SmogRank / Countries / United States / Illinois

Most polluted cities in Illinois, United States

27 measured cities, this year; 27 above the WHO annual guideline. Worst: Franklin Park at 11.2 µg/m³, #484 in the world.

10 good  17 moderate

  1. 1Franklin Park 11.22.2×
  2. 2Brookfield 11.12.2×
  3. 3Dolton 11.02.2×
  4. 4Bridgeview 10.92.2×
  5. 5Elgin 10.82.2×
  6. 6Calumet City 10.22.0×
  7. 7Elmwood Park 10.22.0×
  8. 8Oak Lawn 10.22.0×
  9. 9Evanstonlow-cost sensors 10.12.0×
  10. 10Chicago 9.92.0×
  11. 11Granite City 9.71.9×
  12. 12Naperville 9.61.9×
  13. 13Rockford 9.51.9×
  14. 14Des Plaines 9.41.9×
  15. 15Northbrook 9.31.9×
  16. 16Peoria 9.31.9×
  17. 17Upper Alton 9.11.8×
  18. 18Aurora 8.91.8×
  19. 19Joliet 8.71.7×
  20. 20East Saint Louis 8.51.7×
  21. 21Cary 8.51.7×
  22. 22Zion 8.31.7×
  23. 23Decatur 8.21.6×
  24. 24Champaign 7.71.5×
  25. 25Moline 7.71.5×
  26. 26Springfield 7.61.5×
  27. 27Bloomington 7.11.4×
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

Estimated: cities without a monitor

Illinois 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
North Peoria≈ 6 µg/m³Good
Waukegan≈ 5 µg/m³Good
Cicero≈ 7 µg/m³Good
Arlington Heights≈ 9 µg/m³Good
Schaumburg≈ 8 µg/m³Good
Bolingbrook≈ 9 µg/m³Good
Palatine≈ 9 µg/m³Good
Orland Park≈ 9 µg/m³Good
Tinley Park≈ 8 µg/m³Good
Berwyn≈ 7 µg/m³Good
Mount Prospect≈ 9 µg/m³Good
Normal≈ 6 µg/m³Good
Oak Park≈ 7 µg/m³Good
Hoffman Estates≈ 8 µg/m³Good
Downers Grove≈ 9 µg/m³Moderate
Glenview≈ 7 µg/m³Good
Elmhurst≈ 9 µg/m³Moderate
Lombard≈ 9 µg/m³Moderate
DeKalb≈ 7 µg/m³Good
Plainfield≈ 8 µg/m³Good
Urbana≈ 6 µg/m³Good
Belleville≈ 6 µg/m³Good
Bartlett≈ 8 µg/m³Good
Buffalo Grove≈ 9 µg/m³Good
Quincy≈ 7 µg/m³Good
Streamwood≈ 8 µg/m³Good
Crystal Lake≈ 6 µg/m³Good
Carol Stream≈ 8 µg/m³Good
Romeoville≈ 9 µg/m³Good
Rock Island≈ 8 µg/m³Good
Carpentersville≈ 8 µg/m³Good
Hanover Park≈ 8 µg/m³Good
Wheeling≈ 9 µg/m³Good
Addison≈ 9 µg/m³Moderate
Glendale Heights≈ 8 µg/m³Good
Oswego≈ 8 µg/m³Good
Woodridge≈ 9 µg/m³Good
Elk Grove Village≈ 9 µg/m³Good
Pekin≈ 5 µg/m³Good
St. Charles≈ 8 µg/m³Good

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SmogRank, most polluted cities in Illinois, United States, PM2.5, this year to 2 Oct 2026, 00:00 UTC, smogrank.com/us/region/illinois?w=year.

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Updated 2026-10-02 00:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.