SmogRank / World / United States / Indiana / September 2025
Most polluted cities in Indiana, United States, September 2025
22 cities in Indiana, United States ranked by their average PM2.5 over the 30 days. Worst: Indianapolis at 12.2 µg/m³, #428 of 3,052 cities in the world. Cleanest: Columbus at 5.4. 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.
- 1Indianapolis 0%
- 2Gary 0%
- 3Jeffersonville 0%
- 4Lafayette 0%
- 5Terre Haute 0%
- 6Evansville 0%
- 7Fort Wayne 0%
- 8Elkhart 0%
- 8Michigan City 0%
- 10Hammond 0%
- 11New Albany 0%
- 12South Bend 0%
- 13Portage 0%
- 14Columbia City 0%
- 15East Chicago 0%
- 16Muncie 0%
- 17Jasper 0%
- 18Anderson 0%
- 19Kokomo 0%
- 20Bloomington 0%
- 21McCordsville 0%
- 22Columbus 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 Indiana, United States, PM2.5, September 2025, smogrank.com/us/region/indiana/history/2025-09 (accessed 7 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.