SmogRank / World / United States / Ohio / 2025
Most polluted cities in Ohio, United States, 2025
27 cities in Ohio, United States ranked by their average PM2.5 over the 365 days; 27 above the WHO annual guideline (5.0 µg/m³). Worst: Middletown at 10.4 µg/m³, #836 of 2,624 cities in the world. Cleanest: Sharonville at 6.3. A city needs measurements on 70% of the days to be ranked.
Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.
- 1Toledo 1%
- 2Maumee 1%
- 3Warren 1%
- 4Oregon 1%
- 5Middletown 1%
- 6Norwood 0%
- 7Dent 0%
- 8Youngstown 0%
- 9Akron 0%
- 10Dayton 0%
- 11Painesville 0%
- 12Wheelersburg 0%
- 13Cincinnati 0%
- 14Canton 0%
- 15Columbus 0%
- 15Steubenville 0%
- 17Westerville 0%
- 18Cleveland 0%
- 19Springfield 0%
- 20Dublin 0%
- 21Lima 0%
- 21Warrensville Heights 0%
- 23Lebanon 0%
- 24Cleveland Heights 0%
- 24Medina 0%
- 24New Albany 0%
- 27Sharonville 0%
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
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SmogRank, most polluted cities in Ohio, United States, PM2.5, 2025, smogrank.com/us/region/ohio/history/2025 (accessed 6 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.