Flint Air Quality in 2021
In 2021, Flint's air quality (Flint, MI area) had a median daily AQI of 41 (Good) across 365 monitored days. 3 days (0.8%) reached Unhealthy for Sensitive Groups or worse, 247 were Good, and the year's peak AQI was 119 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 200 of those days. The cleanest month of 2021 was October (median AQI 31, 0 days above 100) and the worst was June (median 46, 2 days above 100, peak 105).
- Good: 67.7%
- Moderate: 31.5%
- Unhealthy for Sensitive Groups: 0.8%
- Unhealthy or worse: 0.0%
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How was Flint's air quality in 2021?
Good on a typical day: median AQI 41, with 3 days above AQI 100 out of 365 monitored — the 6th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2021: 119 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 200 days.
- ✓Cleanest month: October; worst: June.
Frequently asked questions
What was the average AQI in Flint in 2021?▾
EPA's Air Quality System puts Flint's (Flint, MI) median daily AQI for 2021 at 41, which is Good. 3 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 119.
Which month had the worst air quality in Flint in 2021?▾
The cleanest month of 2021 was October (median AQI 31, 0 days above 100) and the worst was June (median 46, 2 days above 100, peak 105).
Was 2021 a good or bad year for Flint's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2021 ranks 6th cleanest by days above AQI 100. 2021's median of 41 is in line with the area's typical annual median of 42.
Flint month by month in 2021
Flint air quality month by month, 2021 (Flint, MI, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 46 | 0 | 65 | PM2.5 |
| February | 28 | 47 | 0 | 72 | PM2.5 |
| March | 31 | 42 | 0 | 60 | O3 |
| April | 30 | 42 | 0 | 61 | O3 |
| May | 31 | 44 | 1 | 119 | O3 |
| Juneworst | 30 | 46 | 2 | 105 | O3 |
| July | 31 | 50 | 0 | 88 | PM2.5 |
| August | 31 | 47 | 0 | 70 | PM2.5 |
| September | 30 | 35 | 0 | 48 | O3 |
| Octobercleanest | 31 | 31 | 0 | 58 | PM2.5 |
| November | 30 | 37 | 0 | 60 | PM2.5 |
| December | 31 | 36 | 0 | 66 | PM2.5 |
How 2021 compares
Among the 7 years EPA has published for the area (2019–2025), 2021 ranks 6th cleanest by days above AQI 100.
2021's median of 41 is in line with the area's typical annual median of 42.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Flint
The latest EPA AirNow observation puts Flint's AQI at 31 (PM2.5). The figures above are multi-year annual 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.