SmogRank / World / United States / Ohio / 2026
Most polluted cities in Ohio, United States, 2026
28 cities in Ohio, United States ranked by their average PM2.5 so far (278 of 365 days); 28 above the WHO annual guideline (5.0 µg/m³). Worst: Maumee at 12.4 µg/m³, #697 of 2,745 cities in the world. Cleanest: Dent at 6.7. 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.
- 1Cleveland 2%
- 2Steubenville 1%
- 3Medina 1%
- 4Oregon 1%
- 5Maumee 1%
- 6Westerville 1%
- 7Warren 1%
- 8Toledo 1%
- 9Akron 1%
- 10Shaker Heights 1%
- 11Canton 1%
- 12Cleveland Heights 1%
- 13Dayton 1%
- 14Youngstown 1%
- 15Columbus 1%
- 16Warrensville Heights 1%
- 17Lima 1%
- 18Middletown 1%
- 19Springfield 1%
- 20Painesville 1%
- 21New Albany 0%
- 22Dublin 0%
- 23Wheelersburg 0%
- 24Norwood 0%
- 25Cincinnati 0%
- 26Sharonville 0%
- 27Lebanon 0%
- 28Dent 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, 2026 (so far), smogrank.com/us/region/ohio/history/2026 (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.