Maine Air Quality

Real-time AQI data and air quality trends for 66 cities across Maine.

Statewide Air Quality Overview

36
Average AQI
2698
Good Air Days
393
Moderate Days
Unhealthy Days
169
Highest AQI

Based on 2025 EPA data

Cleanest Air in Maine

1. BrewerMedian AQI: 34
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2. MattawamkeagMedian AQI: 34
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3. BangorMedian AQI: 34
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4. VeazieMedian AQI: 34
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5. PattenMedian AQI: 34
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Most Polluted in Maine

1. North WindhamMedian AQI: 39
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2. WestbrookMedian AQI: 39
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3. South PortlandMedian AQI: 39
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4. Littlejohn IslandMedian AQI: 39
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5. Northeast HarborMedian AQI: 37
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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 Maine.
National Rankings
Compare Maine cities to the rest of the US by air quality grade and median AQI.

All Cities in Maine

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