Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 30.9 | 03 PM | 33.4 | 12 PM |
| Ashland | Bad River Tribal School | ppb | 25.5 | 12 PM | 27.3 | 07 AM |
| Milwaukee | Bayside | ppb | 38.8 | 05 PM | 40.3 | 02 PM |
| Rock | Beloit-Converse | ppb | 33.7 | 06 PM | 34.8 | 01 PM |
| Kenosha | Chiwaukee Prairie | ppb | 41 | 06 PM | 42.3 | 03 PM |
| Columbia | Columbus | ppb | 31.3 | 06 PM | 33 | 03 PM |
| Sauk | Devils Lake | ppb | 25.9 | 05 PM | 27.7 | 04 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 20.3 | 05 PM | 23.5 | 12 PM |
| Walworth | Elkhorn | ppb | 38.5 | 06 PM | 43.5 | 03 PM |
| Fond du Lac | Fond Du Lac | ppb | 31.3 | 05 PM | 33.7 | 02 PM |
| Ozaukee | Grafton | ppb | 37.3 | 05 PM | 39 | 02 PM |
| Brown | Green Bay UW | ppb | 29.7 | 01 PM | 34 | 11 AM |
| Ozaukee | Harrington Beach Park | ppb | 38.2 | 04 PM | 40.5 | 01 PM |
| Dodge | Horicon Wildlife Area | ppb | 32.4 | 06 PM | 34.8 | 04 PM |
| Jefferson | Jefferson-Laatsch | ppb | 28.5 | 08 PM | 31.7 | 05 PM |
| Kenosha | Kenosha-Water Tower | ppb | 42.6 | 05 PM | 44 | 01 PM |
| Kewaunee | Kewaunee | ppb | 36.3 | 01 PM | 38.2 | 09 AM |
| La Crosse | La Crosse DOT | ppb | 28.4 | 06 PM | 30.3 | 01 PM |
| Marathon | Lake Dubay | ppb | 22 | 03 PM | 24.9 | 01 PM |
| Dane | Madison East | ppb | 30.1 | 05 PM | 31.3 | 04 PM |
| Manitowoc | Manitowoc | ppb | 33 | 02 PM | 35.2 | 10 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 34.9 | 05 PM | 37.1 | 12 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 39.9 | 05 PM | 41.8 | 12 PM |
| Door | Newport Park | ppb | 33.6 | 12 AM | 32 | 04 AM |
| Forest | Potawatomi | ppb | 17.1 | 05 PM | 18.5 | 03 PM |
| Racine | Racine-Payne & Dolan | ppb | 38.4 | 05 PM | 39.8 | 02 PM |
| Sheboygan | Sheboygan-Haven | ppb | 37.3 | 03 PM | 39 | 12 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 39.4 | 03 PM | 41.9 | 01 PM |
| Vilas | Trout Lake | ppb | 20.9 | 12 AM | 21.7 | 11 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 38.1 | 06 PM | 40.6 | 01 PM |