Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 42.3 | 12 AM | 39.4 | 12 AM |
| Ashland | Bad River Tribal School | ppb | 45.9 | 12 AM | 42.6 | 12 AM |
| Milwaukee | Bayside | ppb | 27.8 | 12 AM | 5 | 12 AM |
| Rock | Beloit-Converse | ppb | 42.4 | 12 AM | 23.8 | 12 AM |
| Kenosha | Chiwaukee Prairie | ppb | 43.8 | 12 AM | 20.7 | 12 AM |
| Columbia | Columbus | ppb | 37.6 | 12 AM | 34.1 | 12 AM |
| Sauk | Devils Lake | ppb | 38.4 | 12 AM | 34.7 | 12 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 43 | 12 AM | 39.8 | 12 AM |
| Walworth | Elkhorn | ppb | 38.3 | 12 AM | 37 | 12 AM |
| Fond du Lac | Fond Du Lac | ppb | 37.9 | 12 AM | 32.5 | 12 AM |
| Ozaukee | Grafton | ppb | 37.7 | 12 AM | 20.7 | 12 AM |
| Brown | Green Bay UW | ppb | 38 | 12 AM | 37.2 | 12 AM |
| Ozaukee | Harrington Beach Park | ppb | 42.1 | 12 AM | 34.9 | 12 AM |
| Dodge | Horicon Wildlife Area | ppb | 41.7 | 12 AM | 34.8 | 12 AM |
| Jefferson | Jefferson-Laatsch | ppb | 39.5 | 12 AM | 25.5 | 12 AM |
| Kenosha | Kenosha-Water Tower | ppb | 42.8 | 12 AM | 31.1 | 12 AM |
| Kewaunee | Kewaunee | ppb | 40 | 12 AM | 32.7 | 12 AM |
| La Crosse | La Crosse DOT | ppb | 47.3 | 12 AM | 45.9 | 12 AM |
| Marathon | Lake Dubay | ppb | 44.7 | 12 AM | 34.6 | 12 AM |
| Dane | Madison East | ppb | 43.3 | 12 AM | 38.9 | 12 AM |
| Manitowoc | Manitowoc | ppb | 40.7 | 12 AM | 27.1 | 12 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 28 | 12 AM | 21.8 | 12 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 33.2 | 12 AM | 12.1 | 12 AM |
| Door | Newport Park | ppb | 39.9 | 12 AM | 39.1 | 12 AM |
| Forest | Potawatomi | ppb | 41.1 | 12 AM | 40.8 | 12 AM |
| Racine | Racine-Payne & Dolan | ppb | 35 | 12 AM | 21.6 | 12 AM |
| Sheboygan | Sheboygan-Haven | ppb | 37 | 12 AM | 28.3 | 12 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 45.5 | 12 AM | 28.3 | 12 AM |
| Vilas | Trout Lake | ppb | 43.1 | 12 AM | 43.1 | 12 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 36.5 | 12 AM | 15.4 | 12 AM |