What is the air quality in Flagstaff AZ?

Flagstaff AZ, United States of America has an annual US AQI of 44 (Reasonable) and average PM2.5 of 4.8 µg/m³, ranking #398 of 5856 cities. Main pollutant: O3.

What is the cleanest month in Flagstaff AZ?

December is typically the cleanest month (AQI 33) and May the most polluted (AQI 56).

Where does Flagstaff AZ's air quality data come from?

PM2.5: 1998–2024 (monitors 2008, satellite 1998–2024). Measured by government monitoring stations. Full sources are on the methodology page.

Flagstaff AZ, United States of America — Air Quality & Clean City Guide 2026

Flagstaff AZ Air Quality Data

Global rank	City	Continent	AQI	PM2.5
398	Flagstaff AZ, United States of America	North America	AQI 44	PM2.5 4.8 µg/m³