Worst air pollution Sammamish, today and tomorrow
Today (15 July): Air quality in Sammamish is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 7:00 AM (O3: 52.9/100).
Tomorrow (16 July 2026): Air quality in Sammamish is medium. All pollutants stay as today. Pollution peaks around 4:00 AM (O3: 51.8/100). 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 - 15 July | Pollution peaks at 07:00
AQI:
Medium
52.9/100
PM2.5 (fine particles):
Good
11.7/100
PM10 (coarse particles):
Good
4.2/100
NO2 (nitrogen dioxide):
Good
14.4/100
O3 (ozone):
Medium
52.9/100
SO2 (sulfur dioxide):
Good
0.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.5/100
PM1 (ultrafine particles):
Good
14.4/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 04:00
AQI:
Medium
51.8/100
PM2.5 (fine particles):
Good
10.0/100
PM10 (coarse particles):
Good
3.5/100
NO2 (nitrogen dioxide):
Good
10.0/100
O3 (ozone):
Medium
51.8/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
11.5/100
PM1 (ultrafine particles):
Good
12.2/100
Pollen forecast in Sammamish
View pollen forecastSports venues in Sammamish
Frequently Asked Questions
Is air quality bad in Sammamish right now?
On 15 July 2026, overall air quality in Sammamish is medium. AQI is the main air quality indicator at 52.9/100. Pollution peaks around 7:00 AM (O3: 52.9/100).
Will air quality be worse tomorrow in Sammamish?
On 16 July 2026, air quality conditions in Sammamish will be similar to today, with AQI forecast at medium at 51.8/100. Pollution peaks around 4:00 AM (O3: 51.8/100).
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.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app