Active AlertsLeavenworth, WA

What: Stagnant conditions will have potential to trap pollutants near the ground with deteriorated air quality.
Where: Portions of North and North Central Idaho and North Central, Northeast, and Southeast Washington.
When: Until noon PST Thursday.
Impacts: Periods of air stagnation can lead to the buildup of pollutants near the surface.

Buildup of fine pollution particles can be harmful to those sensitive to air pollution including people with lung and heart problems, people with diabetes, children and the elderly.