SmogRank / Countries / United States / Ohio
Most polluted cities in Ohio, United States
27 measured cities ranked by PM2.5, last 30 days. Worst: Lima at 10.4 µg/m³, #377 in the world.
| # | City | µg/m³ | |
|---|---|---|---|
| 1 | Lima Ohio | 10.4 | |
| 2 | Middletown Ohio | 10.3 | |
| 3 | Norwood Ohio | 8.9 | |
| 4 | Cincinnati Ohio | 8.4 | |
| 5 | Portsmouth Ohio | 8.4 | |
| 6 | Columbus Ohio | 7.7 | |
| 7 | Westerville Ohio | 7.5 | |
| 8 | Cleveland Ohio | 7.4 | |
| 9 | Perrysburg Ohio | 7.3 | |
| 10 | Dayton Ohio | 7.1 | |
| 11 | Toledo Ohio | 7.0 | |
| 12 | Warren Ohio | 7.0 | |
| 13 | Oregon Ohio | 6.9 | |
| 14 | Springfield Ohio | 6.8 | |
| 15 | Canton Ohio | 6.8 | |
| 16 | Steubenville Ohio | 6.1 | |
| 17 | Medina Ohio | 6.0 | |
| 18 | Youngstown Ohio | 5.9 | |
| 19 | Lebanon Ohio | 5.8 | |
| 20 | Mason Ohio | 5.8 | |
| 21 | Akron Ohio | 5.7 | |
| 22 | Cleveland Heights Ohio | 5.5 | |
| 23 | Dublin Ohio | 5.5 | |
| 24 | Shaker Heights Ohio | 5.5 | |
| 25 | Gahanna Ohio | 5.4 | |
| 26 | White Oak Ohio | 5.3 | |
| 27 | Painesville Ohio | 5.2 |
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
Ohio 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 |
|---|---|
| Parma estimated | ≈ 5 µg/m³ |
| Lorain estimated | ≈ 4 µg/m³ |
| Hamilton estimated | ≈ 6 µg/m³ |
| Kettering estimated | ≈ 5 µg/m³ |
| Elyria estimated | ≈ 6 µg/m³ |
| Lakewood estimated | ≈ 5 µg/m³ |
| Cuyahoga Falls estimated | ≈ 7 µg/m³ |
| Newark estimated | ≈ 5 µg/m³ |
| Euclid estimated | ≈ 5 µg/m³ |
| Mentor estimated | ≈ 5 µg/m³ |
| Mansfield estimated | ≈ 5 µg/m³ |
| Beavercreek estimated | ≈ 5 µg/m³ |
| Strongsville estimated | ≈ 6 µg/m³ |
| Fairfield estimated | ≈ 6 µg/m³ |
| Findlay estimated | ≈ 6 µg/m³ |
| Lancaster estimated | ≈ 6 µg/m³ |
| Grove City estimated | ≈ 7 µg/m³ |
| Huber Heights estimated | ≈ 5 µg/m³ |
| Delaware estimated | ≈ 6 µg/m³ |
| Reynoldsburg estimated | ≈ 7 µg/m³ |
| Marion estimated | ≈ 6 µg/m³ |
| Boardman estimated | ≈ 5 µg/m³ |
| Upper Arlington estimated | ≈ 7 µg/m³ |
| Stow estimated | ≈ 7 µg/m³ |
| Brunswick estimated | ≈ 6 µg/m³ |
| Collinwood estimated | ≈ 5 µg/m³ |
| Hilliard estimated | ≈ 7 µg/m³ |
| Fairborn estimated | ≈ 6 µg/m³ |
| North Ridgeville estimated | ≈ 6 µg/m³ |
| Westlake estimated | ≈ 4 µg/m³ |
| Massillon estimated | ≈ 7 µg/m³ |
| North Olmsted estimated | ≈ 4 µg/m³ |
| Bowling Green estimated | ≈ 5 µg/m³ |
| North Royalton estimated | ≈ 7 µg/m³ |
| Kent estimated | ≈ 7 µg/m³ |
| Austintown estimated | ≈ 6 µg/m³ |
| Garfield Heights estimated | ≈ 5 µg/m³ |
| Wooster estimated | ≈ 6 µg/m³ |
| Barberton estimated | ≈ 7 µg/m³ |
| Xenia estimated | ≈ 5 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.