Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 52.5 | 12 AM | 48.2 | 12 AM |
| Ashland | Bad River Tribal School | ppb | 38.7 | 03 PM | 50.3 | 04 AM |
| Milwaukee | Bayside | ppb | 55.1 | 12 AM | 50 | 12 AM |
| Rock | Beloit-Converse | ppb | 46.7 | 12 AM | 42.9 | 12 AM |
| Kenosha | Chiwaukee Prairie | ppb | 51.3 | 12 AM | 42.8 | 12 AM |
| Columbia | Columbus | ppb | 48.7 | 12 AM | 40.3 | 03 PM |
| Sauk | Devils Lake | ppb | 46.3 | 12 AM | 37.8 | 12 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 39.3 | 12 AM | 44.6 | 03 PM |
| Walworth | Elkhorn | ppb | 49.1 | 12 AM | 44.2 | 12 AM |
| Fond du Lac | Fond Du Lac | ppb | 48.9 | 12 AM | 45.5 | 12 AM |
| Ozaukee | Grafton | ppb | 54.2 | 12 AM | 45.6 | 12 AM |
| Brown | Green Bay UW | ppb | 53.2 | 12 AM | 47.5 | 12 AM |
| Ozaukee | Harrington Beach Park | ppb | 62.7 | 12 AM | 52 | 12 AM |
| Dodge | Horicon Wildlife Area | ppb | 53.5 | 12 AM | 46.4 | 12 AM |
| Jefferson | Jefferson-Laatsch | ppb | 47 | 12 AM | 37.7 | 12 AM |
| Kenosha | Kenosha-Water Tower | ppb | 50 | 12 AM | 39.5 | 01 AM |
| Kewaunee | Kewaunee | ppb | 61.4 | 12 AM | 56.6 | 01 AM |
| La Crosse | La Crosse DOT | ppb | 38 | 12 AM | 44 | 03 PM |
| Marathon | Lake Dubay | ppb | 49.4 | 12 AM | 44 | 12 AM |
| Dane | Madison East | ppb | 48.7 | 12 AM | 43.2 | 12 AM |
| Manitowoc | Manitowoc | ppb | 63.6 | 12 AM | 54.3 | 12 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 41.9 | 12 AM | 35.9 | 01 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 49.7 | 12 AM | 46.1 | 12 AM |
| Door | Newport Park | ppb | 64.9 | 12 AM | 63.7 | 12 AM |
| Forest | Potawatomi | ppb | 53.6 | 12 AM | 49.1 | 12 AM |
| Racine | Racine-Payne & Dolan | ppb | 53.2 | 12 AM | 44.5 | 12 AM |
| Sheboygan | Sheboygan-Haven | ppb | 57.9 | 12 AM | 47.9 | 12 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 68.5 | 12 AM | 55.4 | 12 AM |
| Vilas | Trout Lake | ppb | 50.8 | 12 AM | 49.2 | 12 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 50.8 | 12 AM | 43.6 | 12 AM |