Ann Arbor Air Quality in November
Across 2019–2025, Ann Arbor's November air quality had a median AQI of 41 (Good) over 210 monitored days in the Ann Arbor, MI area. 0.0% of November days (0 of 210) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 72.4% of days. The cleanest November on record here was 2024 (median AQI 33, 0 days above 100) and the worst was 2022 (median 53, 0 days above 100, peak AQI 90).
- Good: 62.4%
- Moderate: 37.6%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Ann Arbor in November?
Good on a typical day: median AQI 41 across 2019–2025, with 0.0% of November days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓62.4% of November days were Good (AQI 0–50), 37.6% Moderate (51–100).
- ✓0 days of 210 reached AQI 101+; the November peak was 98.
- ✓Best November: 2024; worst November: 2022.
Frequently asked questions
What is the air quality like in Ann Arbor in November?▾
Across 2019–2025, the median daily AQI in Ann Arbor in November was 41 (Good). 62.4% of days were Good, 37.6% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is November a good time for outdoor exercise in Ann Arbor?▾
A typical November day in Ann Arbor sits in the Good range (median AQI 41), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of November days reached AQI 101+ in 2019–2025.
Which pollutant causes Ann Arbor's November air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 72.4% of November days in Ann Arbor. The highest November AQI recorded in 2019–2025 was 98 (Moderate), in 2022.
Ann Arbor November air quality, year by year
Ann Arbor November air quality by year (Ann Arbor, MI, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 49 | 0 | 78 | PM2.5 |
| 2020 | 30 | 45 | 0 | 98 | PM2.5 |
| 2021 | 30 | 43 | 0 | 67 | PM2.5 |
| 2022worst | 30 | 53 | 0 | 90 | PM2.5 |
| 2023 | 30 | 41 | 0 | 77 | PM2.5 |
| 2024cleanest | 30 | 33 | 0 | 61 | PM2.5 |
| 2025 | 30 | 33 | 0 | 68 | PM2.5 |
What November air means in Ann Arbor
A typical November day in Ann Arbor sits in the Good range (median AQI 41), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of November days reached AQI 101+ in 2019–2025.
November's median AQI of 41 is in line with Ann Arbor's whole-year median of 44, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median November AQI across every EPA metro area (92,704 metro-days, 2019–2025) is 39, so Ann Arbor runs in line with the national November norm; 0.0% of its November days topped AQI 100 versus 0.6% nationally (about the same).
November is part of Ann Arbor's fall season (September, October, November); the fall page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Ann Arbor
The latest EPA AirNow observation puts Ann Arbor's AQI at 29 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Ann Arbor air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Ann Arbor, MI), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.