US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 1066 — VEHICLE-TESTING PROCEDURESSubpart J — Evaporative Emission Test Procedures1066.95540 C.F.R. § 1066.955Diurnal emission test.Last amended: 2016Year: 2026Length: 11 wordsOfficial source Cite as 40 C.F.R. § 1066.955 (2026)Test vehicles for diurnal emissions as described in 40 CFR 86.133-96.Cross-references to the CFR40:86.133-96.Previous40 C.F.R. § 1066.950Next40 C.F.R. § 1066.960