SmogRank / World / United States / Michigan / September 2025

Most polluted cities in Michigan, United States, September 2025

21 cities in Michigan, United States ranked by their average PM2.5 over the 30 days. Worst: Wyoming at 11.5 µg/m³, #480 of 3,052 cities in the world. Cleanest: Marquette at 5.0. 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.

← Wyoming 0% 0.75%0
Every city in Michigan, United States ranked for September 2025, 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. 1Wyoming
    0%
  2. 2Kalamazoo
    0%
  3. 3Ann Arborlow-cost sensors
    0%
  4. 3Dearborn
    0%
  5. 5Detroit
    0%
  6. 6Lincoln Park
    0%
  7. 7Grand Rapids
    0%
  8. 7Holland
    0%
  9. 9Redford
    0%
  10. 10Taylor
    0%
  11. 11Southfield
    0%
  12. 12Lansing
    0%
  13. 13Hudsonville
    0%
  14. 14Ypsilanti
    0%
  15. 15New Baltimore
    0%
  16. 15Tecumseh
    0%
  17. 17Eastpointe
    0%
  18. 18Bay City
    0%
  19. 18Port Huron
    0%
  20. 20Manistee
    0%
  21. 21Marquette
    0%

Low-cost sensors: consumer units, counted only in cities with no government-grade monitor; they read close to reference monitors on the whole, but 15 to 25% high in humid air. How we use them.

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

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SmogRank, most polluted cities in Michigan, United States, PM2.5, September 2025, smogrank.com/us/region/michigan/history/2025-09 (accessed 7 Oct 2026).

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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.