SmogRank / World / United States / Ohio / September 2025
Most polluted cities in Ohio, United States, September 2025
27 cities in Ohio, United States ranked by their average PM2.5 over the 30 days. Worst: Middletown at 12.8 µg/m³, #394 of 3,052 cities in the world. Cleanest: Painesville at 6.2. 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%
- 2Norwood 0%
- 3Cincinnati 0%
- 3Columbus 0%
- 5Wheelersburg 0%
- 6Oregon 0%
- 7Maumee 0%
- 8Cleveland 0%
- 9Steubenville 0%
- 9Westerville 0%
- 11Dayton 0%
- 11Canton 0%
- 13Warren 0%
- 14Springfield 0%
- 15Toledo 0%
- 16Akron 0%
- 17Lima 0%
- 17Youngstown 0%
- 19Dublin 0%
- 20New Albany 0%
- 21Lebanon 0%
- 21Sharonville 0%
- 23Dent 0%
- 24Cleveland Heights 0%
- 25Warrensville Heights 0%
- 26Medina 0%
- 27Painesville 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, September 2025, smogrank.com/us/region/ohio/history/2025-09 (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.