US lawWashingtonRegulationsTitle 173 — ECOLOGY, DEPARTMENT OFChapter 173-420 — CONFORMITY OF TRANSPORTATION ACTIVITIES TO AIR QUALITY IMPLEMENTATION PLANS173-420-010WAC 173-420-010WAC 173-420-010. TitleLast amended: 1993Year: 2026Length: 17 wordsOfficial source This chapter shall be known as the "Washington State Clean Air Conformity Act" hereinafter as "this chapter."NextWAC 173-420-020