Washington State Department of EcologyAir quality in most areas of Washington State is protected by local clean air agencies. Tribes protect and have authority over their tribal lands. Areas are based on county boundaries except for tribes where the boundary is the reservation. Ecology's regional offices have authority in all other areasArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/360a06af4f5c4d03b35fd54adc380ed4_0engState of Washington Geospatial Open Data PortalPublicAir Quality Authority Areas [Washington (State)]Web servicesWashington (State)Last Modified: 2025-12-29