Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 55.3 | 12 AM | 53.7 | 02 AM |
| Ashland | Bad River Tribal School | ppb | 39.6 | 12 AM | 40.8 | 12 AM |
| Milwaukee | Bayside | ppb | 69.3 | 12 AM | 80.4 | 05 PM |
| Rock | Beloit-Converse | ppb | 43.7 | 05 PM | 46.5 | 01 PM |
| Kenosha | Chiwaukee Prairie | ppb | 70.3 | 07 PM | 82.7 | 05 PM |
| Columbia | Columbus | ppb | 56 | 12 AM | 34.8 | 09 PM |
| Sauk | Devils Lake | ppb | 43 | 12 AM | 43 | 02 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 47.6 | 05 PM | 54.8 | 03 PM |
| Walworth | Elkhorn | ppb | 63.8 | 12 AM | 51.1 | 02 PM |
| Fond du Lac | Fond Du Lac | ppb | 58.3 | 12 AM | 46.5 | 01 AM |
| Ozaukee | Grafton | ppb | 66.8 | 12 AM | 68.6 | 05 PM |
| Brown | Green Bay UW | ppb | 52.9 | 12 AM | 51.7 | 02 AM |
| Ozaukee | Harrington Beach Park | ppb | 68.2 | 12 AM | 68.1 | 06 PM |
| Dodge | Horicon Wildlife Area | ppb | 62.7 | 12 AM | 48 | 02 PM |
| Jefferson | Jefferson-Laatsch | ppb | 60.8 | 12 AM | 48.1 | 12 AM |
| Kenosha | Kenosha-Water Tower | ppb | 68.6 | 12 AM | 73.1 | 04 PM |
| Kewaunee | Kewaunee | ppb | 66.1 | 12 AM | 55 | 02 AM |
| La Crosse | La Crosse DOT | ppb | 36.5 | 06 PM | 41.2 | 02 PM |
| Marathon | Lake Dubay | ppb | 43.1 | 06 PM | 46.8 | 04 PM |
| Dane | Madison East | ppb | 48.1 | 12 AM | 44.4 | 04 PM |
| Manitowoc | Manitowoc | ppb | 56.2 | 12 AM | 59 | 03 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 61.1 | 12 AM | 60.6 | 04 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 66.5 | 12 AM | 72.7 | 05 PM |
| Door | Newport Park | ppb | 73.2 | 12 AM | 63.2 | 12 AM |
| Forest | Potawatomi | ppb | 51.4 | 12 AM | 48.3 | 12 AM |
| Racine | Racine-Payne & Dolan | ppb | 73.5 | 08 PM | 82.6 | 04 PM |
| Sheboygan | Sheboygan-Haven | ppb | 61.1 | 12 AM | 49.6 | 12 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 69.5 | 12 AM | 61.1 | 03 AM |
| Vilas | Trout Lake | ppb | 45.4 | 12 AM | 43 | 02 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 69.3 | 12 AM | 55.3 | 12 AM |