AQI 35 · Ozone · Trend: Stable
| Average AQI | 35 |
| Good Days / Year | 280 |
| Unhealthy Days / Year | 5 |
| Primary Pollutant | Ozone |
| PM2.5 Average | 6 µg/m³ |
| Trend | → Stable |
| Monitoring Stations | 15 |
| Nonattainment Areas | 1 |
Wyoming has generally good air quality due to its tiny population and persistent wind. The unique exception is the Upper Green River Basin, where oil and gas operations create winter ozone through a snow-reflection UV process found almost nowhere else in the world.
Wyoming DEQ Air Quality Division manages standards. Oil and gas emission permits. Winter ozone monitoring in the Upper Green River Basin.
Upper Green River Basin — ozone nonattainment (oil/gas winter ozone phenomenon). Wyoming's only nonattainment area is caused by a unique cold-weather ozone formation process.