Milwaukee Air Quality in June
Across 2019–2025, Milwaukee's June air quality had a median AQI of 53 (Moderate) over 210 monitored days in the Milwaukee-Waukesha-West Allis, WI area. 16.2% of June days (34 of 210) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 65.7% of days. The cleanest June on record here was 2019 (median AQI 50, 1 day above 100) and the worst was 2023 (median 97, 14 days above 100, peak AQI 270).
- Good: 39.0%
- Moderate: 44.8%
- Unhealthy for Sensitive Groups: 13.8%
- Unhealthy or worse: 2.4%
Reduce Indoor Ozone in Milwaukee
Today's main pollutant in Milwaukee is ground-level ozone (AQI 32). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Recommended: Levoit Core 300 — True HEPA + activated carbon · CADR ~141 CFM · rooms up to 219 sq ft
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How is the air in Milwaukee in June?
Moderate on a typical day: median AQI 53 across 2019–2025, with 16.2% of June days above AQI 100. Ground-level ozone is the main driver.
- ✓39.0% of June days were Good (AQI 0–50), 44.8% Moderate (51–100).
- ✓34 days of 210 reached AQI 101+; the June peak was 270.
- ✓Best June: 2019; worst June: 2023.
Frequently asked questions
What is the air quality like in Milwaukee in June?▾
Across 2019–2025, the median daily AQI in Milwaukee in June was 53 (Moderate). 39.0% of days were Good, 44.8% Moderate, and 16.2% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is June a good time for outdoor exercise in Milwaukee?▾
A typical June day in Milwaukee is Moderate (median AQI 53): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 6 of June days (16.2%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Milwaukee's June air quality problems?▾
Ground-level ozone set the daily AQI on 65.7% of June days in Milwaukee. The highest June AQI recorded in 2019–2025 was 270 (Very Unhealthy), in 2023.
Milwaukee June air quality, year by year
Milwaukee June air quality by year (Milwaukee-Waukesha-West Allis, WI, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 30 | 50 | 1 | 108 | PM2.5 |
| 2020 | 30 | 53 | 4 | 169 | O3 |
| 2021 | 30 | 57 | 5 | 112 | O3 |
| 2022 | 30 | 51 | 3 | 159 | O3 |
| 2023worst | 30 | 97 | 14 | 270 | PM2.5 |
| 2024 | 30 | 47 | 2 | 129 | O3 |
| 2025 | 30 | 57 | 5 | 140 | PM2.5 |
What June air means in Milwaukee
A typical June day in Milwaukee is Moderate (median AQI 53): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 6 of June days (16.2%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
June's median AQI of 53 is above Milwaukee's whole-year median of 49, making it one of the area's dirtier periods. Nationally, the median June AQI across every EPA metro area (100,635 metro-days, 2019–2025) is 46, so Milwaukee runs above the national June norm; 16.2% of its June days topped AQI 100 versus 3.7% nationally (above average).
June is part of Milwaukee's summer season (June, July, August); the summer page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Milwaukee
The latest EPA AirNow observation puts Milwaukee's AQI at 32 (O3). The figures above are multi-year month 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.