Worst air pollution Redmond, today and tomorrow
Today (9 August): Air quality in Redmond is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 5:00 AM (O3: 37.8/100).
Tomorrow (10 August 2026): Air quality in Redmond is fair. All pollutants stay as today. Pollution peaks around 10:00 AM (O3: 24.8/100). 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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Redmond's air quality in Washington State benefits from the Sammamish River valley position in the greater Seattle metropolitan area east of Lake Washington, with vehicle emissions from SR-520 and SR-202 and the surrounding Microsoft and technology campus contributing local sources. Summer wildfire smoke from Washington and Oregon forests is an increasingly severe seasonal concern, while the lake and valley provide some ventilation and the technology campus character maintains moderate emission levels.
Today - 9 August | Pollution peaks at 05:00
AQI:
Fair
37.8/100
PM2.5 (fine particles):
Good
8.5/100
PM10 (coarse particles):
Good
6.6/100
NO2 (nitrogen dioxide):
Good
2.3/100
O3 (ozone):
Fair
37.8/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.3/100
PM1 (ultrafine particles):
Good
4.4/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 10:00
AQI:
Fair
24.8/100
PM2.5 (fine particles):
Good
4.5/100
PM10 (coarse particles):
Good
3.0/100
NO2 (nitrogen dioxide):
Good
2.3/100
O3 (ozone):
Fair
24.8/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.1/100
PM1 (ultrafine particles):
Good
3.2/100
Pollen forecast in Redmond
View pollen forecastFrequently Asked Questions
Is air quality bad in Redmond right now?
On 9 August 2026, overall air quality in Redmond is fair. AQI is the main air quality indicator at 37.8/100. Pollution peaks around 5:00 AM (O3: 37.8/100).
Will air quality be worse tomorrow in Redmond?
On 10 August 2026, air quality conditions in Redmond will be similar to today, with AQI forecast at fair at 24.8/100. Pollution peaks around 10:00 AM (O3: 24.8/100).
When is air pollution at its worst in Redmond?
Seasonal changes shape air quality across Redmond, as spring is often the freshest stretch, sandwiched between winter rain and summer fire season; by contrast, August and September wildfire smoke can dominate the season, occasionally driving particulate levels sharply higher for several days. Prevailing onshore winds usually keep pollution moving rather than letting it settle.
Are air quality levels in Redmond 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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