7/17/2012 | 10/3/2012 | 77 FR 60307 | With the exception of section 110(a)(2)(D)(i), With respect to sections 110(a)(2)(C) related to PSD requirements and 110(a)(2)(J) related to PSD requirements, EPA conditionally approved these requirements. | 77 FR 60307 | EPA–R04–OAR–2010–1014 |
| 1997 Annual PM2.5 Maintenance Plan for the Kentucky portion of the Huntington-Ashland Area | Boyd County and Lawrence County (part) (Kentucky portion of the Huntington-Ashland WV-KY-OH Area) | 2/9/2012 | 12/26/2012 | 77 FR 75865 | For the 1997 Annual PM2.5 NAAQS. | 77 FR 75865 | EPA–R04–OAR–2012–0751 |
| 110(a)(1) and (2) Infrastructure Requirements for the 2008 8-Hour Ozone National Ambient Air Quality Standards | Commonwealth of Kentucky | 7/17/2012 | 3/7/2013 | 78 FR 14681 | With the exception of section 110(a)(2)(D)(i)(I) concerning interstate transport which is being disapproved and, the portions of sections 110(a)(2)(C), prong 3 of 110(a)(2)(D)(i), and 110(a)(2)(J) related to structural PSD requirements, which are being conditionally approved. | 78 FR 14681 | EPA–R04–OAR–2012–0700 |
| MVEB Update for the 1997 8-hour Ozone Maintenance Plan for Northern Kentucky | Boone, Campbell, and Kenton Counties, KY | 8/9/2012 | 6/5/2013 | 78 FR 33726 | 78 FR 33726 | EPA–R04–OAR–2013–0062 | |
| 110(a)(1) and (2) Infrastructure Requirements for 1997 Fine Particulate Matter National Ambient Air Quality Standards | Kentucky | 8/26/2008 | 5/7/2014 | 79 FR 26143 | Addressing prong 4 of section 110(a)(2)(D)(i) only. | 79 FR 26143 | EPA–R04–OAR–2012–0814 |
| 110(a)(1) and (2) Infrastructure Requirements for 2006 Fine Particulate Matter National Ambient Air Quality Standards | Kentucky | 7/17/2012 | 5/7/2014 | 79 FR 26143 | Addressing prong 4 of section 110(a)(2)(D)(i) only. | 79 FR 26143 | EPA–R04–OAR–2012–0814 |
| 110(a)(1) and (2) Infrastructure Requirements for the 2008 Lead NAAQS | Kentucky | 7/17/2012 | 3/18/2015 | 80 FR 14019 | Addressing the PSD permitting requirements of sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J) only | 80 FR 14019 | EPA–R04–OAR–2014–0610 |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 NO2 NAAQS | Kentucky | 4/26/2013 | 3/18/2015 | 80 FR 14019 | Addressing the PSD permitting requirements of sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J) only. | 80 FR 14019 | EPA–R04–OAR–2014–0610 |
| 110(a)(1) and (2) Infrastructure Requirements for the 2008 Lead National Ambient Air Quality Standards | Commonwealth of Kentucky | 7/17/2012 | 10/9/2015 | 80 FR 61107 | With the exception of provisions pertaining to PSD permitting requirements in sections 110(a)(2)(C), 110(a)(2)(D)(i)(II) (prong 3) and 110(a)(2)(J) only | 80 FR 61107 | EPA–R04–OAR–2014–0443 |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 1-hour NO2 NAAQS | Kentucky | 4/26/2013 | 11/21/2016 | 81 FR 83152 | With the exception of the regulation of new minor sources and minor modifications under section 110(a)(2)(C), section 110(a)(2)(D)(i)(I) and (II) (prongs 1-4) and the PSD requirements of section 110(a)(2)(J). | 81 FR 83152 | EPA–R04–OAR–2014–0767 |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 1-hour SO2 NAAQS | Kentucky | 4/26/2013 | 12/6/2016 | 81 FR 87818 | With the exception of the minor source program requirements of section 110(a)(2)(C) and the interstate transport requirements of section 110(a)(2)(D)(i)(I) and (II) (prongs 1, 2, and 4). | 81 FR 87818 | EPA–R04–OAR–2014–0426 |
| 2010 1-hour SO2 Maintenance Plan for the Kentucky Portion of the Campbell-Clermont, KY-OH Area | Campbell County portion of Campbell-Clermont, KY-OH Nonattainment Area | 2/22/2016 | 3/10/2017 | 82 FR 13227 | This includes the 172(c)(1) RACM determination and the 172(c)(3) base-year emissions inventory. | 82 FR 13227 | EPA–R04–OAR–2016–0361 |
| RACM for the Kentucky portion of Louisville, KY-IN Area for the 1997 Annual PM2.5 NAAQS | Bullitt and Jefferson Counties | 8/9/2016 | 12/27/2016 | 82 FR 95041 | 81 FR 95041 | EPA–R04–OAR–2016–0526 | |
| 1997 Annual PM2.5 Maintenance Plan for the Kentucky portion of the bi-state Louisville Area | Bullitt and Jefferson Counties | 3/5/2012 | 4/7/2017 | 82 FR 16943 | 82 FR 16943 | EPA–R04–OAR–2012–0773 | |
| 2008 8-hour ozone NAAQS Nonattainment New Source Review Requirements for the Kentucky Portion of the Cincinnati-Hamilton OH-KY-IN Area | Boone, Campbell and Kenton Counties (part) (Kentucky portion of the Cincinnati-Hamilton, OH-KY-IN Area) | 8/26/2016 | 4/10/2017 | 82 FR 17131 | 82 FR 17131 | EPA–R04–OAR–2017–0048 | |
| 2008 8-hour ozone Maintenance Plan for the Kentucky portion of the Cincinnati-Hamilton, OH-KY-IN Area | Portions of Boone (2000 Census tracts: 702, 703.05, 703.06, 703.07, 703.08, 703.09, 704.01, 704.02, 705.01, 705.02, 706.01, 706.03, 706.04), Campbell (2000 Census tracts: 501, 502, 503, 504, 505, 506, 512, 513, 519.01, 519.03, 519.04, 520.01, 520.02, 521, 522, 523.01, 523.02, 524, 525, 526, 528, 529, 530, 531), and Kenton (2000 Census tracts: 603, 607, 609, 610, 611, 612, 613, 614, 616, 636.03, 636.04, 636.05, 636.06, 638, 640, 641, 642, 643, 644, 645, 646, 647, 648, 649, 650, 651, 652, 653, 654, 655.01, 655.02, 656, 657, 658, 659, 668, 669, 670, 671) Counties, KY | 8/26/2016 | 7/5/2017 | 82 FR 30978 | 82 FR 30978 | EPA–R04–OAR–2016–0601 | |
| 2008 8-hour ozone base year emissions inventory for the Kentucky portion of the Cincinnati-Hamilton, OH-KY-IN Area | Portions of Boone, Campbell and Kenton Counties in Kentucky | 8/26/2016 | 7/5/2017 | 82 FR 30978 | 182(a)(1) base-year emissions inventory | 82 FR 30978 | EPA–R04–OAR–2016–0601 |
| 110(a)(1) and (2) Infrastructure Requirements for the 2012 Annual Fine PM2.5 NAAQS | Kentucky | 2/8/2016 | 8/8/201 | 82 FR 37012 | With the exception of section 110(a)(2)(D)(i)(I) and (II) (prongs 1, 2 and 4) and the minor source program requirement of section 110(a)(2)(C). | 82 FR 37012 | EPA–R04–OAR–2016–0213 |
| September 2014 Regional Haze Progress Report | Kentucky | 9/17/2014 | 10/12/2017 | 82 FR 47378 | 82 FR 47378 | EPA–R04–OAR–2016–0462 | |
| Removal of Reliance on Reformulated Gasoline in the Kentucky portion of the Cincinnati-Hamilton, OH-KY-IN Area | Boone, Campbell and Kenton Counties (Kentucky portion of the Cincinnati-Hamilton Area) | 9/13/2017 | 4/2/2018 | 83 FR 13872 | 83 FR 13872 | EPA–R04–OAR–2017–0389 | |
| 110(a)(2)(D)(i)(I) Infrastructure Requirement for the 2008 8-Hour Ozone National Ambient Air Quality Standards | Commonwealth of Kentucky | 5/10/2018 | 7/17/2018 | 83 FR 33730 | 83 FR 33730 | EPA–R04–OAR–2018–0142 | |
| 110(a)(1) and (2) Infrastructure Requirements for the 2012 Annual PM2.5 NAAQS | Kentucky | 2/8/2016 | 9/25/2018 | 83 FR 48387 | Addressing Prongs 1 and 2 of section 110(a)(2)(D)(i)(I) only. | 83 FR 48387 | EPA–R04–OAR–2016–0334 |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 NO2 NAAQS | Kentucky | 4/26/2013 | 3/28/2019 | 84 FR 11652 | Only addresses the minor source program requirements of section 110(a)(2)(C). | 84 FR 11652 | EPA–R04–OAR–2016–0213 EPA–R04–OAR–2014–0767 EPA–R04–OAR–2014–0426 |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 SO2 NAAQS | Kentucky | 4/26/2013 | 3/28/2019 | 84 FR 11652 | Only addresses the minor source program requirements of section 110(a)(2)(C). | 84 FR 11652 | EPA–R04–OAR–2016–0213 EPA–R04–OAR–2014–0767 EPA–R04–OAR–2014–0426 |
| 110(a)(1) and (2) Infrastructure Requirements for the 2012 PM2.5 NAAQS | Kentucky | 2/8/2016 | 3/28/2019 | 84 FR 11652 | Only addresses the minor source program requirements of section 110(a)(2)(C). | 84 FR 11652 | EPA–R04–OAR–2016–0213 EPA–R04–OAR–2014–0767 EPA–R04–OAR–2014–0426 |
| 110(a)(1) and (2) Infrastructure Requirements for the 1997 8-hour Ozone NAAQS | Kentucky | 12/13/2007 | 4/8/2019 | 84 FR 13800 | Addressing prong 4 of section 110(a)(2)(D)(i)(II) only. | 84 FR 13800 | EPA–R04–OAR–2018–0799 |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 1-hour NO2 NAAQS | Kentucky | 4/26/2013 | 4/8/2019 | 84 FR 13800 | Addressing prong 4 of section 110(a)(2)(D)(i)(II) only. | 84 FR 13800 | EPA–R04–OAR–2018–0799 |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 1-hour SO2 NAAQS | Kentucky | 4/26/2013 | 4/8/2019 | 84 FR 13800 | Addressing prong 4 of section 110(a)(2)(D)(i)(II) only. | 84 FR 13800 | EPA–R04–OAR–2018–0799 |
| 110(a)(1) and (2) Infrastructure Requirements for the 2012 Annual PM2.5 NAAQS | Kentucky | 2/8/2016 | 4/8/2019 | 84 FR 13800 | Addressing prong 4 of section 110(a)(2)(D)(i)(II) only. | 84 FR 13800 | EPA–R04–OAR–2018–0799 |
| Regional Haze Plan Revision | Kentucky | 11/16/2018 | 4/8/2019 | 84 FR 13800 | 84 FR 13800 | EPA–R04–OAR–2018–0799 | |
| 2010 1-hour SO2 Attainment Demonstration for the Jefferson County Area | Jefferson County | 6/23/2017 | 6/28/2019 | 84 FR 30920 | 84 FR 30920 | EPA–R04–OAR–2017–0625 | |
| 2010 1-hour SO2 Jefferson County Nonattainment Plan for 172(c)(3) 2011 Base-Year Emissions Inventory | Jefferson County | 6/23/2017 | 6/28/2019 | 84 FR 30920 | 84 FR 30920 | EPA–R04–OAR–2017–0625 | |
| 2010 1-hour SO2 Jefferson County Nonattainment Plan for 172(c)(5) New Source Review Requirements | Jefferson County | 6/23/2017 | 6/28/2019 | 84 FR 30920 | 84 FR 30920 | EPA–R04–OAR–2017–0625 | |
| 110(a)(1) and (2) Infrastructure Requirements for the 2010 1-hour NO2 NAAQS | Kentucky | 11/16/2018 | 7/31/2019 | 84 FR 37101 | Addressing Prongs 1 and 2 of section 110(a)(2)(D)(i) only. | 84 FR 37101 | EPA–R04–OAR–2018–0759 |
| 110(a)(1) and (2) Infrastructure Requirements for the 2015 8-Hour Ozone NAAQS | Kentucky | 1/9/2019 | 6/1/2020 | 85 FR 33021 | With the exception of 110(a)(2)(D)(i)(I) (prongs 1 and 2), 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), and air quality modeling under section 110(a)(2)(K). | 85 FR 33021 | EPA–R04–OAR–2019–0217 |
| 2010 1-hour SO2 Maintenance Plan for the Jefferson County Area | Jefferson County | 12/9/2019 | 8/6/2020 | 85 FR 47670 | 85 FR 47670 | EPA–R04–OAR–2020–0003 | |
| 110(a)(1) and (2) Infrastructure Requirements for the 2015 8-Hour Ozone NAAQS | Kentucky | 1/11/2019 | 9/2/2020 | 85 FR 45407 | Addressing 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), and air quality modeling under section 110(a)(2)(K). | 85 FR 54507 | EPA–R04–OAR–2019–0217 |
| 2015 8-hour Ozone NAAQS Nonattainment New Source Review Requirements | Bullitt and Oldham Counties in the Louisville, KY-IN Marginal nonattainment area and portions of Boone, Campbell, and Kenton Counties in the Cincinnati, OH-KY Marginal nonattainment area | 10/15/2020 | 4/5/2022 | 87 FR 19649 | 87 FR 19649 | ||
| Emissions Statement Requirements for the 2015 8-hour Ozone NAAQS | Boone, Campbell, and Kenton Counties (partial) in Kentucky portion of Cincinnati, OH-KY Area, and Bullitt and Oldham Counties (entire) in Kentucky portion of Louisville, KY-IN Area | 10/15/2020 | 4/26/2022 . | 87 FR 24429 | 87 FR 24429 | EPA–R04–OAR–2021–0395 | |
| 1997 8-Hour Ozone Second 10-Year Limited Maintenance Plan for the Kentucky portion of the Huntington-Ashland, WV-KY Area | Boyd County | 3/29/2021 | 9/30/2022 | 87 FR 59311 | 87 FR 59311 | EPA–R04–OAR–2022–0167 | |
| 1997 8-Hour Ozone Second 10-Year Limited Maintenance Plan for the Kentucky Portion of the Clarksville-Hopkinsville, TN-KY Maintenance Area | Christian County | 3/29/2021 | 9/30/2022 | 87 FR 59311 | 87 FR 59311 | EPA–R04–OAR–2022–0167 | |
| Emissions Inventory for the 2015 8-hour Ozone NAAQS for Northern Kentucky | Boone, Campbell, and Kenton Counties (partial) in Kentucky portion of Cincinnati, OH-KY Area | 10/15/2021 | 9/30/2022 | 87 FR 59320 | 87 FR 59320 | EPA–R04–OAR–2022–0092 | |
| Emissions Inventory for the 2015 8-hour Ozone NAAQS for Louisville | Jefferson County in its entirety, and Bullitt and Oldham Counties (partial) in Kentucky portion of Louisville, KY-IN Area | 10/15/2021 | 9/30/2022 | 87 FR 59320 | 87 FR 59320 | EPA–R04–OAR–2022–0092 | |
| 2015 8-hour Ozone Maintenance Plan for the Kentucky Portion of the Cincinnati, OH-KY Area | Portions of Boone, Campbell, and Kenton Counties | 9/21/2022 | 10/04/2023 | 88 FR 68471 | 88 FR 68471 | EPA–R04–OAR–2022–0982 |