Air Stagnation Advisory issued December 29 at 11:23AM PST until January 1 at 12:00PM PST by NWS Missoula MT
Issue date: 2025-12-29T19:23+00:00
* WHAT...Stagnation conditions will trap pollutants, leading to deteriorating air quality. * WHERE...Lower Hells Canyon/Salmon River Region, Orofino/Grangeville Region, Southern Clearwater Mountains, and Northern Clearwater Mountains. * WHEN...Until noon PST Thursday. * IMPACTS...Periods of air stagnation can lead to the build up of pollutants near the surface.
