The highest AQ index in Washington (as of 2026-10-19 09:19:06 GMT) is currently the area. () is measuring at (). This means
| Range | 0 - 50 | 51 - 100 | 101 - 150 | 151 - 200 | 201 - 300 | 301 - 500 |
| Color | ||||||
| Category | Good | Moderate | Unhealthy for Sensitive Groups | Unhealthy | Very Unhealthy | Hazardous |
Last Updated 19 minutes ago
Below is a list of counties in Washington. Click on any county below and you'll get a list of cities where we provide AQ index forecasts.