What is the air quality in Greeley CO?

Greeley CO, United States of America has an annual US AQI of 51 (Reasonable) and average PM2.5 of 7.9 µg/m³, ranking #811 of 5856 cities. Main pollutant: O3.

What is the cleanest month in Greeley CO?

October is typically the cleanest month (AQI 43) and July the most polluted (AQI 70).

Where does Greeley CO's air quality data come from?

PM2.5: 1998–2026 (monitors 1999–2026, satellite 1998–1999, 2003–2004, 2006, 2008, 2012, 2014–2015; 2026 provisional (AirNow)). Measured by government monitoring stations. Full sources are on the methodology page.

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

Greeley CO Air Quality Data

Global rank	City	Continent	AQI	PM2.5
811	Greeley CO, United States of America	North America	AQI 51	PM2.5 7.9 µg/m³