Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 21.7 | 12 AM | 20.9 | 12 AM |
| Ashland | Bad River Tribal School | ppb | 25.6 | 07 PM | 27.7 | 06 PM |
| Milwaukee | Bayside | ppb | 44.4 | 12 AM | 28.7 | 02 AM |
| Rock | Beloit-Converse | ppb | 48.8 | 05 PM | 57.7 | 12 AM |
| Kenosha | Chiwaukee Prairie | ppb | 42.1 | 08 AM | 48.1 | 02 AM |
| Columbia | Columbus | ppb | 26.5 | 12 AM | 33 | 12 PM |
| Sauk | Devils Lake | ppb | 30.6 | 12 AM | 31.3 | 09 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 19.4 | 12 AM | 22.3 | 04 PM |
| Walworth | Elkhorn | ppb | 42.3 | 08 AM | 55.6 | 01 AM |
| Fond du Lac | Fond Du Lac | ppb | 26.2 | 12 AM | 26.4 | 12 AM |
| Ozaukee | Grafton | ppb | 34.6 | 12 AM | 25 | 02 AM |
| Brown | Green Bay UW | ppb | 20.2 | 12 AM | 15.7 | 12 AM |
| Ozaukee | Harrington Beach Park | ppb | 36.1 | 12 AM | 25.9 | 08 PM |
| Dodge | Horicon Wildlife Area | ppb | 32.3 | 12 AM | 28.7 | 12 AM |
| Jefferson | Jefferson-Laatsch | ppb | 35.9 | 02 PM | 45.9 | 02 AM |
| Kenosha | Kenosha-Water Tower | ppb | 39.5 | 08 AM | 48.6 | 02 AM |
| Kewaunee | Kewaunee | ppb | 23.7 | 10 PM | 27 | 08 PM |
| La Crosse | La Crosse DOT | ppb | 36.4 | 05 PM | 39.6 | 12 PM |
| Marathon | Lake Dubay | ppb | 28.7 | 12 AM | 17.8 | 03 PM |
| Dane | Madison East | ppb | 35.5 | 12 AM | 43 | 02 PM |
| Manitowoc | Manitowoc | ppb | 22.6 | 12 AM | 20.2 | 07 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 48 | 12 AM | 52.5 | 03 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 44.8 | 12 AM | 49.7 | 03 AM |
| Door | Newport Park | ppb | 22.6 | 11 PM | 24.5 | 10 PM |
| Forest | Potawatomi | ppb | 18.8 | 04 PM | 21 | 02 PM |
| Racine | Racine-Payne & Dolan | ppb | 67.7 | 12 AM | 56.2 | 02 AM |
| Sheboygan | Sheboygan-Haven | ppb | 23.3 | 12 AM | 19.8 | 06 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 32.9 | 12 AM | 25.7 | 10 PM |
| Vilas | Trout Lake | ppb | 26.8 | 03 PM | 28.9 | 11 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 40 | 08 AM | 50.5 | 03 AM |