SmogRank / World / United States / Ohio / May 2025
Most polluted cities in Ohio, United States, May 2025
27 cities in Ohio, United States ranked by their average PM2.5 over the 31 days. Worst: Middletown at 7.5 µg/m³, #1,441 of 2,771 cities in the world. Cleanest: Painesville at 4.1. 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%
- 2Columbus 0%
- 3Oregon 0%
- 4Maumee 0%
- 4Westerville 0%
- 6Springfield 0%
- 6Canton 0%
- 8Norwood 0%
- 9Dayton 0%
- 9Dublin 0%
- 11Steubenville 0%
- 12Cleveland 0%
- 13Cincinnati 0%
- 14Wheelersburg 0%
- 15Lebanon 0%
- 15Akron 0%
- 15Toledo 0%
- 18Dent 0%
- 18Lima 0%
- 18Warren 0%
- 21Youngstown 0%
- 22New Albany 0%
- 23Sharonville 0%
- 23Medina 0%
- 23Warrensville Heights 0%
- 26Cleveland Heights 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, May 2025, smogrank.com/us/region/ohio/history/2025-05 (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.