Worst air pollution Grangeville, today and tomorrow
Today (9 August): Air quality in Grangeville is poor. AQI and NO2 are poor; PM2.5 and O3 are fair; PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 PM (NO2: 62.6/100).
Tomorrow (10 August 2026): Air quality in Grangeville is poor. PM10 increases to fair; PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 1:00 PM (NO2: 70.1/100). 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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Air quality in Grangeville is driven mostly by Columbia Basin regional air — wildfire smoke in late summer is the main recurring concern. That mix of factors is fairly representative of towns in this part of the country. Short-term spikes are still possible even during the generally cleaner stretches of the year.
Today - 9 August | Pollution peaks at 22:00
AQI:
Poor
62.6/100
PM2.5 (fine particles):
Fair
27.4/100
PM10 (coarse particles):
Good
19.5/100
NO2 (nitrogen dioxide):
Poor
62.6/100
O3 (ozone):
Fair
37.1/100
SO2 (sulfur dioxide):
Good
10.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
10.1/100
PM1 (ultrafine particles):
Good
18.8/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 13:00
AQI:
Poor
70.1/100
PM2.5 (fine particles):
Fair
29.9/100
PM10 (coarse particles):
Fair
20.2/100
NO2 (nitrogen dioxide):
Poor
70.1/100
O3 (ozone):
Fair
36.0/100
SO2 (sulfur dioxide):
Good
9.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.8/100
PM1 (ultrafine particles):
Fair
22.2/100
Pollen forecast in Grangeville
View pollen forecastFrequently Asked Questions
Is air quality bad in Grangeville right now?
On 9 August 2026, overall air quality in Grangeville is poor. AQI is the main air quality indicator at 62.6/100. Pollution peaks around 10:00 PM (NO2: 62.6/100).
Will air quality be worse tomorrow in Grangeville?
On 10 August 2026, air quality conditions in Grangeville will be similar to today, with AQI forecast at poor at 70.1/100. Pollution peaks around 1:00 PM (NO2: 70.1/100).
When is air pollution at its worst in Grangeville?
Air quality across Grangeville rises and falls with the seasons: a short stretch in late spring often brings the cleanest air, ahead of the summer smoke season, but both summer smoke and winter cold-air inversions bring recurring rough patches for local air quality. Higher-elevation, more exposed locations generally avoid the worst of the valley inversion episodes.
Are air quality levels in Grangeville 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: 9 August 2026 at 20:27 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.
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