Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 31.4 | 12 AM | 25.1 | 12 AM |
| Ashland | Bad River Tribal School | ppb | 31.5 | 12 AM | 24.2 | 01 AM |
| Milwaukee | Bayside | ppb | 47.2 | 11 PM | 55 | 09 PM |
| Rock | Beloit-Converse | ppb | 34.8 | 10 PM | 39 | 10 PM |
| Kenosha | Chiwaukee Prairie | ppb | 44.3 | 02 AM | 53 | 08 PM |
| Columbia | Columbus | ppb | 27.5 | 12 AM | 26.6 | 02 PM |
| Sauk | Devils Lake | ppb | 27.9 | 12 AM | 21.6 | 12 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 30.2 | 12 AM | 25.4 | 12 AM |
| Walworth | Elkhorn | ppb | 34.3 | 07 PM | 38.8 | 03 PM |
| Fond du Lac | Fond Du Lac | ppb | 30.7 | 11 PM | 40.9 | 11 PM |
| Ozaukee | Grafton | ppb | 46.9 | 11 PM | 55.8 | 09 PM |
| Brown | Green Bay UW | ppb | 30.9 | 12 AM | 31.9 | 10 PM |
| Ozaukee | Harrington Beach Park | ppb | 51.2 | 11 PM | 60.9 | 09 PM |
| Dodge | Horicon Wildlife Area | ppb | 33.3 | 11 PM | 38.4 | 09 PM |
| Jefferson | Jefferson-Laatsch | ppb | 33 | 11 PM | 34.8 | 10 PM |
| Kenosha | Kenosha-Water Tower | ppb | 42.8 | 02 AM | 49.5 | 08 PM |
| Kewaunee | Kewaunee | ppb | 43.2 | 11 PM | 48.5 | 10 PM |
| La Crosse | La Crosse DOT | ppb | 30.1 | 12 AM | 28.7 | 12 AM |
| Marathon | Lake Dubay | ppb | 37.4 | 12 AM | 34.2 | 12 PM |
| Dane | Madison East | ppb | 26.7 | 12 AM | 28.4 | 04 PM |
| Manitowoc | Manitowoc | ppb | 35.9 | 04 PM | 43.2 | 08 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 41.3 | 11 PM | 50.6 | 09 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 47 | 11 PM | 55.2 | 09 PM |
| Door | Newport Park | ppb | 37.8 | 12 AM | 42.3 | 02 PM |
| Forest | Potawatomi | ppb | 36.4 | 12 AM | 34.8 | 02 PM |
| Racine | Racine-Payne & Dolan | ppb | 47.4 | 10 PM | 55.6 | 08 PM |
| Sheboygan | Sheboygan-Haven | ppb | 40.9 | 11 PM | 54.5 | 11 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 50.2 | 11 PM | 60.6 | 10 PM |
| Vilas | Trout Lake | ppb | 34.9 | 12 AM | 36.1 | 01 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 40.8 | 11 PM | 45.8 | 09 PM |