Montana Air Quality by City

Montana has 4 cities with an air-quality page, from Billings (129,267 people) on down. Each page leads with the live AQI, the main pollutant driving it, and a go/no-go for outdoor exercise on the EPA scale.

Cities in Montana

4 cities with an air-quality page, largest first

CityTypical AQI (county median, 2025)Population
Billings38 Good129,267
Deer Lodge13 Good3,021
ColumbusNo EPA monitor2,003
Broadview38 Good175

Our dataset lists 495 places in Montana; the 4 above have a page. For a smaller town, the nearest city above is the closest match.