SmogRank / World / United States / Ohio / January 2026
Most polluted cities in Ohio, United States, January 2026
28 cities in Ohio, United States ranked by their average PM2.5 over the 31 days. Worst: Wheelersburg at 12.2 µg/m³, #922 of 2,593 cities in the world. Cleanest: Lima at 6.4. 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.
- 1Wheelersburg 0%
- 2Middletown 0%
- 3Norwood 0%
- 4Westerville 0%
- 5Dayton 0%
- 5Steubenville 0%
- 5Toledo 0%
- 8Cincinnati 0%
- 9Columbus 0%
- 9Maumee 0%
- 11Dublin 0%
- 11Oregon 0%
- 13Cleveland 0%
- 14Medina 0%
- 15New Albany 0%
- 16Lebanon 0%
- 16Akron 0%
- 18Canton 0%
- 19Sharonville 0%
- 19Warrensville Heights 0%
- 21Dent 0%
- 21Warren 0%
- 23Springfield 0%
- 24Shaker Heights 0%
- 24Youngstown 0%
- 26Painesville 0%
- 27Cleveland Heights 0%
- 28Lima 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
All cities in the world, January 2026 · All cities in United States, January 2026 · Ohio now
Use this board
SmogRank, most polluted cities in Ohio, United States, PM2.5, January 2026, smogrank.com/us/region/ohio/history/2026-01 (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.