In effect from Tuesday, Feb 03 2026 1:39 AM - Monday, Feb 09 2026 5:00 AM
Issued by NWS Boise ID
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.
Instructions: Persons with respiratory illness should follow their physicians
advice for dealing with high levels of air pollution during periods
of stagnant air.
Areas Impacted:
Lower Treasure Valley
Upper Treasure Valley
Western Magic Valley
Upper Weiser River
Baker County
Malheur County
Oregon Lower Treasure Valley
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Air Stagnation Advisory
In effect from Tuesday, Feb 03 2026 4:00 AM - Friday, Feb 06 2026 4:00 PM
Issued by NWS Portland OR
What:
Light winds and limited air movement will lead to a period
of stagnant air conditions.
Where:
South Willamette Valley, Foothills of the Northern and
Central Oregon Cascades, Lower Columbia River and Cowlitz River
Valleys, East Central Willamette Valley, and North Clark County
Lowlands.
When:
From 4 AM Tuesday to 4 PM PST Friday.
Impacts:
Deteriorating air quality may cause issues for people
with respiratory problems.
Instructions: State air quality agencies highly recommend that no outdoor burning
occur and that residential wood burning devices be limited as much
as possible. According to state air quality agencies, prolonged
periods of stagnant air can hold pollutants close to the ground
where people live and breathe. Check with your local burn agency for
any current restrictions in your area.
People with respiratory illness should follow their physician's
advice for dealing with high levels of air pollution during periods
of stagnant air, especially if an Air Quality Alert is in effect for
your area. To see if an Air Quality Alert is in effect for your
area, go to www.weather.gov/pqr and left-click your location on the
homepage map display. Alternatively, you could also type your
location into the search bar found on the top-left hand side of the
homepage. From there, you will see an Air Quality Alert listed at
the top if one is in effect for your location; you can click the
alert to read more details if applicable.
