Today | Weather | Thursday, February 5, 2026

Active Weather Warnings

Air Stagnation Advisory

Weather in Caldwell, Idaho

06:34 PM

Now

45° F

Feels Like 41°

Precipitation 0 %

Wind 6 mph

Humidity 70 %

Today

Day 55°

Night 27°

Precipitation 0 %

Wind 4 mph

UV Index (0 - 11+) 3

Caldwell Weather Forecast Updated

Air Quality in Caldwell

NOW

56 AQI

Moderate air quality Dominant pollutant: PM_2.5

Pollutant Concentrations:

PM_2.5 14.65 µg/m³

PM₁₀ 18.85 µg/m³

O₃ 0.031 ppm

NO₂ 2 ppb

SO₂ 0 ppb

CO 0.17 ppm

NH₃ 5.08 µg/m³

NO 0 µg/m³

PM_2.5 – Fine particles <2.5μm

PM₁₀ – Inhalable particles <10μm

O₃ – Ozone

NO₂ – Nitrogen dioxide

SO₂ – Sulfur dioxide

CO – Carbon monoxide

NH₃ – Ammonia

NO – Nitric oxide

Health Recommendations:

Air quality is acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)

PM_2.5 – 14.65 µg/m³

PM₁₀ – 18.85 µg/m³

O₃ – 61.3 µg/m³

NO₂ – 3.69 µg/m³

SO₂ – 0.03 µg/m³

CO – 193.98 µg/m³

NH₃ – 5.08 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Caldwell

Moderate Expected Likely

Air Stagnation Advisory

Air Stagnation Advisory issued February 5 at 1:27PM MST until February 9 at 5:00AM MST by NWS Boise ID

Feb 5, 1:27 PM → Feb 9, 5:00 AM

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.

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

Updated: Feb 5, 5:01 PM Source: NWS Alert