Worst air pollution Alki Beach - Seattle, today and tomorrow
Today (15 July): Air quality in Alki Beach 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 Alki Beach 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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Seattle's Alki Beach records excellent air quality on West Seattle's beachfront, directly exposed to clean Puget Sound airflows with consistent onshore westerly winds providing outstanding maritime ventilation throughout most of the year. This is consistently one of Seattle's cleanest locations, with the open water fetch preventing any significant local pollutant accumulation.
Today - 15 July | Pollution peaks at 07:00
AQI:
Medium
52.9/100
PM2.5 (fine particles):
Good
12.0/100
PM10 (coarse particles):
Good
4.4/100
NO2 (nitrogen dioxide):
Good
17.6/100
O3 (ozone):
Medium
52.9/100
SO2 (sulfur dioxide):
Good
0.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.5/100
PM1 (ultrafine particles):
Good
14.8/100
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
10.2/100
PM10 (coarse particles):
Good
3.6/100
NO2 (nitrogen dioxide):
Good
12.3/100
O3 (ozone):
Medium
51.8/100
SO2 (sulfur dioxide):
Good
0.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
11.5/100
PM1 (ultrafine particles):
Good
12.5/100
Other Landmarks in Seattle
Sports venues in Seattle
Frequently Asked Questions
Is air quality bad in Alki Beach right now?
On 15 July 2026, overall air quality in Alki Beach 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 Alki Beach?
On 16 July 2026, air quality conditions in Alki Beach 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 Alki Beach?
Conditions at Alki Beach vary noticeably across the seasons. In short, spring is often the freshest stretch, sandwiched between winter rain and summer fire season, whereas late summer wildfire smoke is the biggest concern, sometimes pushing air quality into unhealthy territory for days at a stretch. Prevailing onshore winds usually keep pollution moving rather than letting it settle.
Are air quality levels in Alki Beach 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