SmogRank / World / United States / Ohio / October 2025
Most polluted cities in Ohio, United States, October 2025
28 cities in Ohio, United States ranked by their average PM2.5 over the 31 days. Worst: Middletown at 8.0 µg/m³, #835 of 2,564 cities in the world. Cleanest: Painesville at 3.9. 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.
- 1Middletown 0%
- 2Columbus 0%
- 3Wheelersburg 0%
- 4Norwood 0%
- 5Cincinnati 0%
- 5Westerville 0%
- 7Dayton 0%
- 7Canton 0%
- 9Cleveland 0%
- 9Lima 0%
- 9Steubenville 0%
- 12Oregon 0%
- 12Warren 0%
- 14Maumee 0%
- 15Springfield 0%
- 16Dent 0%
- 17Dublin 0%
- 18Lebanon 0%
- 19Akron 0%
- 19Youngstown 0%
- 21Toledo 0%
- 22Sharonville 0%
- 23Medina 0%
- 23Shaker Heights 0%
- 25Warrensville Heights 0%
- 26Cleveland Heights 0%
- 26New Albany 0%
- 26Painesville 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, October 2025, smogrank.com/us/region/ohio/history/2025-10 (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.