US lawWashingtonRegulationsTitle 173 — ECOLOGY, DEPARTMENT OFChapter 173-476 — AMBIENT AIR QUALITY STANDARDS173-476-170WAC 173-476-170WAC 173-476-170. Monitor siting criteriaLast amended: 2013Year: 2026Length: 12 wordsOfficial source Ambient monitors must be sited as required in 40 C.F.R. Part 58.PreviousWAC 173-476-160NextWAC 173-476-180