SmogRank / Countries / United States / Missouri
Most polluted cities in Missouri, United States
10 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: St. Louis at 8.1 µg/m³, #602 in the world.
10 good
- 1St. Louis 8.1
- 2Lemay 7.7
- 3Columbialow-cost sensors 7.0
- 4Kansas City 6.8
- 5University City 6.7
- 6Springfield 6.5
- 7Arnold 6.4
- 8Saint Joseph 6.0
- 9Raymore 5.6
- 10Liberty 5.1
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+
Estimated: cities without a monitor
Missouri cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Independence | ≈ 8 µg/m³ |
| Lee's Summit | ≈ 7 µg/m³ |
| O'Fallon | ≈ 8 µg/m³ |
| Saint Charles | ≈ 9 µg/m³ |
| Blue Springs | ≈ 8 µg/m³ |
| Saint Peters | ≈ 8 µg/m³ |
| Florissant | ≈ 9 µg/m³ |
| Joplin | ≈ 8 µg/m³ |
| Chesterfield | ≈ 9 µg/m³ |
| Jefferson City | ≈ 7 µg/m³ |
| Cape Girardeau | ≈ 5 µg/m³ |
| Oakville | ≈ 9 µg/m³ |
| Wildwood | ≈ 8 µg/m³ |
| Wentzville | ≈ 8 µg/m³ |
| Ballwin | ≈ 9 µg/m³ |
| Raytown | ≈ 8 µg/m³ |
| Mehlville | ≈ 9 µg/m³ |
| Kirkwood | ≈ 9 µg/m³ |
| Maryland Heights | ≈ 9 µg/m³ |
| Gladstone | ≈ 8 µg/m³ |
| Hazelwood | ≈ 9 µg/m³ |
| Grandview | ≈ 7 µg/m³ |
| Webster Groves | ≈ 9 µg/m³ |
| Sedalia | ≈ 6 µg/m³ |
| Ferguson | ≈ 9 µg/m³ |
| Nixa | ≈ 6 µg/m³ |
| Affton | ≈ 9 µg/m³ |
| Rolla | ≈ 6 µg/m³ |
| Warrensburg | ≈ 6 µg/m³ |
| Spanish Lake | ≈ 9 µg/m³ |
| Old Jamestown | ≈ 9 µg/m³ |
| Ozark | ≈ 6 µg/m³ |
| Creve Coeur | ≈ 9 µg/m³ |
| Manchester | ≈ 9 µg/m³ |
| Farmington | ≈ 5 µg/m³ |
| Hannibal | ≈ 6 µg/m³ |
| Kirksville | ≈ 6 µg/m³ |
| Poplar Bluff | ≈ 5 µg/m³ |
| Sikeston | ≈ 5 µg/m³ |
| Concord | ≈ 9 µg/m³ |
Updated 2026-10-01 17:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.