Seattle Good

Seattle, Washington

Updated: May 11, 2026, 11:00 AM

Good

Air quality is satisfactory, and air pollution poses little or no risk.

Current Weather

16.7°C

Temperature

71%

Humidity

mph wind

Clear sky

Conditions

Pollutant Breakdown

PM2.5

µg/m³ · Fine particles

—

PM10

µg/m³ · Coarse particles

—

Ozone

ppb · Ground-level ozone

13.7

NO₂

ppb · Nitrogen dioxide

—

SO₂

ppb · Sulfur dioxide

500

ppm · Carbon monoxide

Dominant pollutant: PM25

PM2.5 Forecast (next 7 days)

Sat

5/9

avg

Sun

5/10

avg

Mon

5/11

avg

Tue

5/12

avg

Wed

5/13

avg

Thu

5/14

avg

Fri

5/15

avg

Health Guidance

✅

General population: No restrictions. Enjoy outdoor activities.

✅

Sensitive groups: Air quality is good. Normal activities are fine.

💨

Keep windows closed if AQI is Unhealthy or above. Use HEPA air purifiers indoors.

Data from: Washington State Department of Ecology, Air Now - US EPA, World Air Quality Index Project

Is the air safe in Seattle today?

The current Air Quality Index (AQI) in Seattle is 8, which is classified as "Good". Air quality is satisfactory, and air pollution poses little or no risk.

The AQI scale runs from 0 to 500. Values of 0–50 are Good, 51–100 are Moderate, 101–150 are Unhealthy for Sensitive Groups, 151–200 are Unhealthy, 201–300 are Very Unhealthy, and 301–500 are Hazardous.

Air quality in Seattle, Washington is monitored by local environmental agencies and reported through the World Air Quality Index project. Data is updated hourly and includes PM2.5, PM10, ozone, nitrogen dioxide, sulfur dioxide, and carbon monoxide.

AQI Scale Reference

0–50

Good

51–100

Moderate

101–150

Unhealthy for Sensitive Groups

151–200

Unhealthy

201–300

Very Unhealthy

301+

Hazardous