Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 20.7 | 01 AM | 22.3 | 12 AM |
| Ashland | Bad River Tribal School | ppb | 30.4 | 03 PM | 33 | 10 AM |
| Milwaukee | Bayside | ppb | 30.2 | 08 AM | 41.5 | 06 AM |
| Rock | Beloit-Converse | ppb | 33 | 09 AM | 44.7 | 05 AM |
| Kenosha | Chiwaukee Prairie | ppb | 41.2 | 11 AM | 49 | 06 AM |
| Columbia | Columbus | ppb | 26 | 12 AM | 37.4 | 05 AM |
| Sauk | Devils Lake | ppb | 24.8 | 12 AM | 30.1 | 03 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 27 | 05 PM | 28.1 | 04 PM |
| Walworth | Elkhorn | ppb | 36.2 | 09 AM | 49.6 | 05 AM |
| Fond du Lac | Fond Du Lac | ppb | 22.5 | 06 PM | 29 | 03 PM |
| Ozaukee | Grafton | ppb | 26.7 | 08 AM | 38.6 | 06 AM |
| Brown | Green Bay UW | ppb | 21.7 | 06 PM | 25.6 | 05 PM |
| Ozaukee | Harrington Beach Park | ppb | 23.1 | 07 AM | 33.7 | 07 AM |
| Dodge | Horicon Wildlife Area | ppb | 21.7 | 07 AM | 37 | 05 AM |
| Jefferson | Jefferson-Laatsch | ppb | 31.9 | 07 AM | 47.2 | 05 AM |
| Kenosha | Kenosha-Water Tower | ppb | 38.1 | 11 AM | 47.5 | 06 AM |
| Kewaunee | Kewaunee | ppb | 24.7 | 06 PM | 27.9 | 05 PM |
| La Crosse | La Crosse DOT | ppb | 31.1 | 12 AM | 31.6 | 05 PM |
| Marathon | Lake Dubay | ppb | 26.5 | 06 PM | 30.9 | 03 PM |
| Dane | Madison East | ppb | 34.1 | 12 AM | 39.1 | 05 AM |
| Manitowoc | Manitowoc | ppb | 21.3 | 06 PM | 26 | 05 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 32.1 | 09 AM | 44 | 06 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 33.1 | 08 AM | 44.1 | 06 AM |
| Door | Newport Park | ppb | 25.4 | 06 PM | 28.2 | 05 PM |
| Forest | Potawatomi | ppb | 30.1 | 06 PM | 31.7 | 05 PM |
| Racine | Racine-Payne & Dolan | ppb | 36 | 10 AM | 46.8 | 06 AM |
| Sheboygan | Sheboygan-Haven | ppb | 23 | 12 AM | 25.6 | 02 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 24.5 | 12 AM | 27.4 | 07 AM |
| Vilas | Trout Lake | ppb | 29.4 | 04 PM | 32.8 | 10 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 28.2 | 12 AM | 42.2 | 06 AM |