SmogRank / Countries / United States / Delaware
Most polluted cities in Delaware, United States
4 measured cities ranked by PM2.5, this year. Worst: Wilmington at 9.0 µg/m³, #967 in the world.
| # | City | µg/m³ | |
|---|---|---|---|
| 1 | Wilmington Delaware | 9.0 | |
| 2 | Dover Delaware | 8.9 | |
| 3 | Bear Delaware | 8.1 | |
| 4 | Newark Delaware | 8.1 |
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data
Estimated: cities without a monitor
Delaware 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 |
|---|---|
| Middletown estimated | ≈ 3 µg/m³ |
Updated 2026-10-01 09:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.