SmogRank / World / United States / Indiana / 2025
Most polluted cities in Indiana, United States, 2025
22 cities in Indiana, United States ranked by their average PM2.5 over the 365 days; 22 above the WHO annual guideline (5.0 µg/m³). Worst: Gary at 10.7 µg/m³, #765 of 2,624 cities in the world. Cleanest: Kokomo at 6.8. 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.
- 1Portage 1%
- 2Hammond 1%
- 3Michigan City 1%
- 4Gary 1%
- 5Elkhart 1%
- 6East Chicago 1%
- 7South Bend 1%
- 8New Albany 0%
- 9McCordsville 0%
- 10Fort Wayne 0%
- 11Columbia City 0%
- 12Indianapolis 0%
- 13Terre Haute 0%
- 14Jeffersonville 0%
- 15Evansville 0%
- 15Lafayette 0%
- 17Muncie 0%
- 18Jasper 0%
- 19Anderson 0%
- 20Bloomington 0%
- 21Columbus 0%
- 22Kokomo 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, 2025, smogrank.com/us/region/indiana/history/2025 (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.