SmogRank / World / United States / Ohio / October 2026
Most polluted cities in Ohio, United States, October 2026
25 cities in Ohio, United States ranked by their average PM2.5 so far (5 of 31 days). Worst: Middletown at 11.3 µg/m³, #369 of 2,246 cities in the world. Cleanest: Warrensville Heights at 5.1. 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%
- 2Lima 0%
- 3Columbus 0%
- 4Toledo 0%
- 5Wheelersburg 0%
- 6Cincinnati 0%
- 6Westerville 0%
- 8Dayton 0%
- 9Dent 0%
- 9Warren 0%
- 11Oregon 0%
- 12Springfield 0%
- 12Canton 0%
- 12Steubenville 0%
- 12Youngstown 0%
- 16Maumee 0%
- 17Dublin 0%
- 18Cleveland 0%
- 19Lebanon 0%
- 20Akron 0%
- 20Medina 0%
- 22Sharonville 0%
- 23Cleveland Heights 0%
- 23Painesville 0%
- 23Warrensville Heights 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 2026 (so far), smogrank.com/us/region/ohio/history/2026-10 (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.