{"data":{"id":"us/40-cfr-1090.305","jurisdiction":"us","citation":"40 CFR 1090.305","heading":"ULSD standards.","body":"(a) Overview. Except as specified in § 1090.300(a), all diesel fuel (including nonpetroleum diesel fuel) must meet the ULSD per-gallon standards of this section.\n(a) Overview. Except as specified in § 1090.300(a), diesel fuel must meet the ULSD per-gallon standards of this section.\n(b) Sulfur standard. Maximum sulfur content of 15 ppm.\n(c) Cetane index or aromatic content. Diesel fuel must meet one of the following standards:\n(1) Minimum cetane index of 40.\n(2) Maximum aromatic content of 35 volume percent.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER U—AIR POLLUTION CONTROLS","PART 1090—REGULATION OF FUELS, FUEL ADDITIVES, AND REGULATED BLENDSTOCKS","Subpart D—Diesel Fuel and ECA Marine Fuel Standards"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"fe5aa799dd07b11a4c297e1926f1a93739043bb19330a8aa54c3d5aa7a6d0096","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-1090.300","next":"us/40-cfr-1090.310"},"notice":"GroundRules: Original legal text. Not legal advice."}