AQI 42 · PM2.5 · Trend: Variable (wildfires)
| Average AQI | 42 |
| Good Days / Year | 245 |
| Unhealthy Days / Year | 12 |
| Primary Pollutant | PM2.5 |
| PM2.5 Average | 7.2 µg/m³ |
| Trend | — Variable (wildfires) |
| Monitoring Stations | 42 |
| Nonattainment Areas | 0 |
Washington's air quality is generally excellent thanks to rain and ocean winds on the west side. However, wildfire smoke has become the defining air quality issue, with August and September sometimes bringing hazardous conditions. Eastern Washington has agricultural dust and more wildfire exposure.
WA Ecology Air Quality Program manages standards. Puget Sound Clean Air Agency has regional authority. Wood stove regulations. Marine vessel emission requirements.
No current nonattainment areas, though Yakima has been near nonattainment. Puget Sound generally meets standards despite heavy marine traffic.