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 | 28.2 | 02 AM |
| Ashland | Bad River Tribal School | ppb | 40.2 | 04 PM | 41.8 | 11 AM |
| Milwaukee | Bayside | ppb | 38.9 | 04 PM | 46.6 | 02 PM |
| Rock | Beloit-Converse | ppb | 41.1 | 04 PM | 47.2 | 03 PM |
| Kenosha | Chiwaukee Prairie | ppb | 31.2 | 05 PM | 40.1 | 05 PM |
| Columbia | Columbus | ppb | 42.6 | 06 PM | 47.5 | 03 PM |
| Sauk | Devils Lake | ppb | 26.6 | 12 AM | 31.3 | 08 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 43 | 05 PM | 47.2 | 02 PM |
| Walworth | Elkhorn | ppb | 30.6 | 10 AM | 34.7 | 09 AM |
| Fond du Lac | Fond Du Lac | ppb | 42.4 | 05 PM | 45.7 | 02 PM |
| Ozaukee | Grafton | ppb | 42.9 | 04 PM | 48.6 | 02 PM |
| Brown | Green Bay UW | ppb | 42.7 | 06 PM | 48.8 | 01 PM |
| Ozaukee | Harrington Beach Park | ppb | ||||
| Dodge | Horicon Wildlife Area | ppb | 45.3 | 06 PM | 48.7 | 03 PM |
| Jefferson | Jefferson-Laatsch | ppb | 22.9 | 12 AM | 11.3 | 12 AM |
| Kenosha | Kenosha-Water Tower | ppb | 35.3 | 06 PM | 46.6 | 01 PM |
| Kewaunee | Kewaunee | ppb | 32.3 | 12 AM | 31.6 | 08 AM |
| La Crosse | La Crosse DOT | ppb | 29.1 | 03 PM | 47 | 01 PM |
| Marathon | Lake Dubay | ppb | 46.6 | 06 PM | 51.1 | 04 PM |
| Dane | Madison East | ppb | 40.8 | 05 PM | 46.8 | 02 PM |
| Manitowoc | Manitowoc | ppb | 31.9 | 12 AM | 27.4 | 12 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 22.8 | 12 AM | 19.2 | 12 AM |
| Door | Newport Park | ppb | 36 | 12 AM | 35.7 | 03 AM |
| Forest | Potawatomi | ppb | 45.4 | 05 PM | 47.4 | 03 PM |
| Racine | Racine-Payne & Dolan | ppb | 36.1 | 04 PM | 42.9 | 12 PM |
| Sheboygan | Sheboygan-Haven | ppb | 35.7 | 12 AM | 40.4 | 09 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 30.2 | 12 AM | 40.8 | 10 AM |
| Vilas | Trout Lake | ppb | ||||
| Waukesha | Waukesha-Cleveland Ave. | ppb | 27.5 | 12 AM | 16.7 | 12 AM |