Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 47.3 | 12 AM | 46.8 | 12 AM |
| Ashland | Bad River Tribal School | ppb | 49.2 | 12 AM | 49.2 | 12 AM |
| Milwaukee | Bayside | ppb | 49.6 | 12 AM | 42.7 | 12 AM |
| Rock | Beloit-Converse | ppb | 41.7 | 12 AM | 38.2 | 05 PM |
| Kenosha | Chiwaukee Prairie | ppb | 52.3 | 12 AM | 38.2 | 12 AM |
| Columbia | Columbus | ppb | 51.5 | 12 AM | 42.3 | 12 AM |
| Sauk | Devils Lake | ppb | 39.6 | 04 AM | 41.7 | 01 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 46.1 | 12 AM | 41 | 01 AM |
| Walworth | Elkhorn | ppb | 51.7 | 12 AM | 37.7 | 04 PM |
| Fond du Lac | Fond Du Lac | ppb | 50.4 | 12 AM | 46.1 | 12 AM |
| Ozaukee | Grafton | ppb | 45.4 | 12 AM | 38.4 | 05 PM |
| Brown | Green Bay UW | ppb | 48.6 | 12 AM | 45.2 | 12 AM |
| Ozaukee | Harrington Beach Park | ppb | 46.6 | 12 AM | 45.6 | 12 AM |
| Dodge | Horicon Wildlife Area | ppb | 54 | 12 AM | 47.5 | 12 AM |
| Jefferson | Jefferson-Laatsch | ppb | 53.1 | 12 AM | 39.1 | 04 PM |
| Kenosha | Kenosha-Water Tower | ppb | 51.7 | 12 AM | 36.8 | 01 AM |
| Kewaunee | Kewaunee | ppb | 46.8 | 04 AM | 52.7 | 01 AM |
| La Crosse | La Crosse DOT | ppb | 42.3 | 12 AM | 35.3 | 12 AM |
| Marathon | Lake Dubay | ppb | 45.9 | 12 AM | 43.3 | 12 AM |
| Dane | Madison East | ppb | 46.2 | 12 AM | 43.7 | 08 PM |
| Manitowoc | Manitowoc | ppb | 37.2 | 09 AM | 41 | 03 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 45.8 | 12 AM | 40.7 | 12 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 52.8 | 12 AM | 43.5 | 12 AM |
| Door | Newport Park | ppb | 50 | 12 AM | 46.9 | 10 AM |
| Forest | Potawatomi | ppb | 53.7 | 12 AM | 53.5 | 12 AM |
| Racine | Racine-Payne & Dolan | ppb | 54.9 | 12 AM | 43.7 | 12 AM |
| Sheboygan | Sheboygan-Haven | ppb | 36.2 | 12 AM | 38.7 | 05 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 38.3 | 12 AM | 41.3 | 03 AM |
| Vilas | Trout Lake | ppb | 45.9 | 12 AM | 47.4 | 01 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 53.6 | 12 AM | 42.6 | 12 AM |