Worst air pollution Sammamish, today and tomorrow
Today (9 August): Air quality in Sammamish 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 Sammamish 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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Sammamish's air quality benefits from its Sammamish Plateau position east of Seattle, with vehicle emissions from SR-228 the primary local source in this affluent King County suburb. The surrounding Cascade foothills and the Sammamish Lake provide some topographic variation and local ventilation, while summer wildfire smoke from Washington and Oregon forests is an increasingly severe seasonal concern and the plateau position generally maintains better conditions than the lower Seattle urban valley floor.
Today - 9 August | Pollution peaks at 05:00
AQI:
Fair
37.8/100
PM2.5 (fine particles):
Good
8.8/100
PM10 (coarse particles):
Good
6.8/100
NO2 (nitrogen dioxide):
Good
3.1/100
O3 (ozone):
Fair
37.8/100
SO2 (sulfur dioxide):
Good
0.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.3/100
PM1 (ultrafine particles):
Good
4.5/100
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
4.7/100
PM10 (coarse particles):
Good
3.1/100
NO2 (nitrogen dioxide):
Good
3.1/100
O3 (ozone):
Fair
24.8/100
SO2 (sulfur dioxide):
Good
0.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.1/100
PM1 (ultrafine particles):
Good
3.3/100
Pollen forecast in Sammamish
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Frequently Asked Questions
Is air quality bad in Sammamish right now?
On 9 August 2026, overall air quality in Sammamish 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 Sammamish?
On 10 August 2026, air quality conditions in Sammamish 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 Sammamish?
Air quality across Sammamish rises and falls with the seasons, as spring is often the freshest stretch, sandwiched between winter rain and summer fire season; by contrast, 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 Sammamish 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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