US lawWashingtonRegulationsTitle 173 — ECOLOGY, DEPARTMENT OFChapter 173-492 — MOTOR FUEL SPECIFICATIONS FOR OXYGENATED GASOLINE173-492-010WAC 173-492-010WAC 173-492-010. Policy and purposeLast amended: 1996Year: 2026Length: 23 wordsOfficial source The purpose of this regulation is to reduce carbon monoxide emissions from gasoline powered motor vehicles, through the wintertime use of oxygenated gasolines.NextWAC 173-492-020