Washington Air Quality

Real-time AQI data and air quality trends for 633 cities across Washington.

Statewide Air Quality Overview

27
Average AQI
6216
Good Air Days
863
Moderate Days
Unhealthy Days
151
Highest AQI

Based on 2025 EPA data

Cleanest Air in Washington

1. WishramMedian AQI: 14
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2. BickletonMedian AQI: 14
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3. Trout LakeMedian AQI: 14
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4. LyleMedian AQI: 14
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5. DallesportMedian AQI: 14
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Most Polluted in Washington

1. OthelloMedian AQI: 19
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2. MontesanoMedian AQI: 19
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3. Port TownsendMedian AQI: 19
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4. GraylandMedian AQI: 19
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5. CosmopolisMedian AQI: 19
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Learn About Air Quality

What Is the AQI?
Understand how the Air Quality Index is calculated and what each level means for your health.
Pollutant Guide
Learn about PM2.5, ozone, and other pollutants that affect air quality across Washington.
National Rankings
Compare Washington cities to the rest of the US by air quality grade and median AQI.

All Cities in Washington

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