Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 24.9 | 05 PM | 31.3 | 03 PM |
| Ashland | Bad River Tribal School | ppb | 18.7 | 10 PM | 21.2 | 12 AM |
| Milwaukee | Bayside | ppb | 31 | 09 AM | 37 | 05 AM |
| Rock | Beloit-Converse | ppb | 32.9 | 02 PM | 34.8 | 11 AM |
| Kenosha | Chiwaukee Prairie | ppb | 31.5 | 10 AM | 39.4 | 06 AM |
| Columbia | Columbus | ppb | 28.9 | 02 PM | 30 | 07 AM |
| Sauk | Devils Lake | ppb | 32.8 | 03 PM | 35.3 | 10 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 28.9 | 05 PM | 35.2 | 01 PM |
| Walworth | Elkhorn | ppb | 28.9 | 01 PM | 32.1 | 08 AM |
| Fond du Lac | Fond Du Lac | ppb | 29.1 | 07 PM | 32.1 | 04 AM |
| Ozaukee | Grafton | ppb | 31.6 | 08 AM | 36.8 | 04 AM |
| Brown | Green Bay UW | ppb | 22.6 | 04 PM | 26.6 | 03 PM |
| Ozaukee | Harrington Beach Park | ppb | 35.1 | 07 AM | 40.3 | 04 AM |
| Dodge | Horicon Wildlife Area | ppb | 31 | 07 PM | 34 | 05 AM |
| Jefferson | Jefferson-Laatsch | ppb | 30.5 | 02 PM | 33 | 07 AM |
| Kenosha | Kenosha-Water Tower | ppb | 29.3 | 11 AM | 34.3 | 06 AM |
| Kewaunee | Kewaunee | ppb | 30.2 | 08 PM | 35.1 | 01 AM |
| La Crosse | La Crosse DOT | ppb | 33.9 | 05 PM | 37.1 | 02 PM |
| Marathon | Lake Dubay | ppb | 36.4 | 07 PM | 38.2 | 05 PM |
| Dane | Madison East | ppb | 29.9 | 03 PM | 32.1 | 09 AM |
| Manitowoc | Manitowoc | ppb | 27.2 | 05 PM | 30.9 | 02 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 27.8 | 09 AM | 33.2 | 04 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 31.7 | 10 PM | 37.2 | 05 AM |
| Door | Newport Park | ppb | 28.9 | 03 PM | 31.5 | 03 PM |
| Forest | Potawatomi | ppb | 37.2 | 05 PM | 39.2 | 11 AM |
| Racine | Racine-Payne & Dolan | ppb | 30.5 | 11 AM | 37.6 | 06 AM |
| Sheboygan | Sheboygan-Haven | ppb | 29.6 | 06 AM | 36.1 | 03 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 31.6 | 07 AM | 37.4 | 03 AM |
| Vilas | Trout Lake | ppb | 22.5 | 06 PM | 29.7 | 02 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 28.4 | 11 AM | 31 | 04 AM |