SmogRank / Countries / United States / Ohio

Most polluted cities in Ohio, United States

27 measured cities, last 7 days; 0 above the WHO 24-hour guideline. Worst: Lima at 10.5 µg/m³, #461 in the world.

26 good  1 moderate

  1. 1Lima 10.5
  2. 2Middletown 9.0
  3. 3Columbus 8.2
  4. 4Toledo 8.2
  5. 5Norwood 7.6
  6. 6Cleveland 7.4
  7. 7Warren 7.3
  8. 8Oregon 6.8
  9. 9Cincinnati 6.7
  10. 10Perrysburg 6.4
  11. 11Westerville 6.3
  12. 12Youngstown 6.3
  13. 13Canton 6.2
  14. 14Dayton 6.0
  15. 15Portsmouth 6.0
  16. 16White Oak 5.8
  17. 17Steubenville 5.7
  18. 18Akron 5.6
  19. 19Lebanon 5.5
  20. 20Mason 5.5
  21. 21Dublin 5.5
  22. 22Springfield 5.4
  23. 23Medina 5.2
  24. 24Painesville 5.1
  25. 25Gahanna 4.7
  26. 26Cleveland Heights 4.6
  27. 27Shaker Heights 4.3
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

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.

City7-day estimateBand
Parma≈ 5 µg/m³Good
Lorain≈ 4 µg/m³Good
Hamilton≈ 6 µg/m³Good
Kettering≈ 5 µg/m³Good
Elyria≈ 6 µg/m³Good
Lakewood≈ 5 µg/m³Good
Cuyahoga Falls≈ 7 µg/m³Good
Newark≈ 5 µg/m³Good
Euclid≈ 5 µg/m³Good
Mentor≈ 5 µg/m³Good
Mansfield≈ 5 µg/m³Good
Beavercreek≈ 5 µg/m³Good
Strongsville≈ 6 µg/m³Good
Fairfield≈ 6 µg/m³Good
Findlay≈ 6 µg/m³Good
Lancaster≈ 6 µg/m³Good
Grove City≈ 7 µg/m³Good
Huber Heights≈ 5 µg/m³Good
Delaware≈ 6 µg/m³Good
Reynoldsburg≈ 7 µg/m³Good
Marion≈ 6 µg/m³Good
Boardman≈ 5 µg/m³Good
Upper Arlington≈ 7 µg/m³Good
Stow≈ 7 µg/m³Good
Brunswick≈ 6 µg/m³Good
Collinwood≈ 5 µg/m³Good
Hilliard≈ 7 µg/m³Good
Fairborn≈ 6 µg/m³Good
North Ridgeville≈ 6 µg/m³Good
Westlake≈ 4 µg/m³Good
Massillon≈ 7 µg/m³Good
North Olmsted≈ 4 µg/m³Good
Bowling Green≈ 5 µg/m³Good
North Royalton≈ 7 µg/m³Good
Kent≈ 7 µg/m³Good
Austintown≈ 6 µg/m³Good
Garfield Heights≈ 5 µg/m³Good
Wooster≈ 6 µg/m³Good
Barberton≈ 7 µg/m³Good
Xenia≈ 5 µg/m³Good

Updated 2026-10-01 17:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.