AQI 52 · PM2.5 · Trend: Improving
| Average AQI | 52 |
| Good Days / Year | 205 |
| Unhealthy Days / Year | 10 |
| Primary Pollutant | PM2.5 |
| PM2.5 Average | 9.5 µg/m³ |
| Trend | ↓ Improving |
| Monitoring Stations | 32 |
| Nonattainment Areas | 1 |
Missouri's air quality is influenced by the St. Louis and Kansas City metro areas. The Mississippi River valley in St. Louis can trap pollution during inversions. The state is transitioning away from coal power, which should improve future air quality.
Missouri DNR Air Pollution Control Program manages standards. St. Louis metro vehicle emissions testing. Kansas City metro ozone monitoring.
St. Louis metro — PM2.5 and ozone nonattainment. Missouri's central location means it receives transported pollution from multiple directions.