Outdoor
Current values look suitable for ordinary outdoor activity for most people.
Why: Low AQI and low pollutant levels support this guidance.
Seattle, Washington, United States
Seattle air quality today
Current values look suitable for ordinary outdoor activity for most people.
Data: Current Open-Meteo model estimate
Practical guidance
Running
Current values look suitable for an easy outdoor run.
Why: Low AQI and low pollutant levels support this guidance.
Ventilation
Current values support brief ventilation.
Why: Low AQI and low pollutant levels support brief ventilation.
Air quality and outdoor metrics
US AQI
Air Quality Index
31
Good
PM2.5
Fine particulate matter
4.4µg/m³
Low
PM10
Coarse particulate matter
5.7µg/m³
Low
NO₂
Nitrogen dioxide
8µg/m³
Low
O₃
Ozone
59µg/m³
Low
UV index
Sun exposure level
0
Low
Temperature
Air temperature
14°C
Comfortable
Feels like
Apparent temperature
13°C
Comfortable
Wind
Wind speed
4km/h
Light
Humidity
Relative humidity
77%
Humid
Share page
Disclaimer
This information is a general estimate only and is not medical advice.
Location
Seattle, United States
Coordinates: 47.6062, -122.3321 · America/Los_Angeles
Interpret AQI for outdoor activity
Calculic's European AQI calculator assesses the value using your population group and planned activity intensity.
Interpret AQI in CalculicThis page's European AQI value, city and timestamp are passed to the calculator through the link.
What affects air quality in Seattle
For the Puget Sound region that includes Seattle, the Puget Sound Clean Air Agency identifies wood smoke, diesel exhaust and wildfire smoke as significant particle-pollution sources.
This is regional source context and does not say that any one source is affecting Seattle now.
Local monitoring and context
The Puget Sound Clean Air Agency says its regional core monitoring network measures multiple pollutants and includes a PM2.5 monitor at every site serving the region around Seattle.
The regional network measures combined pollution at individual sites; it is not the current-data provider for this page and no one site represents all of Seattle.
City air quality FAQ
How should I read the AQI for Seattle?
US AQI condenses air quality into one value. On this page, it helps you quickly judge whether conditions look good, moderate or more polluted than usual.
Is the air quality good for going outside?
Check the outdoor and running cards first. They combine AQI, particles, ozone, weather and other factors that can affect outdoor comfort.
Should I ventilate right now?
The ventilation card considers AQI and pollutants such as particles, nitrogen dioxide and ozone. If values are elevated, a shorter opening or a later moment may be better.
Why can air quality change during the day?
Weather, emissions, ozone formation, particles and air flow can shift local conditions, so the next hours can differ from the current reading.
Sources and methodology
Current data
This page uses US AQI.
Current and hourly air-quality values are CAMS-based model estimates, not measurements from a local monitoring station. They may not reflect street-level conditions.
- Displayed state
- Current model estimate
- Data time
- 2 Sept 2026, 09:00 pm
- Data source
- Open-Meteo
Evergreen city statements
Each local statement is linked to a checked primary-authority source. A source check is editorial provenance and does not describe current-data freshness.
Local sources support the background claims below; they are not the source of the current data shown above unless explicitly stated otherwise.
Authoritative sources for local statements
Cumulative Impacts — Monitoring
Puget Sound Clean Air Agency
- Scope
- Puget Sound region
- Source checked
- 22 Aug 2026
Names wood smoke, diesel exhaust and wildfire smoke as significant sources and explains the core network's pollutant and PM2.5 coverage.
Applicability: Four-county regional monitoring and source context; station results are site-specific and separate from this page's current model data.
Based on this source: For the Puget Sound region that includes Seattle, the Puget Sound Clean Air Agency identifies wood smoke, diesel exhaust and wildfire smoke as significant particle-pollution sources.
The Puget Sound Clean Air Agency says its regional core monitoring network measures multiple pollutants and includes a PM2.5 monitor at every site serving the region around Seattle.