Worst air pollution Nampa, today and tomorrow
Today (20 September): Air quality in Nampa is moderate. AQI and NO2 are moderate; O3 is fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (NO2: 46.8/100).
Tomorrow (21 September 2026): Air quality in Nampa is moderate. All pollutants stay as today. Pollution peaks around 2:00 PM (NO2: 57.1/100). 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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Nampa's air quality reflects the Treasure Valley's partial topographic enclosure between the Owyhee Mountains and the Boise Foothills, sharing Boise's winter inversion challenge with vehicle emissions from I-84 and the surrounding agricultural and food processing industry contributing local sources. Summer wildfire smoke from Idaho and Oregon forests is an increasingly severe recurring concern, while winter temperature inversions can trap vehicle and agricultural emissions in the valley for extended periods.
Today - 20 September | Pollution peaks at 15:00
AQI:
Moderate
46.8/100
PM2.5 (fine particles):
Good
14.6/100
PM10 (coarse particles):
Good
9.5/100
NO2 (nitrogen dioxide):
Moderate
46.8/100
O3 (ozone):
Fair
36.9/100
SO2 (sulfur dioxide):
Good
0.4/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
5.1/100
PM1 (ultrafine particles):
Good
4.4/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 14:00
AQI:
Moderate
57.1/100
PM2.5 (fine particles):
Good
16.2/100
PM10 (coarse particles):
Good
10.1/100
NO2 (nitrogen dioxide):
Moderate
57.1/100
O3 (ozone):
Fair
31.9/100
SO2 (sulfur dioxide):
Good
0.6/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
5.6/100
PM1 (ultrafine particles):
Good
4.4/100
Pollen forecast in Nampa
View pollen forecastFrequently Asked Questions
Is air quality bad in Nampa right now?
On 20 September 2026, overall air quality in Nampa is moderate. AQI is the main air quality indicator at 46.8/100. Pollution peaks around 3:00 PM (NO2: 46.8/100).
Will air quality be worse tomorrow in Nampa?
On 21 September 2026, air quality conditions in Nampa will be similar to today, with AQI forecast at moderate at 57.1/100. Pollution peaks around 2:00 PM (NO2: 57.1/100).
When is air pollution at its worst in Nampa?
Nampa's air quality follows a clear seasonal pattern. Typically, a brief window in autumn tends to bring the year's best air, before winter inversions set in, while wildfire smoke drifting in from across the region is the main summer concern, while winter inversions can trap pollution locally. Valley and basin locations are especially prone to these winter inversion episodes compared to more exposed, higher terrain.
Are air quality levels in Nampa 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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 20 September 2026 at 14:33 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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