Seattle air quality today
Air quality in Seattle is currently moderate, with a European index of 54. The concentration of PM2.5 particles is 13 µg/m³ and PM10 is 13 µg/m³. Very sensitive people may notice mild symptoms during prolonged outdoor exertion. Over the next 24 hours the air will be cleanest around 2:00 PM (index 34) and most polluted around 9:00 PM (index 61).
Current air quality in Seattle
Moderate
54EAQI
Very sensitive people may notice mild symptoms during prolonged outdoor exertion.
- PM2.5
- 13 µg/m³
- PM10
- 13 µg/m³
- Ozone
- 15 µg/m³
Model estimate (Open-Meteo / CAMS) for the city location. It may differ from readings at local stations.
The next 24 hours at a glance
- Index now
- 54
- Moderate
- Average index
- 48
- Moderate
- Cleanest air
- 2:00 PM
- index 34
- Most polluted hour
- 9:00 PM
- index 61
- PM2.5
- 13 µg/m³
- PM10
- 13 µg/m³
Air quality in Seattle by the hour
- 54Now
- 5411 PM
- 5312 AM
- 521 AM
- 502 AM
- 493 AM
- 494 AM
- 485 AM
- 496 AM
- 507 AM
- 508 AM
- 489 AM
- 4610 AM
- 4311 AM
- 4112 PM
- 361 PM
- 342 PM
- 353 PM
- 404 PM
- 435 PM
- 486 PM
- 557 PM
- 608 PM
- 619 PM
European Air Quality Index (EAQI) by the hour, a model estimate. A shorter bar means cleaner air.
Pollen in Seattle
Pollen data is not available for this location. The pollen model only covers Europe.
Frequently asked questions
How is the air quality in Seattle today?
It is currently moderate (European index 54). PM2.5 is 13 µg/m³, PM10 is 13 µg/m³ and ozone is 15 µg/m³. The average for the next 24 hours is around 48.
What does the European Air Quality Index (EAQI) mean?
The EAQI is a scale used by the European Environment Agency. Up to 20 is excellent air, up to 40 good, up to 60 moderate, up to 80 poor, up to 100 very poor, and above 100 extremely poor. The index is calculated from the concentration of fine particles (PM2.5 and PM10), ozone, nitrogen dioxide and sulphur dioxide.
What are PM2.5 and PM10 particles?
They are tiny particles in the air with a diameter of up to 2.5 and 10 micrometres. They come from traffic, heating and industry, and there are the most of them in winter, on calm days without wind or rain. PM2.5 is more dangerous because it penetrates deep into the lungs.
Are these measurements or estimates?
This is an atmospheric model estimate (Open-Meteo / CAMS) for the city location, not a reading from a local station. Values may therefore differ from station data in some parts of the city.
When is the air cleanest?
The air is usually cleaner during stronger winds, after rain and in the afternoon, when the cold layer near the ground breaks up. It is worst early in the morning and in the evening in the cold part of the year, when heating and traffic increase.