Air Stagnation Advisory issued December 29 at 2:25PM PST until December 31 at...
29 Dec 2025 at 3:25pm
* WHAT...Air quality is likely to worsen through Wednesday afternoon. This is due to an inversion and stagnant air conditions near the surface that will trap pollutants. * WHERE...Valley areas, both west of the Cascades in Jackson, Josephine and Douglas counties, and east of the Cascades in Klamath and Lake counties. * WHEN...Until 4 PM PST Wednesday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.

Air Stagnation Advisory issued December 29 at 12:03PM PST until January 1 at ...
29 Dec 2025 at 1:03pm
* WHAT...Stagnant conditions will have the potential to trap pollutants near the ground and deteriorate air quality. * WHERE...Foothills of the Blue Mountains of Oregon and Washington, Lower Columbia Basin of Oregon and Washington, North Central Oregon, Central Oregon, Kittitas Valley, and Yakima Valley. * WHEN...Until noon PST Thursday. * IMPACTS...Periods of air stagnation can lead to the buildup of pollutants near the surface, potentially leading to poor air quality.

Air Stagnation Advisory issued December 29 at 12:21PM MST until January 1 at ...
29 Dec 2025 at 12:21pm
* WHAT...An extended period of stagnant air, with light winds and little vertical mixing. This is due to an inversion near the surface that will trap pollutants in the valleys. * WHERE...Portions of south central and southwest Idaho and northeast and southeast Oregon. * WHEN...Until 10 AM MST /9 AM PST/ Thursday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.