What is the air quality in Fort Collins CO?

Fort Collins CO, United States of America has an annual US AQI of 47 (Reasonable) and average PM2.5 of 7 µg/m³, ranking #538 of 5856 cities. Main pollutant: O3.

What is the cleanest month in Fort Collins CO?

November is typically the cleanest month (AQI 40) and July the most polluted (AQI 61).

Where does Fort Collins CO's air quality data come from?

PM2.5: 1998–2026 (monitors 1999–2026, satellite 1998–1999, 2002, 2004, 2011–2012; 2026 provisional (AirNow)). Measured by government monitoring stations. Full sources are on the methodology page.

Fort Collins CO, United States of America — Air Quality & Clean City Guide 2026

Fort Collins CO Air Quality Data

Global rank	City	Continent	AQI	PM2.5
538	Fort Collins CO, United States of America	North America	AQI 47	PM2.5 7 µg/m³