SmogRank / World / United States / Indiana / October 2025
Most polluted cities in Indiana, United States, October 2025
22 cities in Indiana, United States ranked by their average PM2.5 over the 31 days. Worst: Gary at 8.2 µg/m³, #779 of 2,564 cities in the world. Cleanest: Columbus at 4.3. 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.
- 1Gary 0%
- 2Terre Haute 0%
- 3Indianapolis 0%
- 4Jeffersonville 0%
- 5New Albany 0%
- 5Lafayette 0%
- 7Evansville 0%
- 7Elkhart 0%
- 9Hammond 0%
- 10Fort Wayne 0%
- 11Muncie 0%
- 12Columbia City 0%
- 13East Chicago 0%
- 14McCordsville 0%
- 14Portage 0%
- 14South Bend 0%
- 17Anderson 0%
- 18Jasper 0%
- 18Michigan City 0%
- 20Bloomington 0%
- 21Kokomo 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, October 2025, smogrank.com/us/region/indiana/history/2025-10 (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.