Ann Arbor Air Quality in March
Across 2019–2025, Ann Arbor's March air quality had a median AQI of 43 (Good) over 217 monitored days in the Ann Arbor, MI area. 0.0% of March days (0 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 52.5% of days. The cleanest March on record here was 2024 (median AQI 38, 0 days above 100) and the worst was 2023 (median 52, 0 days above 100, peak AQI 68).
- Good: 70.0%
- Moderate: 30.0%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Improve Indoor Air Quality
Even with good outdoor air in Ann Arbor, indoor PM2.5, dust and allergens build up. A True-HEPA purifier keeps a bedroom or office consistently clean.
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How is the air in Ann Arbor in March?
Good on a typical day: median AQI 43 across 2019–2025, with 0.0% of March days above AQI 100. Ground-level ozone is the main driver.
- ✓70.0% of March days were Good (AQI 0–50), 30.0% Moderate (51–100).
- ✓0 days of 217 reached AQI 101+; the March peak was 84.
- ✓Best March: 2024; worst March: 2023.
Frequently asked questions
What is the air quality like in Ann Arbor in March?▾
Across 2019–2025, the median daily AQI in Ann Arbor in March was 43 (Good). 70.0% of days were Good, 30.0% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is March a good time for outdoor exercise in Ann Arbor?▾
A typical March day in Ann Arbor sits in the Good range (median AQI 43), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of March days reached AQI 101+ in 2019–2025.
Which pollutant causes Ann Arbor's March air quality problems?▾
Ground-level ozone set the daily AQI on 52.5% of March days in Ann Arbor. The highest March AQI recorded in 2019–2025 was 84 (Moderate), in 2023.
Ann Arbor March air quality, year by year
Ann Arbor March air quality by year (Ann Arbor, MI, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 44 | 0 | 70 | O3 |
| 2020 | 31 | 45 | 0 | 63 | PM2.5 |
| 2021 | 31 | 41 | 0 | 69 | O3 |
| 2022 | 31 | 41 | 0 | 84 | PM2.5 |
| 2023worst | 31 | 52 | 0 | 68 | PM2.5 |
| 2024cleanest | 31 | 38 | 0 | 63 | O3 |
| 2025 | 31 | 40 | 0 | 54 | O3 |
What March air means in Ann Arbor
A typical March day in Ann Arbor sits in the Good range (median AQI 43), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of March days reached AQI 101+ in 2019–2025.
March's median AQI of 43 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 March AQI across every EPA metro area (102,455 metro-days, 2019–2025) is 42, so Ann Arbor runs in line with the national March norm; 0.0% of its March days topped AQI 100 versus 0.4% nationally (about the same).
March is part of Ann Arbor's spring season (March, April, May); the spring 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.