Air Stagnation Advisory

URGENT - WEATHER MESSAGE
National Weather Service Boise ID
203 PM MST Wed Feb 4 2026

IDZ012-014-016-033-ORZ062>064-052200-
/O.CON.KBOI.AS.Y.0002.000000T0000Z-260209T1200Z/
Lower Treasure Valley-Upper Treasure Valley-Western Magic Valley-
Upper Weiser River-Baker County-Malheur County-Oregon Lower
Treasure Valley-
Including the cities of Nampa, Goodrich, Council, Twin Falls,
Caldwell, Mesa, Nyssa, Baker, Indian Valley, Boise, Fruitvale,
Malheur City, Ontario, Cambridge, and Glendale
203 PM MST Wed Feb 4 2026 /103 PM PST Wed Feb 4 2026/

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST /4 AM
PST/ MONDAY...

* 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 continue to trap pollutants.

* WHERE...Portions of south central and southwest Idaho and
  northeast and southeast Oregon.

* WHEN...Until 5 AM MST /4 AM PST/ Monday.

* 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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