SmogRank / Countries / United States / Maryland
Most polluted cities in Maryland, United States
9 measured cities ranked by PM2.5, last 7 days. Worst: Hunt Valley at 4.7 µg/m³, #1921 in the world.
| # | City | µg/m³ | |
|---|---|---|---|
| 1 | Hunt Valley Maryland | 4.7 | |
| 2 | Baltimore Maryland | 4.6 | |
| 3 | Edgewood Maryland | 4.1 | |
| 4 | Elkton Maryland | 3.3 | |
| 5 | Hagerstown Maryland | 3.3 | |
| 6 | Scaggsville Maryland | 3.1 | |
| 7 | Oxon Hill-Glassmanor Maryland | 2.4 | |
| 8 | Rockville Maryland | 2.0 | |
| 9 | South Laurel Maryland | 1.9 |
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
Maryland 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 |
|---|---|
| Columbia estimated | ≈ 3 µg/m³ |
| Germantown estimated | ≈ 3 µg/m³ |
| Silver Spring estimated | ≈ 4 µg/m³ |
| Frederick estimated | ≈ 3 µg/m³ |
| Waldorf estimated | ≈ 4 µg/m³ |
| Glen Burnie estimated | ≈ 3 µg/m³ |
| Gaithersburg estimated | ≈ 3 µg/m³ |
| Ellicott City estimated | ≈ 3 µg/m³ |
| Dundalk estimated | ≈ 4 µg/m³ |
| Bethesda estimated | ≈ 4 µg/m³ |
| Bowie estimated | ≈ 4 µg/m³ |
| Towson estimated | ≈ 3 µg/m³ |
| Aspen Hill estimated | ≈ 3 µg/m³ |
| Wheaton estimated | ≈ 3 µg/m³ |
| Bel Air South estimated | ≈ 4 µg/m³ |
| Gwynn Oak estimated | ≈ 4 µg/m³ |
| Potomac estimated | ≈ 3 µg/m³ |
| Severn estimated | ≈ 3 µg/m³ |
| North Bethesda estimated | ≈ 3 µg/m³ |
| Catonsville estimated | ≈ 3 µg/m³ |
| Annapolis estimated | ≈ 3 µg/m³ |
| Hanover estimated | ≈ 3 µg/m³ |
| Woodlawn estimated | ≈ 4 µg/m³ |
| Severna Park estimated | ≈ 3 µg/m³ |
| Odenton estimated | ≈ 3 µg/m³ |
| Saint Charles estimated | ≈ 4 µg/m³ |
| Clinton estimated | ≈ 4 µg/m³ |
| Olney estimated | ≈ 3 µg/m³ |
| Suitland-Silver Hill estimated | ≈ 4 µg/m³ |
| Chillum estimated | ≈ 4 µg/m³ |
| St. Charles estimated | ≈ 4 µg/m³ |
| Salisbury estimated | ≈ 4 µg/m³ |
| Randallstown estimated | ≈ 5 µg/m³ |
| College Park estimated | ≈ 4 µg/m³ |
| Montgomery Village estimated | ≈ 3 µg/m³ |
| Pikesville estimated | ≈ 4 µg/m³ |
| Parkville estimated | ≈ 4 µg/m³ |
| Owings Mills estimated | ≈ 3 µg/m³ |
| Bel Air North estimated | ≈ 4 µg/m³ |
| Eldersburg estimated | ≈ 3 µg/m³ |
Updated 2026-10-01 05:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.