Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 40 | 12 AM | 33.1 | 12 AM |
| Ashland | Bad River Tribal School | ppb | 49.3 | 12 AM | 48.5 | 12 AM |
| Milwaukee | Bayside | ppb | 41.6 | 12 AM | 42.1 | 03 PM |
| Rock | Beloit-Converse | ppb | 35.2 | 12 AM | 35.7 | 06 PM |
| Kenosha | Chiwaukee Prairie | ppb | 46.2 | 03 PM | 56.6 | 01 PM |
| Columbia | Columbus | ppb | 38.8 | 02 PM | 43.5 | 10 AM |
| Sauk | Devils Lake | ppb | 42.4 | 12 AM | 45.5 | 04 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 46.1 | 12 AM | 39.8 | 12 AM |
| Walworth | Elkhorn | ppb | 38.5 | 12 AM | 38.5 | 11 AM |
| Fond du Lac | Fond Du Lac | ppb | 41.4 | 05 PM | 46.9 | 12 PM |
| Ozaukee | Grafton | ppb | 43.5 | 12 AM | 44.2 | 02 PM |
| Brown | Green Bay UW | ppb | 49.4 | 12 AM | 38.2 | 12 AM |
| Ozaukee | Harrington Beach Park | ppb | 45.4 | 12 AM | 46.1 | 09 AM |
| Dodge | Horicon Wildlife Area | ppb | 40 | 05 PM | 47.9 | 12 PM |
| Jefferson | Jefferson-Laatsch | ppb | 36.1 | 12 AM | 38 | 03 PM |
| Kenosha | Kenosha-Water Tower | ppb | 43.8 | 02 PM | 53.6 | 12 PM |
| Kewaunee | Kewaunee | ppb | 46.1 | 12 AM | 41.7 | 03 PM |
| La Crosse | La Crosse DOT | ppb | 46.2 | 12 AM | 42 | 10 AM |
| Marathon | Lake Dubay | ppb | 46.9 | 12 AM | 42.6 | 01 PM |
| Dane | Madison East | ppb | 38.2 | 12 AM | 40.3 | 01 PM |
| Manitowoc | Manitowoc | ppb | 49.9 | 12 AM | 40.8 | 12 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 38.2 | 12 AM | 39.5 | 11 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 40 | 12 AM | 41.2 | 11 AM |
| Door | Newport Park | ppb | 57.2 | 12 AM | 44.8 | 12 AM |
| Forest | Potawatomi | ppb | 46.5 | 12 AM | 44 | 03 AM |
| Racine | Racine-Payne & Dolan | ppb | 42 | 12 AM | 51.6 | 12 PM |
| Sheboygan | Sheboygan-Haven | ppb | 44.5 | 12 AM | 47.6 | 02 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 47.8 | 12 AM | 50.4 | 01 PM |
| Vilas | Trout Lake | ppb | 50.8 | 12 AM | 49 | 01 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 42.3 | 12 AM | 39.9 | 04 PM |