Rockford vs Peoria Air Quality Comparison
Which city has cleaner air right now, from the latest EPA AirNow AQI
As of September 23, 2026, Peoria, IL has cleaner air than Rockford, IL — AQI 30 (Good) vs 31 (Good), a gap of 1 AQI points in the latest EPA AirNow observations. Lower AQI means cleaner air. Rockford's reading is driven by O3 and Peoria's by O3.
Rockford, IL
Good
Peoria, IL
Good
Summary
Peoria has 1 points better air quality
Peoria has an AQI of 30 compared to 31
Reduce Indoor Ozone in Rockford
Today's main pollutant in Rockford is ground-level ozone (AQI 31). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Compare activated-carbon purifiers (for gases & ozone):
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