Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 37.4 | 12 AM | 36.9 | 01 AM |
| Ashland | Bad River Tribal School | ppb | 35.9 | 12 AM | 32.8 | 12 AM |
| Milwaukee | Bayside | ppb | 33.3 | 12 AM | 26.5 | 12 AM |
| Rock | Beloit-Converse | ppb | 23.7 | 12 AM | 18.4 | 01 AM |
| Kenosha | Chiwaukee Prairie | ppb | 39.6 | 12 AM | 21.4 | 06 AM |
| Columbia | Columbus | ppb | 38 | 12 AM | 34.8 | 12 AM |
| Sauk | Devils Lake | ppb | 40.6 | 12 AM | 39.4 | 12 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 37 | 12 AM | 36.8 | 12 AM |
| Walworth | Elkhorn | ppb | 37.8 | 12 AM | 36.7 | 02 AM |
| Fond du Lac | Fond Du Lac | ppb | 37.3 | 12 AM | 37.1 | 12 AM |
| Ozaukee | Grafton | ppb | 30.6 | 12 AM | 23.2 | 12 AM |
| Brown | Green Bay UW | ppb | 38.6 | 12 AM | 38.8 | 01 AM |
| Ozaukee | Harrington Beach Park | ppb | 40.8 | 12 AM | 25.6 | 12 AM |
| Dodge | Horicon Wildlife Area | ppb | 40.1 | 12 AM | 36.5 | 12 AM |
| Jefferson | Jefferson-Laatsch | ppb | 37.5 | 12 AM | 31.5 | 12 AM |
| Kenosha | Kenosha-Water Tower | ppb | 38.8 | 12 AM | 18.2 | 12 AM |
| Kewaunee | Kewaunee | ppb | 41.9 | 12 AM | 32.8 | 12 AM |
| La Crosse | La Crosse DOT | ppb | 39.4 | 12 AM | 39.9 | 12 AM |
| Marathon | Lake Dubay | ppb | 38.1 | 12 AM | 37.5 | 01 AM |
| Dane | Madison East | ppb | 39.4 | 12 AM | 38.3 | 12 AM |
| Manitowoc | Manitowoc | ppb | 36.4 | 12 AM | 27.6 | 12 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 31 | 12 AM | 30.5 | 12 AM |
| Milwaukee | Milwaukee-SER DNR HQ | ppb | 38.1 | 12 AM | 29.6 | 12 AM |
| Door | Newport Park | ppb | 48.8 | 12 AM | 42.2 | 12 AM |
| Forest | Potawatomi | ppb | 43.6 | 01 AM | 44.6 | 12 AM |
| Racine | Racine-Payne & Dolan | ppb | 41 | 12 AM | 32.3 | 12 AM |
| Sheboygan | Sheboygan-Haven | ppb | 40.6 | 12 AM | 28.6 | 12 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 44.4 | 12 AM | 27.1 | 12 AM |
| Vilas | Trout Lake | ppb | 36.4 | 12 AM | 35.1 | 12 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 30.3 | 12 AM | 19 | 12 AM |