Flint Air Quality in Winter
Across 2019–2025, Flint's winter (December–February) air quality had a median AQI of 41 (Good) over 565 monitored days in the Flint, MI area. 0.0% of winter days (0 of 565) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 97.5% of days. The cleanest winter on record here was 2025 (median AQI 32, 0 days above 100) and the worst was 2022 (median 46, 0 days above 100, peak AQI 81).
- Good: 64.2%
- Moderate: 35.8%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Flint in winter?
Good on a typical day: median AQI 41 across 2019–2025, with 0.0% of winter days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓64.2% of winter days were Good (AQI 0–50), 35.8% Moderate (51–100).
- ✓0 days of 565 reached AQI 101+; the winter peak was 81.
- ✓Cleanest month: January; worst month: December.
Frequently asked questions
What is the air quality like in Flint in winter?▾
Across 2019–2025, the median daily AQI in Flint in winter was 41 (Good). 64.2% of days were Good, 35.8% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 565 monitored days in EPA's Air Quality System.
Is winter a good time for outdoor exercise in Flint?▾
A typical winter day in Flint 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 winter days reached AQI 101+ in 2019–2025.
Which pollutant causes Flint's winter air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 97.5% of winter days in Flint. The highest winter AQI recorded in 2019–2025 was 81 (Moderate), in 2022.
Flint winter air quality, year by year
Flint winter air quality by year (Flint, MI, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 65 | 46 | 0 | 72 | PM2.5 |
| 2020 | 91 | 36 | 0 | 75 | PM2.5 |
| 2021 | 90 | 44 | 0 | 72 | PM2.5 |
| 2022worst | 89 | 46 | 0 | 81 | PM2.5 |
| 2023 | 89 | 45 | 0 | 79 | PM2.5 |
| 2024 | 82 | 38 | 0 | 70 | PM2.5 |
| 2025cleanest | 59 | 32 | 0 | 65 | PM2.5 |
What winter air means in Flint
A typical winter day in Flint 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 winter days reached AQI 101+ in 2019–2025.
Winter's median AQI of 41 is in line with Flint's whole-year median of 42, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median Winter AQI across every EPA metro area (278,620 metro-days, 2019–2025) is 40, so Flint runs in line with the national Winter norm; 0.0% of its Winter days topped AQI 100 versus 0.6% nationally (about the same).
Within the season, January is the cleanest month (median AQI 39, 0.0% of days above 100) and December the worst (median 42, 0.0% above 100).
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Flint
The latest EPA AirNow observation puts Flint's AQI at 20 (PM2.5). The figures above are multi-year season statistics, not today's reading.
View current Flint air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Flint, 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.