The highest AQ index in Montana (as of 23:00 MST) is currently the Libby area. Particle Pollution (PM2.5) is measuring at 98 (Moderate). This means air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
| Range | 0 - 50 | 51 - 100 | 101 - 150 | 151 - 200 | 201 - 300 | 301 - 500 |
| Color | ||||||
| Category | Good | Moderate | Unhealthy for Sensitive Groups | Unhealthy | Very Unhealthy | Hazardous |
Last Updated 14 minutes ago
Below is a list of counties in Montana. Click on any county below and you'll get a list of cities where we provide AQ index forecasts.