Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 47.1 | 12 AM | 64.2 | 11 AM |
| Ashland | Bad River Tribal School | ppb | 46.7 | 11 AM | 52.1 | 11 AM |
| Milwaukee | Bayside | ppb | 30 | 11 AM | 64 | 11 AM |
| Rock | Beloit-Converse | ppb | 45 | 12 AM | 74.6 | 11 AM |
| Kenosha | Chiwaukee Prairie | ppb | 31.6 | 11 AM | 64.9 | 11 AM |
| Columbia | Columbus | ppb | 52 | 12 AM | 65.2 | 11 AM |
| Sauk | Devils Lake | ppb | 53.6 | 11 AM | 62.3 | 11 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 45.8 | 11 AM | 58.7 | 11 AM |
| Walworth | Elkhorn | ppb | 52.6 | 12 AM | 71.9 | 11 AM |
| Fond du Lac | Fond Du Lac | ppb | 56.5 | 12 AM | 64.3 | 11 AM |
| Ozaukee | Grafton | ppb | 34.2 | 11 AM | 65.3 | 11 AM |
| Brown | Green Bay UW | ppb | 53.6 | 12 AM | 63.4 | 11 AM |
| Ozaukee | Harrington Beach Park | ppb | 46.9 | 12 AM | 58.8 | 11 AM |
| Dodge | Horicon Wildlife Area | ppb | 52.6 | 12 AM | 64.5 | 11 AM |
| Jefferson | Jefferson-Laatsch | ppb | 42.6 | 12 AM | 67.6 | 11 AM |
| Kenosha | Kenosha-Water Tower | ppb | 40.4 | 12 AM | 63.8 | 10 AM |
| Kewaunee | Kewaunee | ppb | 53.3 | 12 AM | 57.4 | 11 AM |
| La Crosse | La Crosse DOT | ppb | 44.7 | 08 AM | 50.4 | 02 AM |
| Marathon | Lake Dubay | ppb | 49.6 | 01 AM | 68.3 | 11 AM |
| Dane | Madison East | ppb | 49.1 | 12 AM | 57.2 | 11 AM |
| Manitowoc | Manitowoc | ppb | 33.8 | 11 AM | 57.6 | 10 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 31.3 | 11 AM | 65.6 | 11 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 30.8 | 11 AM | 64.1 | 11 AM |
| Door | Newport Park | ppb | 44.7 | 12 AM | 55.7 | 11 AM |
| Forest | Potawatomi | ppb | 54 | 04 AM | 56.2 | 04 AM |
| Racine | Racine-Payne & Dolan | ppb | 30 | 11 AM | 71.2 | 11 AM |
| Sheboygan | Sheboygan-Haven | ppb | 42.9 | 12 AM | 58.6 | 11 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 50.7 | 12 AM | 58.9 | 11 AM |
| Vilas | Trout Lake | ppb | 53 | 11 AM | 63.8 | 11 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 30.2 | 11 AM | 67.9 | 11 AM |