Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 42.1 | 01 AM | 38.3 | 03 AM |
| Ashland | Bad River Tribal School | ppb | 39 | 06 PM | 42.6 | 04 PM |
| Milwaukee | Bayside | ppb | 50.8 | 12 AM | 51.6 | 02 AM |
| Rock | Beloit-Converse | ppb | 41 | 03 AM | 41.1 | 12 AM |
| Kenosha | Chiwaukee Prairie | ppb | 49.8 | 12 AM | 52.4 | 12 AM |
| Columbia | Columbus | ppb | 34.4 | 12 AM | 35.8 | 01 AM |
| Sauk | Devils Lake | ppb | 34.7 | 12 AM | 35.8 | 05 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 37.6 | 08 PM | 42.4 | 03 PM |
| Walworth | Elkhorn | ppb | 33.4 | 11 AM | 37 | 10 AM |
| Fond du Lac | Fond Du Lac | ppb | 41.7 | 12 AM | 37.6 | 12 AM |
| Ozaukee | Grafton | ppb | 50.3 | 12 AM | 51.6 | 03 AM |
| Brown | Green Bay UW | ppb | 42.9 | 02 AM | 45 | 12 AM |
| Ozaukee | Harrington Beach Park | ppb | 55.8 | 12 AM | 54.4 | 03 AM |
| Dodge | Horicon Wildlife Area | ppb | 40.1 | 12 AM | 33.9 | 12 AM |
| Jefferson | Jefferson-Laatsch | ppb | 29.9 | 07 AM | 34.3 | 04 AM |
| Kenosha | Kenosha-Water Tower | ppb | 45.4 | 12 AM | 47.5 | 01 AM |
| Kewaunee | Kewaunee | ppb | 50.5 | 12 AM | 55.2 | 12 AM |
| La Crosse | La Crosse DOT | ppb | 34.7 | 06 PM | 38.6 | 03 PM |
| Marathon | Lake Dubay | ppb | 36.1 | 12 AM | 39.3 | 12 AM |
| Dane | Madison East | ppb | 36.4 | 05 AM | 40.2 | 12 AM |
| Manitowoc | Manitowoc | ppb | 52.6 | 04 AM | 54.6 | 12 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 43.8 | 03 AM | 46.3 | 02 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 51 | 12 AM | 52.5 | 02 AM |
| Door | Newport Park | ppb | 47.5 | 06 AM | 51.4 | 03 AM |
| Forest | Potawatomi | ppb | 45 | 02 AM | 43.3 | 12 AM |
| Racine | Racine-Payne & Dolan | ppb | 50.8 | 12 AM | 50.2 | 01 AM |
| Sheboygan | Sheboygan-Haven | ppb | 48.6 | 12 AM | 51.2 | 12 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 58.4 | 12 AM | 54.4 | 03 AM |
| Vilas | Trout Lake | ppb | 40.1 | 12 AM | 35.4 | 12 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 38.3 | 03 AM | 43 | 02 AM |