Kentucky's State Implementation Plan (SIP)
This page provides summaries of proposed and finalized revisions to Kentucky's air quality State Implementation Plans (SIPs) beginning in 2026. For earlier SIP revisions dating back to 2007, please visit the archived SIP Revisions web page.
July 20, 2026 - Attainment Demonstration for the Partial Counties of Henderson and Webster Located within the Kentucky 2010 1-Hour Sulfur Dioxide Nonattainment Area
On
July 20, 2026 the Energy and Environment Cabinet submitted to the U.S.
Environmental Protection Agency (EPA) a revision to the Kentucky State Implementation
Plan (SIP) to address all outstanding portions of an attainment plan in
accordance with Clean Air Act Section 172(c) for the Henderson-Webster 2010
1-hour sulfur dioxide (SO2) nonattainment area comprising portions of Henderson and Webster
counties.
Please note, the Base Year Emissions Inventory SIP and Nonattainment New Source Review SIP submittals for the Henderson-Webster 2010 1-hour SO2 nonattainment area were submitted to EPA seperately in 2024. More information about both prior SIP submittals can be found on the archived SIP revisions web page.
Final Henderson-Webster Attainment Demonstration and Statement of Consideration.pdf
Appendix D - Attainment Year Emissions Inventory.xlsx
Appendix F - Vehicle Miles Travel and Vehicle Hours Traveled Summary File.xlsx
Appenix I - BACT Analysis from Rio Tinto Alcan.xls
Appendix L modeling files are available upon request.
Mar. 2, 2026 - Removal of the Federal Reformulated Gasoline (RFG) Program From the Kentucky Portion of the Louisville, KY-IN Area
On March 2, 2026 the U.S. Environmental Protection Agency (EPA) announced the approval of the Kentucky Division for Air Quality's (Division) petition to opt-out of the reformulated gasoline (RFG) program and remove the requirement to sell RFG in Jefferson County and parts of Bullitt and Oldham Counties.
EPA has set an effective date for the opt-out from the RFG program as May 27, 2026. EPA has determined that the removal of the RFG program for the Kentucky portion of the Louisville, KY-IN Area is consistent with the applicable provisions of the Clean Air Act (CAA) and the EPA's regulations.
The approval can be found in the Federal Register.