Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 41.3 | 05 PM | 44.6 | 02 PM |
| Ashland | Bad River Tribal School | ppb | 29.2 | 02 AM | 32.5 | 02 AM |
| Milwaukee | Bayside | ppb | 47.7 | 06 PM | 54 | 04 PM |
| Rock | Beloit-Converse | ppb | 39.7 | 03 PM | 43.8 | 02 PM |
| Kenosha | Chiwaukee Prairie | ppb | 56.1 | 12 AM | 57.5 | 02 PM |
| Columbia | Columbus | ppb | 34.9 | 05 PM | 38.7 | 03 PM |
| Sauk | Devils Lake | ppb | 33.1 | 04 PM | 35.9 | 04 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 34 | 05 PM | 38.5 | 01 PM |
| Walworth | Elkhorn | ppb | 43.8 | 05 PM | 47.6 | 04 AM |
| Fond du Lac | Fond Du Lac | ppb | 35.3 | 04 PM | 39.1 | 03 PM |
| Ozaukee | Grafton | ppb | 43.7 | 06 PM | 51.9 | 04 PM |
| Brown | Green Bay UW | ppb | 44.2 | 05 PM | 46.9 | 01 PM |
| Ozaukee | Harrington Beach Park | ppb | 49.2 | 07 PM | 56.6 | 04 PM |
| Dodge | Horicon Wildlife Area | ppb | 38.2 | 05 PM | 41 | 03 PM |
| Jefferson | Jefferson-Laatsch | ppb | 37.9 | 05 PM | 42.1 | 04 AM |
| Kenosha | Kenosha-Water Tower | ppb | 60 | 12 AM | 59.5 | 02 PM |
| Kewaunee | Kewaunee | ppb | 38.4 | 06 PM | 43.1 | 04 PM |
| La Crosse | La Crosse DOT | ppb | 36 | 05 PM | 40.6 | 02 PM |
| Marathon | Lake Dubay | ppb | ||||
| Dane | Madison East | ppb | 37.6 | 06 PM | 39.9 | 03 PM |
| Manitowoc | Manitowoc | ppb | 44.4 | 06 PM | 52.7 | 04 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 41.9 | 03 AM | 50.2 | 12 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 46.5 | 05 PM | 54.8 | 12 AM |
| Door | Newport Park | ppb | 46.1 | 06 PM | 49.7 | 03 PM |
| Forest | Potawatomi | ppb | 29.7 | 12 PM | 31.3 | 10 AM |
| Racine | Racine-Payne & Dolan | ppb | 61.3 | 12 AM | 59.4 | 01 PM |
| Sheboygan | Sheboygan-Haven | ppb | 37.6 | 08 PM | 42.2 | 08 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 54.1 | 07 PM | 59.6 | 05 PM |
| Vilas | Trout Lake | ppb | 26.4 | 12 AM | 28.6 | 12 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 38.7 | 05 PM | 44.1 | 02 PM |