Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 32 | 12 AM | 33.7 | 10 AM |
| Ashland | Bad River Tribal School | ppb | 29.3 | 02 AM | 35.2 | 12 AM |
| Milwaukee | Bayside | ppb | 33.5 | 05 PM | 35.9 | 04 PM |
| Rock | Beloit-Converse | ppb | 32.7 | 12 AM | 33.5 | 02 PM |
| Kenosha | Chiwaukee Prairie | ppb | 32.1 | 07 PM | 40.2 | 01 AM |
| Columbia | Columbus | ppb | 34.2 | 12 AM | 32.1 | 03 PM |
| Sauk | Devils Lake | ppb | 32.4 | 12 AM | 30.8 | 02 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 29.3 | 03 PM | 32.4 | 01 PM |
| Walworth | Elkhorn | ppb | 31.2 | 12 AM | 34.1 | 12 AM |
| Fond du Lac | Fond Du Lac | ppb | 34.4 | 12 AM | 35 | 11 AM |
| Ozaukee | Grafton | ppb | 32.3 | 05 PM | 35.5 | 12 AM |
| Brown | Green Bay UW | ppb | 33.3 | 12 AM | 35.1 | 12 AM |
| Ozaukee | Harrington Beach Park | ppb | 34.9 | 05 PM | 39.5 | 12 AM |
| Dodge | Horicon Wildlife Area | ppb | 36.6 | 12 AM | 35.7 | 12 AM |
| Jefferson | Jefferson-Laatsch | ppb | 32.8 | 12 AM | 32.9 | 03 PM |
| Kenosha | Kenosha-Water Tower | ppb | 29.7 | 05 PM | 39.8 | 01 AM |
| Kewaunee | Kewaunee | ppb | 32.5 | 05 PM | 36.2 | 01 AM |
| La Crosse | La Crosse DOT | ppb | 30.3 | 05 PM | 32.3 | 03 PM |
| Marathon | Lake Dubay | ppb | 29.9 | 12 AM | 28.5 | 12 AM |
| Dane | Madison East | ppb | 35.3 | 12 AM | 31.8 | 03 PM |
| Manitowoc | Manitowoc | ppb | 33.7 | 01 AM | 39.7 | 01 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 30.3 | 05 PM | 34.1 | 02 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 34.2 | 05 PM | 36.4 | 01 PM |
| Door | Newport Park | ppb | 36.4 | 12 AM | 40.2 | 12 PM |
| Forest | Potawatomi | ppb | 30.4 | 12 AM | 32.7 | 07 AM |
| Racine | Racine-Payne & Dolan | ppb | 33.1 | 06 PM | 38.6 | 02 AM |
| Sheboygan | Sheboygan-Haven | ppb | 34.1 | 04 PM | 37.5 | 01 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 33.5 | 12 AM | 41.9 | 12 AM |
| Vilas | Trout Lake | ppb | 29.6 | 04 AM | 36.1 | 04 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 32.5 | 04 PM | 34.6 | 02 PM |