Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 54.2 | 12 AM | 55 | 12 AM |
| Ashland | Bad River Tribal School | ppb | 41.2 | 12 AM | 41.6 | 12 AM |
| Milwaukee | Bayside | ppb | 52.3 | 04 PM | 56.9 | 11 AM |
| Rock | Beloit-Converse | ppb | 50.4 | 04 PM | 55.2 | 02 PM |
| Kenosha | Chiwaukee Prairie | ppb | 56.3 | 04 PM | 61.2 | 01 PM |
| Columbia | Columbus | ppb | 48.7 | 12 AM | 48.1 | 09 AM |
| Sauk | Devils Lake | ppb | 42.5 | 12 AM | 41.8 | 06 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 37.5 | 12 AM | 40.3 | 01 AM |
| Walworth | Elkhorn | ppb | 55.7 | 04 PM | 59.5 | 12 PM |
| Fond du Lac | Fond Du Lac | ppb | 49.4 | 12 AM | 48.4 | 09 AM |
| Ozaukee | Grafton | ppb | 50.5 | 12 AM | 54.5 | 11 AM |
| Brown | Green Bay UW | ppb | 50.2 | 12 AM | 52.6 | 12 AM |
| Ozaukee | Harrington Beach Park | ppb | 53.6 | 12 AM | 54.8 | 11 AM |
| Dodge | Horicon Wildlife Area | ppb | 52.8 | 12 AM | 48.4 | 10 AM |
| Jefferson | Jefferson-Laatsch | ppb | 43.8 | 12 AM | 48.3 | 11 AM |
| Kenosha | Kenosha-Water Tower | ppb | 56 | 04 PM | 61.7 | 01 PM |
| Kewaunee | Kewaunee | ppb | 53.5 | 12 AM | 54.6 | 12 AM |
| La Crosse | La Crosse DOT | ppb | 41 | 12 AM | 36.7 | 01 AM |
| Marathon | Lake Dubay | ppb | 37.8 | 12 AM | 34.9 | 12 AM |
| Dane | Madison East | ppb | 51.1 | 12 AM | 46.3 | 12 AM |
| Manitowoc | Manitowoc | ppb | 54.4 | 12 AM | 51.3 | 10 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 51.3 | 03 PM | 56 | 12 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 52.6 | 03 PM | 56.9 | 12 PM |
| Door | Newport Park | ppb | 55.6 | 12 AM | 56.7 | 12 AM |
| Forest | Potawatomi | ppb | 43.1 | 03 AM | 42.5 | 12 AM |
| Racine | Racine-Payne & Dolan | ppb | 58.8 | 03 PM | 63.6 | 01 PM |
| Sheboygan | Sheboygan-Haven | ppb | 45.9 | 12 AM | 50.2 | 10 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 53.2 | 12 AM | 57.8 | 10 AM |
| Vilas | Trout Lake | ppb | 44.7 | 12 AM | 45.1 | 12 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 51.5 | 04 PM | 56.5 | 11 AM |