SmogRank / World / United States / Michigan / October 2025

Most polluted cities in Michigan, United States, October 2025

20 cities in Michigan, United States ranked by their average PM2.5 over the 31 days. Worst: Wyoming at 9.2 µg/m³, #621 of 2,564 cities in the world. Cleanest: Marquette at 3.3. A city needs measurements on 70% of the days to be ranked.

← Wyoming 9.2 µg/m³ 20 µg/m³0

Every city in Michigan, United States ranked for October 2025, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.

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

All cities in the world, October 2025 · All cities in United States, October 2025 · Michigan now

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SmogRank, most polluted cities in Michigan, United States, PM2.5, October 2025, smogrank.com/us/region/michigan/history/2025-10 (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.