SmogRank / World / North America / United States / Indiana

Most polluted cities in Indiana, United States

18 measured cities, this year; 18 above the WHO annual guideline. Worst: Columbia City at 10.1 µg/m³, #964 in the world.

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.

Michigan: 21 measured citiesOhio: 27 measured citiesIllinois: 31 measured citiesKentucky: 17 measured citiesIndiana: 18 measured cities#18 Lafayette: 7.4 µg/m³#17 Anderson: 7.8 µg/m³#16 New Albany: 8.0 µg/m³#15 Jasper: 8.1 µg/m³#14 Bloomington: 8.2 µg/m³#13 Muncie: 8.3 µg/m³#12 Gary: 8.6 µg/m³#11 Michigan City: 8.7 µg/m³#8 Evansville: 8.8 µg/m³#9 Jeffersonville: 8.8 µg/m³#10 South Bend: 8.8 µg/m³#7 East Chicago: 8.9 µg/m³#6 Elkhart: 9.1 µg/m³#4 Indianapolis: 9.4 µg/m³#5 Portage: 9.4 µg/m³#3 Hammond: 9.5 µg/m³#2 Fort Wayne: 9.9 µg/m³#1 Columbia City: 10.1 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Gary 2% 1.5%0
Every measured city in Indiana, United States, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Gary 2%
  2. 2Portage 2%
  3. 3Elkhart 1%
  4. 4East Chicago 1%
  5. 5Columbia City 1%
  6. 6Hammond 1%
  7. 7Fort Wayne 1%
  8. 8South Bend 1%
  9. 9Michigan City 1%
  10. 10Muncie 1%
  11. 11Anderson 1%
  12. 12Indianapolis 1%
  13. 13Bloomington 1%
  14. 14Lafayette 0%
  15. 15Evansville 0%
  16. 15Jeffersonville 0%
  17. 17Jasperlast full day 3 Oct 0%
  18. 18New Albany 0%
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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

Estimated: cities without a monitor

Indiana cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Carmel≈ 8 µg/m³Good
Fishers≈ 8 µg/m³Good
Noblesville≈ 8 µg/m³Good
Greenwood≈ 7 µg/m³Good
Mishawaka≈ 6 µg/m³Good
Lawrence≈ 8 µg/m³Good
West Lafayette≈ 6 µg/m³Good
Westfield≈ 8 µg/m³Good
Richmond≈ 7 µg/m³Good
Merrillville≈ 6 µg/m³Good
Goshen≈ 7 µg/m³Good
Valparaiso≈ 6 µg/m³Good
Plainfield≈ 7 µg/m³Good
Granger≈ 6 µg/m³Good
Marion≈ 7 µg/m³Good
Crown Point≈ 6 µg/m³Good
Schererville≈ 7 µg/m³Good
Hobart≈ 6 µg/m³Good
Zionsville≈ 8 µg/m³Good
Brownsburg≈ 8 µg/m³Good
Franklin≈ 7 µg/m³Good
Munster≈ 7 µg/m³Good
Highland≈ 7 µg/m³Good
La Porte≈ 6 µg/m³Good
Clarksville≈ 7 µg/m³Good
Greenfield≈ 6 µg/m³Good
Fairfield Heights≈ 8 µg/m³Good
Seymour≈ 6 µg/m³Good
Shelbyville≈ 6 µg/m³Good
Vincennes≈ 6 µg/m³Good
Logansport≈ 6 µg/m³Good
New Castle≈ 6 µg/m³Good
Huntington≈ 7 µg/m³Good
Broad Ripple≈ 8 µg/m³Good
Avon≈ 7 µg/m³Good
Griffith≈ 7 µg/m³Good
Frankfort≈ 7 µg/m³Good
Dyer≈ 7 µg/m³Good
Crawfordsville≈ 7 µg/m³Good
Lebanon≈ 8 µg/m³Good

Bad-air episodes in Indiana

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

Use this board

SmogRank, most polluted cities in Indiana, United States, PM2.5, this year to 6 Oct 2026, 22:00 UTC, smogrank.com/us/region/indiana?w=year.

Download top 10 (PNG)

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.

Updated 2026-10-06 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.