CFR › Title 40 › Part 52 › §52.5640 CFR §52.56Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)The state implementation plan (SIP) revision submitted on June 21, 2022, addressing Clean Air Act section 110(a)(2)(D)(i)(I) (prongs 1 and 2) for the 2015 ozone national ambient air quality standards (NAAQS) is disapproved.(b)[Reserved]