While some localized smoke impacts from fires in the Cascades are still lingering, recent wet and cool weather has helped wind down this summer’s wildfire season. Looking back at air monitoring data, most areas of the state experienced at least one day of air quality that was “unhealthy for sensitive groups” (USG) or worse this summer. USG is a category on the Air Quality Index (AQI).
Coastal areas were the main exception, largely avoiding periods of unhealthy air quality. Central and Northeast Washington observed the most prolonged and extreme smoke impacts, largely due to their proximity to the season’s largest fires.
Most parts of the state saw unhealthy air quality this wildfire season. It was an especially smoky year for Chelan and Okanogan counties, as well as several counties in Northeastern Washington.
In the plot below, the black bars represent each county’s number of days with USG or worse air quality this year. The grey bars show each county’s highest number of smoky days (USG or worse) before 2026, with the year listed above each bar. While smoke is not unusual during Eastern Washington summers, a few counties saw their highest smoke exposure over the past 20 years.
Department of Ecology State of Washington
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