SmogRank / Countries / United States / Ohio
Most polluted cities in Ohio, United States
19 measured cities, last 24 hours; 0 above the WHO 24-hour guideline. Worst: Lima at 14.4 µg/m³, #61 in the world.
8 good 11 moderate
- 1Lima 14.41.0×
- 2Toledo 14.20.9×
- 3Oregon 13.20.9×
- 4Dayton 13.10.9×
- 5Portsmouth 12.70.8×
- 6Cleveland 12.50.8×
- 7Columbus 11.30.8×
- 8Lebanon 10.50.7×
- 9White Oak 10.50.7×
- 10Perrysburg 9.90.7×
- 11Springfield 9.70.6×
- 12Mason 8.80.6×
- 13Medina 8.80.6×
- 14Canton 8.30.6×
- 15Steubenville 8.20.5×
- 16Cleveland Heights 8.00.5×
- 17Akron 7.70.5×
- 18Painesville 7.60.5×
- 19Shaker Heights 7.60.5×
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
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 | ≈ 5 µg/m³ |
| Lorain | ≈ 4 µg/m³ |
| Hamilton | ≈ 6 µg/m³ |
| Kettering | ≈ 5 µg/m³ |
| Elyria | ≈ 6 µg/m³ |
| Lakewood | ≈ 5 µg/m³ |
| Cuyahoga Falls | ≈ 7 µg/m³ |
| Newark | ≈ 5 µg/m³ |
| Euclid | ≈ 5 µg/m³ |
| Mentor | ≈ 5 µg/m³ |
| Mansfield | ≈ 5 µg/m³ |
| Beavercreek | ≈ 5 µg/m³ |
| Strongsville | ≈ 6 µg/m³ |
| Fairfield | ≈ 6 µg/m³ |
| Findlay | ≈ 6 µg/m³ |
| Lancaster | ≈ 6 µg/m³ |
| Grove City | ≈ 7 µg/m³ |
| Huber Heights | ≈ 5 µg/m³ |
| Delaware | ≈ 6 µg/m³ |
| Reynoldsburg | ≈ 7 µg/m³ |
| Marion | ≈ 6 µg/m³ |
| Boardman | ≈ 5 µg/m³ |
| Upper Arlington | ≈ 7 µg/m³ |
| Stow | ≈ 7 µg/m³ |
| Brunswick | ≈ 6 µg/m³ |
| Collinwood | ≈ 5 µg/m³ |
| Hilliard | ≈ 7 µg/m³ |
| Fairborn | ≈ 6 µg/m³ |
| North Ridgeville | ≈ 6 µg/m³ |
| Westlake | ≈ 4 µg/m³ |
| Massillon | ≈ 7 µg/m³ |
| North Olmsted | ≈ 4 µg/m³ |
| Bowling Green | ≈ 5 µg/m³ |
| North Royalton | ≈ 7 µg/m³ |
| Kent | ≈ 7 µg/m³ |
| Austintown | ≈ 6 µg/m³ |
| Garfield Heights | ≈ 5 µg/m³ |
| Wooster | ≈ 6 µg/m³ |
| Barberton | ≈ 7 µg/m³ |
| Xenia | ≈ 5 µg/m³ |
Updated 2026-10-01 18:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.