Determination of Attainment by the Attainment Date for the Louisville Moderate Area for the 2015 Ozone National Ambient Air Quality Standard
Published Date: 1/29/2026
Proposed Rule
Summary
The EPA says the Kentucky part of the Louisville area met the 2015 ozone air quality rules by the August 3, 2024 deadline, thanks in part to some special event exceptions. This means cleaner air for residents and no extra penalties or costly fixes right now. People and businesses in Louisville, KY, can breathe easier knowing the area is on track with air quality goals.
Analyzed Economic Effects
3 provisions identified: 3 benefits, 0 costs, 0 mixed.
Louisville KY Portion Met Ozone Standard
EPA proposes that the Kentucky portion of the Louisville, KY‑IN area attained the 2015 8‑hour ozone standard by the August 3, 2024 attainment date. The area's 2021–2023 design value is 0.070 parts per million (ppm) after EPA's partial concurrence excluding six wildfire‑influenced days in June 2023, which reduced the design value from 0.072 ppm to 0.070 ppm.
No New Burdens on Small Businesses
EPA certified that this proposed determination is a factual finding and "will not have a significant economic impact on a substantial number of small entities" under the Regulatory Flexibility Act and will not impose new requirements on small entities. The proposed rulemaking does not create new regulatory obligations for businesses.
Opportunity to Comment on Wildfire Data Exclusion
EPA proposes to take final action on LMAPCD's exceptional events request that excluded six days in June 2023 (Canadian wildfire influence) and is asking for public comments on that proposal. You may submit comments identified by Docket ID EPA-R04-OAR-2025-1443 by March 2, 2026; EPA will consider comments before finalizing the action.
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Key Dates
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