Denver vs Fort Collins Air Quality Comparison
Which city has cleaner air right now, from the latest EPA AirNow AQI
As of September 23, 2026, Fort Collins, CO has cleaner air than Denver, CO — AQI 43 (Good) vs 55 (Moderate), a gap of 12 AQI points in the latest EPA AirNow observations. Lower AQI means cleaner air. Denver's reading is driven by PM10 and Fort Collins's by PM2.5.
Denver, CO
Moderate
Fort Collins, CO
Good
Summary
Fort Collins has 12 points better air quality
Fort Collins has an AQI of 43 compared to 55
Extra Protection for Denver Homes
Air quality in Denver is moderate (AQI 55), with particle pollution the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
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