AQI 55 · Ozone · Trend: Stable
| Average AQI | 55 |
| Good Days / Year | 195 |
| Unhealthy Days / Year | 15 |
| Primary Pollutant | Ozone |
| PM2.5 Average | 9 µg/m³ |
| Trend | → Stable |
| Monitoring Stations | 45 |
| Nonattainment Areas | 1 |
Colorado's Front Range faces persistent ozone problems from vehicle emissions, oil/gas operations, and high-altitude UV intensity. Western slope mountain communities have generally clean air but face growing wildfire smoke impacts.
CDPHE (Colorado Dept. of Public Health and Environment) Air Pollution Control Division enforces standards. Front Range ozone action plans, oil/gas emission regulations, and EV incentive programs.
Denver-Boulder-Greeley-Fort Collins area — ozone nonattainment. Front Range corridor is Colorado's primary air quality concern.