Worst air pollution The Dalles, today and tomorrow
Today (9 August): Air quality in The Dalles is fair. O3 is fair; AQI and NO2 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 PM (NO2: 52.8/100).
Tomorrow (10 August 2026): Air quality in The Dalles is fair. PM2.5 increases to fair; all other pollutants stay as today. Pollution peaks around 2:00 PM (NO2: 59.7/100). 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 The Dalles is driven mostly by Columbia River Gorge regional air — strong gorge winds generally keep air quality favorable. The Dalles doesn't see much year-to-year variation in this basic pattern, though individual weeks can differ. Local topography and prevailing winds both play a role in how quickly conditions change.
Today - 9 August | Pollution peaks at 22:00
AQI:
Medium
52.8/100
PM2.5 (fine particles):
Good
18.5/100
PM10 (coarse particles):
Good
12.1/100
NO2 (nitrogen dioxide):
Medium
52.8/100
O3 (ozone):
Fair
37.5/100
SO2 (sulfur dioxide):
Good
5.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.7/100
PM1 (ultrafine particles):
Good
12.9/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 14:00
AQI:
Medium
59.7/100
PM2.5 (fine particles):
Fair
23.4/100
PM10 (coarse particles):
Good
15.2/100
NO2 (nitrogen dioxide):
Medium
59.7/100
O3 (ozone):
Fair
35.9/100
SO2 (sulfur dioxide):
Good
4.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.8/100
PM1 (ultrafine particles):
Good
18.4/100
Pollen forecast in The Dalles
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in The Dalles
Frequently Asked Questions
Is air quality bad in The Dalles right now?
On 9 August 2026, overall air quality in The Dalles is fair. O3 is the main pollutant at 37.5/100. Pollution peaks around 10:00 PM (NO2: 52.8/100).
Will air quality be worse tomorrow in The Dalles?
On 10 August 2026, air quality conditions in The Dalles will be similar to today, with O3 forecast at fair at 35.9/100. Pollution peaks around 2:00 PM (NO2: 59.7/100).
When is air pollution at its worst in The Dalles?
Air quality across The Dalles rises and falls with the seasons: rain-heavy winters keep the air unusually clean compared to much of the country, but the driest weeks of late summer bring the greatest risk of smoke drifting in from regional wildfires. Prevailing onshore winds usually keep pollution moving rather than letting it settle.
Are air quality levels in The Dalles 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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