SmogRank / World / United States / Indiana / March 2025
Most polluted cities in Indiana, United States, March 2025
22 cities in Indiana, United States ranked by their average PM2.5 over the 31 days. Worst: Gary at 9.3 µg/m³, #1,704 of 2,809 cities in the world. Cleanest: Kokomo at 5.5. 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 4%
- 2Michigan City 3%
- 3Gary 0%
- 4Jeffersonville 0%
- 4Terre Haute 0%
- 6Evansville 0%
- 7Indianapolis 0%
- 8Bloomington 0%
- 9Columbus 0%
- 9New Albany 0%
- 11McCordsville 0%
- 11Lafayette 0%
- 13Elkhart 0%
- 13Hammond 0%
- 15East Chicago 0%
- 16Fort Wayne 0%
- 17Jasper 0%
- 17South Bend 0%
- 19Columbia City 0%
- 19Muncie 0%
- 21Anderson 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
All cities in the world, March 2025 · All cities in United States, March 2025 · Indiana now
Use this board
SmogRank, most polluted cities in Indiana, United States, PM2.5, March 2025, smogrank.com/us/region/indiana/history/2025-03 (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.