Milwaukee Air Quality in 2019
In 2019, Milwaukee's air quality (Milwaukee-Waukesha-West Allis, WI area) had a median daily AQI of 49 (Good) across 365 monitored days. 3 days (0.8%) reached Unhealthy for Sensitive Groups or worse, 193 were Good, and the year's peak AQI was 115 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 247 of those days. The cleanest month of 2019 was October (median AQI 38, 0 days above 100) and the worst was June (median 50, 1 day above 100, peak 108).
- Good: 52.9%
- Moderate: 46.3%
- Unhealthy for Sensitive Groups: 0.8%
- Unhealthy or worse: 0.0%
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How was Milwaukee's air quality in 2019?
Good on a typical day: median AQI 49, with 3 days above AQI 100 out of 365 monitored — the 1st cleanest of 7 years on record for the area.
- ✓Peak AQI in 2019: 115 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 247 days.
- ✓Cleanest month: October; worst: June.
Frequently asked questions
What was the average AQI in Milwaukee in 2019?▾
EPA's Air Quality System puts Milwaukee's (Milwaukee-Waukesha-West Allis, WI) median daily AQI for 2019 at 49, which is Good. 3 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 115.
Which month had the worst air quality in Milwaukee in 2019?▾
The cleanest month of 2019 was October (median AQI 38, 0 days above 100) and the worst was June (median 50, 1 day above 100, peak 108).
Was 2019 a good or bad year for Milwaukee's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 1st cleanest by days above AQI 100 — the best year on record here. 2019's median of 49 is in line with the area's typical annual median of 49.
Milwaukee month by month in 2019
Milwaukee air quality month by month, 2019 (Milwaukee-Waukesha-West Allis, WI, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 54 | 0 | 71 | PM2.5 |
| February | 28 | 54 | 0 | 91 | PM2.5 |
| March | 31 | 55 | 0 | 80 | PM2.5 |
| April | 30 | 48 | 0 | 79 | O3 |
| May | 31 | 43 | 0 | 77 | O3 |
| Juneworst | 30 | 50 | 1 | 108 | PM2.5 |
| July | 31 | 52 | 1 | 115 | O3 |
| August | 31 | 42 | 0 | 67 | PM2.5 |
| September | 30 | 40 | 1 | 105 | PM2.5 |
| Octobercleanest | 31 | 38 | 0 | 62 | PM2.5 |
| November | 30 | 53 | 0 | 74 | PM2.5 |
| December | 31 | 59 | 0 | 93 | PM2.5 |
How 2019 compares
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 1st cleanest by days above AQI 100 — the best year on record here.
2019's median of 49 is in line with the area's typical annual median of 49.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Milwaukee
The latest EPA AirNow observation puts Milwaukee's AQI at 22 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Milwaukee air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Milwaukee-Waukesha-West Allis, 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.