Madison Air Quality in 2024
In 2024, Madison's air quality (Madison, WI area) had a median daily AQI of 42 (Good) across 366 monitored days. 0 days (0.0%) reached Unhealthy for Sensitive Groups or worse, 262 were Good, and the year's peak AQI was 93 (Moderate). Fine particulate matter (PM2.5) set the daily AQI on 209 of those days. The cleanest month of 2024 was November (median AQI 32, 0 days above 100) and the worst was May (median 48, 0 days above 100, peak 77).
- Good: 71.6%
- Moderate: 28.4%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How was Madison's air quality in 2024?
Good on a typical day: median AQI 42, with 0 days above AQI 100 out of 366 monitored — the 1st cleanest of 7 years on record for the area.
- ✓Peak AQI in 2024: 93 (Moderate).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 209 days.
- ✓Cleanest month: November; worst: May.
Frequently asked questions
What was the average AQI in Madison in 2024?▾
EPA's Air Quality System puts Madison's (Madison, WI) median daily AQI for 2024 at 42, which is Good. 0 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 93.
Which month had the worst air quality in Madison in 2024?▾
The cleanest month of 2024 was November (median AQI 32, 0 days above 100) and the worst was May (median 48, 0 days above 100, peak 77).
Was 2024 a good or bad year for Madison's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 1st cleanest by days above AQI 100 — the best year on record here. 2024's median of 42 is below the area's typical annual median of 45.
Madison month by month in 2024
Madison air quality month by month, 2024 (Madison, WI, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 40 | 0 | 74 | PM2.5 |
| February | 29 | 38 | 0 | 64 | PM2.5 |
| March | 31 | 34 | 0 | 60 | PM2.5 |
| April | 30 | 45 | 0 | 61 | O3 |
| Mayworst | 31 | 48 | 0 | 77 | O3 |
| June | 30 | 44 | 0 | 67 | O3 |
| July | 31 | 44 | 0 | 64 | O3 |
| August | 31 | 44 | 0 | 67 | O3 |
| September | 30 | 39 | 0 | 93 | O3 |
| October | 31 | 37 | 0 | 64 | O3 |
| Novembercleanest | 30 | 32 | 0 | 62 | PM2.5 |
| December | 31 | 44 | 0 | 68 | PM2.5 |
How 2024 compares
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 1st cleanest by days above AQI 100 — the best year on record here.
2024's median of 42 is below the area's typical annual median of 45.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Madison
The latest EPA AirNow observation puts Madison's AQI at 49 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Madison air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Madison, WI), 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.