Madison Air Quality in 2019
In 2019, Madison's air quality (Madison, WI area) had a median daily AQI of 43 (Good) across 365 monitored days. 0 days (0.0%) reached Unhealthy for Sensitive Groups or worse, 238 were Good, and the year's peak AQI was 93 (Moderate). Fine particulate matter (PM2.5) set the daily AQI on 245 of those days. The cleanest month of 2019 was October (median AQI 35, 0 days above 100) and the worst was December (median 54, 0 days above 100, peak 87).
- Good: 65.2%
- Moderate: 34.8%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How was Madison's air quality in 2019?
Good on a typical day: median AQI 43, with 0 days above AQI 100 out of 365 monitored — the 2nd cleanest of 7 years on record for the area.
- ✓Peak AQI in 2019: 93 (Moderate).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 245 days.
- ✓Cleanest month: October; worst: December.
Frequently asked questions
What was the average AQI in Madison in 2019?▾
EPA's Air Quality System puts Madison's (Madison, WI) median daily AQI for 2019 at 43, 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 2019?▾
The cleanest month of 2019 was October (median AQI 35, 0 days above 100) and the worst was December (median 54, 0 days above 100, peak 87).
Was 2019 a good or bad year for Madison's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 2nd cleanest by days above AQI 100. 2019's median of 43 is in line with the area's typical annual median of 45.
Madison month by month in 2019
Madison air quality month by month, 2019 (Madison, WI, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 51 | 0 | 69 | PM2.5 |
| February | 28 | 52 | 0 | 88 | PM2.5 |
| March | 31 | 50 | 0 | 78 | PM2.5 |
| April | 30 | 45 | 0 | 73 | O3 |
| May | 31 | 42 | 0 | 61 | O3 |
| June | 30 | 43 | 0 | 84 | O3 |
| July | 31 | 45 | 0 | 93 | PM2.5 |
| August | 31 | 37 | 0 | 77 | O3 |
| September | 30 | 37 | 0 | 64 | PM2.5 |
| Octobercleanest | 31 | 35 | 0 | 59 | PM2.5 |
| November | 30 | 41 | 0 | 81 | PM2.5 |
| Decemberworst | 31 | 54 | 0 | 87 | PM2.5 |
How 2019 compares
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 2nd cleanest by days above AQI 100.
2019's median of 43 is in line with 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 24 (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.