EPA Approves Cleveland Ozone Redesignation - 2015 NAAQS Attainment
EPA approved Ohio EPA’s request to redesignate the Cleveland, Ohio area to attainment for the 2015 ozone National Ambient Air Quality Standards (NAAQS), with the final rule published June 29, 2026. The rule took effect immediately on publication. Ohio EPA submitted the redesignation request on December 8, 2025. As part of the same action, EPA approved a revision to the Ohio State Implementation Plan (SIP) incorporating the state’s maintenance plan for the 2015 ozone standard through 2038 in the Cleveland area.
What the Redesignation Covers
The Cleveland area had been classified as a Serious nonattainment area under the 2015 ozone NAAQS. The redesignation to attainment reflects EPA’s finding that the area meets the statutory requirements under the Clean Air Act (CAA) for that change. EPA also found adequate and approved the newly established 2032 and 2038 motor vehicle emissions budgets for the area as part of the maintenance plan approval.
The approved maintenance plan commits Ohio to keeping the Cleveland area in attainment through 2038. That plan is now a SIP revision, meaning its emissions control measures carry federal enforceability.
How This Affects Ohio Permitting and Site Work
New Source Review and Air Permitting
Redesignation from nonattainment to attainment changes the applicable New Source Review (NSR) requirements for major stationary sources in the Cleveland area. Facilities that were subject to Nonattainment NSR (NNSR) requirements for ozone precursors - nitrogen oxides (NOx) and volatile organic compounds (VOCs) - will now fall under Prevention of Significant Deterioration (PSD) review for those pollutants. If you work on air permitting for industrial clients in the Cleveland area, confirm which NSR pathway applies to any pending or upcoming permit applications.
SIP Revision and Maintenance Obligations
The maintenance plan runs through 2038 and is now federally enforceable as a SIP revision. Ohio EPA retains authority to implement and enforce the emissions controls that support attainment. Any future rulemaking that relaxes those controls would require a SIP amendment and EPA approval.
Transportation Conformity
Federal transportation and other federally funded projects in the Cleveland area are subject to transportation conformity requirements under the CAA. Redesignation and maintenance plan approval affect how conformity determinations are made. Project teams working on federally funded infrastructure in the area should verify current conformity status with the applicable metropolitan planning organization and Ohio EPA’s Division of Air Pollution Control (DAPC).
Ohio note: Ohio EPA’s DAPC administers the SIP and handles air permit applications for the Cleveland area. For questions about how the redesignation affects a specific facility’s permit classification, contact DAPC directly. The Ohio Revised Code and Ohio Administrative Code (OAC) Chapter 3745-31 govern NSR permitting thresholds and procedures.
What to Watch
EPA’s approval is a final rule, but maintenance plan adequacy can be revisited if monitored ozone levels rise. If the Cleveland area records violations of the 2015 ozone NAAQS before 2038, EPA can reclassify it as nonattainment, which would reimpose NNSR requirements. Monitoring data from Ohio EPA’s ambient air network will be the leading indicator.
Bottom Line
The Cleveland area is now formally in attainment for the 2015 ozone NAAQS, and a federally enforceable maintenance plan runs through 2038. The immediate practical effect is a shift from NNSR to PSD review for major sources in the area. For consultants handling air permitting or environmental review for projects in the Cleveland region, confirm the applicable NSR pathway before submitting permit applications.