Outdoor
Current values look suitable for ordinary outdoor activity for most people.
Why: Low AQI, low particle levels and mild outdoor conditions support this guidance.
Seattle, United States
Seattle air quality today
Current values look suitable for ordinary outdoor activity for most people.
Air quality status: GoodUpdated (city local time): 18 Jul 2026, 02:00Data: Open-Meteo current data
Practical guidance
Running
Current values look suitable for an easy outdoor run.
Why: Low AQI, low particle levels and mild outdoor conditions 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
34
Good
PM2.5
Fine particulate matter
7.9µg/m³
Low
PM10
Coarse particulate matter
8.9µg/m³
Low
NO₂
Nitrogen dioxide
22µg/m³
Low
O₃
Ozone
25µg/m³
Low
UV index
Sun exposure level
0
Low
Pollen
Pollen availability
Not available
Not available
Temperature
Air temperature
15°C
Comfortable
Feels like
Apparent temperature
14°C
Comfortable
Wind
Wind speed
7km/h
Light
Humidity
Relative humidity
80%
Humid
Data source and license
Air quality and weather data provided by Open-Meteo. Air quality forecasts are based on CAMS air quality data. Values are general estimates and may not reflect street-level conditions.
Open-Meteo · Updated (city local time): 18 Jul 2026, 02:00
Some metrics from current data are unavailable: Pollen
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
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.
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.