Marquette, Michigan Air Quality
Marquette air quality today — the AQI, the main pollutant, and whether it’s safe to exercise outside right now
Marquette, MI · Air quality right now
The air quality index in Marquette, MI is 29 (Good) right now — safe for outdoor activity.
Is it safe to be outside in Marquette today?
AQI 29 Yes — air quality is Good
Air is clean — great for outdoor activity.Main pollutant: OzoneObserved 1:00 AM EDT
Pollutants right now
- PM2.52.0 µg/m³fine particles — smoke, exhaust, soot
- PM102.1 µg/m³coarse particles — dust, pollen, ash
- Ozone60 µg/m³Main pollutantsmog — builds on hot, sunny days
- NO₂0.5 µg/m³nitrogen dioxide — traffic, combustion
ExerciseOK to run — no air-quality limits on outdoor exercise.
How to read Marquette’s air quality
Guides: The AQI Scale, Explained · Air Quality Alerts, Decoded · How to Read a Wildfire Smoke Map · Why Wildfire Smoke Travels 1,000 Miles.
Air quality over time in Marquette
Across the EPA’s county records from 2024 to 2025, Marquette’s cleanest year was 2024 (median AQI 19) and its most polluted was 2024 (median AQI 19); the typical (median) day has held roughly steady since 2024.
| Year | Median AQI | Unhealthy+ | Main pollutant | USG | Moderate | Good |
|---|---|---|---|---|---|---|
| 2024 | 19 | 0 | PM2.5 | 0 | 22 | 202 |
| 2025 | 19 | 6 | PM2.5 | 7 | 41 | 253 |
“USG” is Unhealthy for Sensitive Groups (AQI 101–150); “Unhealthy+” combines the Unhealthy, Very Unhealthy, and Hazardous days. In 2024 the EPA tightened the annual fine-particle (PM2.5) standard to 9 µg/m³ from the previous 12 µg/m³, so counties near the old limit read worse against the new one. Source: EPA AQS annual summaries, 2024–2025.
Frequently asked
- What was the worst year for air quality in Marquette?
- In the EPA's 2024–2025 county records, 2025 had the most days above AQI 100: 13 days (7 Unhealthy for Sensitive Groups, 6 Unhealthy or worse). It also had the highest median AQI, 19.
- How many unhealthy air days does Marquette have?
- Across 2024–2025, 2% of the days reported for Marquette's county had an AQI above 100 (13 of 531), about 7 days a year. 2025 had 13 days.
- What's the main air pollutant in Marquette?
- PM2.5: it drove Marquette's county AQI on the most days in every year of the EPA's 2024–2025 records.