Worst air pollution Caldwell, today and tomorrow
Today (16 July): Air quality in Caldwell is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (O3: 32.0/100).
Tomorrow (17 July 2026): Air quality in Caldwell is fair. All pollutants stay as today. Pollution peaks around 6:00 AM (O3: 29.1/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Caldwell's air quality reflects the Treasure Valley's partial topographic enclosure between the Owyhee Mountains and the Boise Foothills in Idaho, with vehicle emissions from I-84 and the surrounding agricultural processing and suburban development contributing local sources. Winter temperature inversions can trap emissions in the valley for extended periods, while summer wildfire smoke from surrounding Idaho and Oregon forests is an increasingly severe seasonal concern and agricultural dust from the surrounding Columbia Basin irrigated farming contributes PM10.
Today - 16 July | Pollution peaks at 08:00
AQI:
Fair
32.0/100
PM2.5 (fine particles):
Good
8.8/100
PM10 (coarse particles):
Good
5.6/100
NO2 (nitrogen dioxide):
Good
7.3/100
O3 (ozone):
Fair
32.0/100
SO2 (sulfur dioxide):
Good
1.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.3/100
PM1 (ultrafine particles):
Good
6.0/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 06:00
AQI:
Fair
29.1/100
PM2.5 (fine particles):
Good
7.5/100
PM10 (coarse particles):
Good
2.8/100
NO2 (nitrogen dioxide):
Good
10.7/100
O3 (ozone):
Fair
29.1/100
SO2 (sulfur dioxide):
Good
1.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.0/100
PM1 (ultrafine particles):
Good
5.4/100
Pollen forecast in Caldwell
View pollen forecastFrequently Asked Questions
Is air quality bad in Caldwell right now?
On 16 July 2026, overall air quality in Caldwell is fair. AQI is the main air quality indicator at 32.0/100. Pollution peaks around 8:00 AM (O3: 32.0/100).
Will air quality be worse tomorrow in Caldwell?
On 17 July 2026, air quality conditions in Caldwell will be similar to today, with AQI forecast at fair at 29.1/100. Pollution peaks around 6:00 AM (O3: 29.1/100).
When is air pollution at its worst in Caldwell?
Caldwell experiences a distinct seasonal swing in air quality. In short, a brief window in autumn tends to bring the year's best air, before winter inversions set in, whereas summer brings regional wildfire smoke, while winter brings its own inversion-driven pollution episodes. Valley and basin locations are especially prone to these winter inversion episodes compared to more exposed, higher terrain.
Are air quality levels in Caldwell based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app