US lawWashingtonRegulationsTitle 173 — ECOLOGY, DEPARTMENT OFChapter 173-476 — AMBIENT AIR QUALITY STANDARDS173-476-020WAC 173-476-020WAC 173-476-020. ApplicabilityLast amended: 2016Year: 2026Length: 32 wordsOfficial source (1) The provisions of this chapter apply to all areas of the state of Washington. (2) All federal regulations referenced in this regulation are adopted as they exist on January 1, 2016.PreviousWAC 173-476-010NextWAC 173-476-030