Ann Arbor Air Quality in Spring
Across 2019–2025, Ann Arbor's spring (March–May) air quality had a median AQI of 44 (Good) over 644 monitored days in the Ann Arbor, MI area. 0.3% of spring days (2 of 644) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 66.9% of days. The cleanest spring on record here was 2022 (median AQI 41, 0 days above 100) and the worst was 2023 (median 52, 2 days above 100, peak AQI 129).
- Good: 72.0%
- Moderate: 27.6%
- Unhealthy for Sensitive Groups: 0.3%
- 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 spring?
Good on a typical day: median AQI 44 across 2019–2025, with 0.3% of spring days above AQI 100. Ground-level ozone is the main driver.
- ✓72.0% of spring days were Good (AQI 0–50), 27.6% Moderate (51–100).
- ✓2 days of 644 reached AQI 101+; the spring peak was 129.
- ✓Cleanest month: March; worst month: May.
Frequently asked questions
What is the air quality like in Ann Arbor in spring?▾
Across 2019–2025, the median daily AQI in Ann Arbor in spring was 44 (Good). 72.0% of days were Good, 27.6% Moderate, and 0.3% reached Unhealthy for Sensitive Groups or worse, based on 644 monitored days in EPA's Air Quality System.
Is spring a good time for outdoor exercise in Ann Arbor?▾
A typical spring day in Ann Arbor sits in the Good range (median AQI 44), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of spring days reached AQI 101+ in 2019–2025.
Which pollutant causes Ann Arbor's spring air quality problems?▾
Ground-level ozone set the daily AQI on 66.9% of spring days in Ann Arbor. The highest spring AQI recorded in 2019–2025 was 129 (Unhealthy for Sensitive Groups), in 2023.
Ann Arbor spring air quality, year by year
Ann Arbor spring air quality by year (Ann Arbor, MI, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 92 | 44 | 0 | 70 | O3 |
| 2020 | 92 | 43 | 0 | 64 | PM2.5 |
| 2021 | 92 | 44 | 0 | 93 | O3 |
| 2022cleanest | 92 | 41 | 0 | 97 | O3 |
| 2023worst | 92 | 52 | 2 | 129 | O3 |
| 2024 | 92 | 44 | 0 | 87 | O3 |
| 2025 | 92 | 41 | 0 | 100 | O3 |
What spring air means in Ann Arbor
A typical spring day in Ann Arbor sits in the Good range (median AQI 44), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of spring days reached AQI 101+ in 2019–2025.
Spring's median AQI of 44 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 Spring AQI across every EPA metro area (307,196 metro-days, 2019–2025) is 43, so Ann Arbor runs in line with the national Spring norm; 0.3% of its Spring days topped AQI 100 versus 0.8% nationally (about the same).
Within the season, March is the cleanest month (median AQI 43, 0.0% of days above 100) and May the worst (median 44, 0.9% above 100).
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 season 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.