Air quality in Chesterfield, estimated
Missouri, United States. No ground monitor we can use is in this city, so these numbers are model estimates, not measurements.
≈9µg/m³
Moderate, estimated
Estimated PM2.5, 7-day average to 2026-09-30, about 0.6× the WHO 24-hour guideline. 30-day average ≈ 10 µg/m³.
Model estimate from the Copernicus Atmosphere Monitoring Service (CAMS), scaled by 1.02 to match 10 measured cities within 300 km over the last week. Adjusted this way, a single day lands within ×1.5 of what a monitor would read about two times in three: a guide, not a measurement. Not ranked on SmogRank's boards.
Last 30 days, estimated
Measured cities nearby
| City | Distance | 7-day average |
|---|---|---|
| University City | 23 km | 6.0 µg/m³ |
| Lemay | 30 km | 9.4 µg/m³ |
| Arnold | 31 km | 6.6 µg/m³ |
| St. Louis | 33 km | 8.0 µg/m³ |
| East Saint Louis | 37 km | 7.6 µg/m³ |
| Granite City | 37 km | 6.9 µg/m³ |
Estimates contain modified Copernicus Atmosphere Monitoring Service information 2026. How estimates are made.