Air Stagnation Advisory

URGENT - WEATHER MESSAGE
National Weather Service Boise ID
1221 PM MST Mon Dec 29 2025

IDZ012-014-016-028-033-ORZ061>064-301300-
/O.CON.KBOI.AS.Y.0005.000000T0000Z-260101T1700Z/
Lower Treasure Valley-Upper Treasure Valley-Western Magic Valley-
Camas Prairie-Upper Weiser River-Harney County-Baker County-
Malheur County-Oregon Lower Treasure Valley-
Including the cities of Malheur City, Burns, Baker, Caldwell,
Ontario, Fairfield, Nyssa, New Princeton, Mesa, Boise, Buchanan,
Soldier, Goodrich, Hill City, Fruitvale, Selby, Indian Valley,
Nampa, Venator, Dunnean, Crane, Diamond, Twin Falls, Council,
Glendale, Cambridge, Blaine, and Corral
1221 PM MST Mon Dec 29 2025 /1121 AM PST Mon Dec 29 2025/

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM MST /9 AM
PST/ THURSDAY...

* 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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Persons with respiratory illness should follow their physicians
advice for dealing with high levels of air pollution during periods
of stagnant air.

&&

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