Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 21.6 | 12 AM | 24.4 | 02 AM |
| Ashland | Bad River Tribal School | ppb | 21.3 | 12 AM | 5 | 12 AM |
| Milwaukee | Bayside | ppb | 25 | 02 AM | 25.9 | 12 AM |
| Rock | Beloit-Converse | ppb | 23.5 | 12 AM | 19.6 | 02 AM |
| Kenosha | Chiwaukee Prairie | ppb | 23.6 | 03 AM | 24.4 | 01 AM |
| Columbia | Columbus | ppb | 22.7 | 12 AM | 13.8 | 01 AM |
| Sauk | Devils Lake | ppb | 23.6 | 12 AM | 19.4 | 12 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 16.4 | 12 AM | 12.1 | 12 AM |
| Walworth | Elkhorn | ppb | 22.3 | 12 AM | 23.3 | 01 AM |
| Fond du Lac | Fond Du Lac | ppb | 19.2 | 12 AM | 18.5 | 02 AM |
| Ozaukee | Grafton | ppb | 23.2 | 01 AM | 22.4 | 01 AM |
| Brown | Green Bay UW | ppb | 21.3 | 12 AM | 20.3 | 01 AM |
| Ozaukee | Harrington Beach Park | ppb | 25.4 | 01 AM | 25.2 | 12 AM |
| Dodge | Horicon Wildlife Area | ppb | 20.6 | 12 AM | 17.5 | 03 AM |
| Jefferson | Jefferson-Laatsch | ppb | 21.8 | 12 AM | 18.7 | 01 AM |
| Kenosha | Kenosha-Water Tower | ppb | 24.5 | 03 AM | 25.7 | 12 AM |
| Kewaunee | Kewaunee | ppb | 27.9 | 02 AM | 28.6 | 12 AM |
| La Crosse | La Crosse DOT | ppb | 19.4 | 12 AM | 12.3 | 02 AM |
| Marathon | Lake Dubay | ppb | 26.7 | 12 AM | 23.5 | 02 AM |
| Dane | Madison East | ppb | 23.8 | 12 AM | 18.1 | 01 AM |
| Manitowoc | Manitowoc | ppb | 21.3 | 12 AM | 17.7 | 12 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 21.5 | 03 AM | 22.4 | 01 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 25.1 | 03 AM | 26.1 | 12 AM |
| Door | Newport Park | ppb | 26.9 | 12 AM | 19.9 | 12 AM |
| Forest | Potawatomi | ppb | 22.9 | 12 AM | 19.4 | 01 AM |
| Racine | Racine-Payne & Dolan | ppb | 24 | 03 AM | 25.7 | 02 AM |
| Sheboygan | Sheboygan-Haven | ppb | 25.6 | 12 AM | 22.9 | 12 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 25.6 | 01 AM | 26 | 12 AM |
| Vilas | Trout Lake | ppb | 23.7 | 12 AM | 19.8 | 12 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 20.5 | 02 AM | 22.4 | 12 AM |