Ann Arbor Air Quality in February
Across 2019–2025, Ann Arbor's February air quality had a median AQI of 47 (Good) over 198 monitored days in the Ann Arbor, MI area. 0.0% of February days (0 of 198) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 69.7% of days. The cleanest February on record here was 2025 (median AQI 40, 0 days above 100) and the worst was 2023 (median 52, 0 days above 100, peak AQI 68).
- Good: 55.6%
- Moderate: 44.4%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Ann Arbor in February?
Good on a typical day: median AQI 47 across 2019–2025, with 0.0% of February days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓55.6% of February days were Good (AQI 0–50), 44.4% Moderate (51–100).
- ✓0 days of 198 reached AQI 101+; the February peak was 89.
- ✓Best February: 2025; worst February: 2023.
Frequently asked questions
What is the air quality like in Ann Arbor in February?▾
Across 2019–2025, the median daily AQI in Ann Arbor in February was 47 (Good). 55.6% of days were Good, 44.4% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 198 monitored days in EPA's Air Quality System.
Is February a good time for outdoor exercise in Ann Arbor?▾
A typical February day in Ann Arbor sits in the Good range (median AQI 47), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of February days reached AQI 101+ in 2019–2025.
Which pollutant causes Ann Arbor's February air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 69.7% of February days in Ann Arbor. The highest February AQI recorded in 2019–2025 was 89 (Moderate), in 2023.
Ann Arbor February air quality, year by year
Ann Arbor February air quality by year (Ann Arbor, MI, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 28 | 47 | 0 | 89 | PM2.5 |
| 2020 | 29 | 42 | 0 | 68 | PM2.5 |
| 2021 | 28 | 52 | 0 | 82 | PM2.5 |
| 2022 | 28 | 47 | 0 | 78 | PM2.5 |
| 2023worst | 28 | 52 | 0 | 68 | PM2.5 |
| 2024 | 29 | 46 | 0 | 81 | PM2.5 |
| 2025cleanest | 28 | 40 | 0 | 68 | O3 |
What February air means in Ann Arbor
A typical February day in Ann Arbor sits in the Good range (median AQI 47), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of February days reached AQI 101+ in 2019–2025.
February's median AQI of 47 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 February AQI across every EPA metro area (87,428 metro-days, 2019–2025) is 41, so Ann Arbor runs above the national February norm; 0.0% of its February days topped AQI 100 versus 0.4% nationally (about the same).
February is part of Ann Arbor's winter season (December, January, February); the winter 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.