What is the air quality in Cheyenne WY?

Cheyenne WY, United States of America has an annual US AQI of 42 (Reasonable) and average PM2.5 of 4.4 µg/m³, ranking #309 of 5856 cities. Main pollutant: O3.

What is the cleanest month in Cheyenne WY?

November is typically the cleanest month (AQI 34) and July the most polluted (AQI 52).

Where does Cheyenne WY's air quality data come from?

PM2.5: 1998–2026 (monitors 1998–2026, satellite 1998–2002, 2005, 2007–2009, 2020; 2026 provisional (AirNow)). Measured by government monitoring stations. Full sources are on the methodology page.

Cheyenne WY, United States of America — Air Quality & Clean City Guide 2026

Cheyenne WY Air Quality Data

Global rank	City	Continent	AQI	PM2.5
309	Cheyenne WY, United States of America	North America	AQI 42	PM2.5 4.4 µg/m³