The highest AQ index in Colorado (as of 23:00 MST) is currently the Greeley area. Particle Pollution (PM2.5) is measuring at 62 (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.
Over the next few days, the highest Ozone (OZONE) will be in the Rocky Mountain National Park area. It is forecasted to be Moderate, meaning 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 2 minutes ago
Below is a list of counties in Colorado. Click on any county below and you'll get a list of cities where we provide AQ index forecasts.