Illinois Air Quality

Real-time AQI data and air quality trends for 1,456 cities across Illinois.

Statewide Air Quality Overview

42
Average AQI
4022
Good Air Days
1650
Moderate Days
Unhealthy Days
260
Highest AQI

Based on 2025 EPA data

Cleanest Air in Illinois

1. WarrenMedian AQI: 35
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2. ShumwayMedian AQI: 35
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3. MenomineeMedian AQI: 35
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4. EdgewoodMedian AQI: 35
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5. Apple RiverMedian AQI: 35
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View All Rankings →

Most Polluted in Illinois

1. DorchesterMedian AQI: 37
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2. WilsonvilleMedian AQI: 37
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3. Mount OliveMedian AQI: 37
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4. BrightonMedian AQI: 37
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5. Lake Ka-HoMedian AQI: 37
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View All Rankings →

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 Illinois.
National Rankings
Compare Illinois cities to the rest of the US by air quality grade and median AQI.

All Cities in Illinois

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