SmogRank / Countries / United States / Maryland
Most polluted cities in Maryland, United States
7 measured cities, last 24 hours; 0 above the WHO 24-hour guideline. Worst: Baltimore at 8.9 µg/m³, #562 in the world.
7 good
- 1Baltimore 8.90.6×
- 2Scaggsville 8.00.5×
- 3Edgewood 6.10.4×
- 4Oxon Hill-Glassmanor 5.80.4×
- 5Hunt Valley 5.50.4×
- 6South Laurel 4.50.3×
- 7Hagerstown 3.80.3×
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
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 | ≈ 3 µg/m³ |
| Germantown | ≈ 3 µg/m³ |
| Silver Spring | ≈ 4 µg/m³ |
| Frederick | ≈ 3 µg/m³ |
| Waldorf | ≈ 4 µg/m³ |
| Glen Burnie | ≈ 3 µg/m³ |
| Gaithersburg | ≈ 3 µg/m³ |
| Ellicott City | ≈ 3 µg/m³ |
| Dundalk | ≈ 3 µg/m³ |
| Bethesda | ≈ 4 µg/m³ |
| Bowie | ≈ 4 µg/m³ |
| Towson | ≈ 3 µg/m³ |
| Aspen Hill | ≈ 3 µg/m³ |
| Wheaton | ≈ 3 µg/m³ |
| Bel Air South | ≈ 4 µg/m³ |
| Gwynn Oak | ≈ 3 µg/m³ |
| Potomac | ≈ 3 µg/m³ |
| Severn | ≈ 3 µg/m³ |
| North Bethesda | ≈ 3 µg/m³ |
| Catonsville | ≈ 3 µg/m³ |
| Annapolis | ≈ 3 µg/m³ |
| Hanover | ≈ 3 µg/m³ |
| Woodlawn | ≈ 3 µg/m³ |
| Severna Park | ≈ 3 µg/m³ |
| Odenton | ≈ 3 µg/m³ |
| Saint Charles | ≈ 4 µg/m³ |
| Clinton | ≈ 4 µg/m³ |
| Olney | ≈ 3 µg/m³ |
| Suitland-Silver Hill | ≈ 4 µg/m³ |
| Chillum | ≈ 4 µg/m³ |
| St. Charles | ≈ 4 µg/m³ |
| Salisbury | ≈ 4 µg/m³ |
| Randallstown | ≈ 4 µg/m³ |
| College Park | ≈ 4 µg/m³ |
| Montgomery Village | ≈ 3 µg/m³ |
| Pikesville | ≈ 3 µg/m³ |
| Parkville | ≈ 4 µg/m³ |
| Owings Mills | ≈ 3 µg/m³ |
| Bel Air North | ≈ 4 µg/m³ |
| Eldersburg | ≈ 3 µg/m³ |
Updated 2026-10-01 23:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.