US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 52 — APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANSSubpart TT — Utah52.233140 C.F.R. § 52.2331Attainment dates for national standards.Last amended: 2016Year: 2026Length: 29 wordsOfficial source Cite as 40 C.F.R. § 52.2331 (2026)The attainment date for the secondary NAAQS for sulfur dioxide for Salt Lake County and portions of Tooele County is December 31, 1994. [61 FR 16062, Apr. 11, 1996]Previous40 C.F.R. § 52.2324Next40 C.F.R. § 52.2333