Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 18.6 | 12 AM | 19.6 | 01 PM |
| Ashland | Bad River Tribal School | ppb | 23.4 | 07 PM | 23.8 | 12 PM |
| Milwaukee | Bayside | ppb | 30.8 | 12 AM | 20.5 | 12 AM |
| Rock | Beloit-Converse | ppb | 21.4 | 06 PM | 24.8 | 02 PM |
| Kenosha | Chiwaukee Prairie | ppb | 30.4 | 01 AM | 38.2 | 12 AM |
| Columbia | Columbus | ppb | 22 | 12 AM | 23 | 04 PM |
| Sauk | Devils Lake | ppb | 21.7 | 07 PM | 23.2 | 04 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 19 | 03 PM | 20.2 | 03 PM |
| Walworth | Elkhorn | ppb | 27.6 | 12 AM | 19.6 | 02 PM |
| Fond du Lac | Fond Du Lac | ppb | 25.3 | 12 AM | 21.1 | 03 PM |
| Ozaukee | Grafton | ppb | 26.3 | 12 AM | 18.7 | 11 PM |
| Brown | Green Bay UW | ppb | 23.4 | 11 PM | 27.8 | 11 PM |
| Ozaukee | Harrington Beach Park | ppb | 27.4 | 12 AM | 22.7 | 03 PM |
| Dodge | Horicon Wildlife Area | ppb | 25.3 | 12 AM | 21.3 | 12 PM |
| Jefferson | Jefferson-Laatsch | ppb | 23.8 | 12 AM | 20.4 | 04 PM |
| Kenosha | Kenosha-Water Tower | ppb | 28 | 01 AM | 28.8 | 12 AM |
| Kewaunee | Kewaunee | ppb | 25.7 | 12 AM | 27.4 | 11 PM |
| La Crosse | La Crosse DOT | ppb | 20.6 | 05 PM | 21 | 01 PM |
| Marathon | Lake Dubay | ppb | 21.2 | 05 PM | 22.3 | 01 PM |
| Dane | Madison East | ppb | 21.6 | 08 PM | 24.5 | 04 PM |
| Manitowoc | Manitowoc | ppb | 25.5 | 12 AM | 22 | 11 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 28.1 | 12 AM | 22.6 | 12 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 33.2 | 12 AM | 22.5 | 12 AM |
| Door | Newport Park | ppb | 25.6 | 11 PM | 27 | 07 PM |
| Forest | Potawatomi | ppb | 19.2 | 03 PM | 20.9 | 02 PM |
| Racine | Racine-Payne & Dolan | ppb | 29.9 | 12 AM | 27.9 | 12 AM |
| Sheboygan | Sheboygan-Haven | ppb | 24.5 | 12 AM | 21.5 | 11 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 23.7 | 12 AM | 22.5 | 02 PM |
| Vilas | Trout Lake | ppb | 22.1 | 03 PM | 22.7 | 11 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 32.8 | 12 AM | 28 | 12 AM |