Colorado Air Quality

Real-time AQI data and air quality trends for 477 cities across Colorado.

Statewide Air Quality Overview

39
Average AQI
4450
Good Air Days
2149
Moderate Days
Unhealthy Days
652
Highest AQI

Based on 2025 EPA data

Cleanest Air in Colorado

1. WaldenMedian AQI: 3
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2. SilvertonMedian AQI: 4
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3. Snowmass VillageMedian AQI: 21
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4. PlacervilleMedian AQI: 21
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5. NorwoodMedian AQI: 21
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Most Polluted in Colorado

1. CatherineMedian AQI: 44
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2. No NameMedian AQI: 44
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3. ChacraMedian AQI: 44
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4. SiltMedian AQI: 44
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5. Pagosa SpringsMedian AQI: 32
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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 Colorado.
National Rankings
Compare Colorado cities to the rest of the US by air quality grade and median AQI.

All Cities in Colorado

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