Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 24.6 | 06 AM | 28.8 | 04 AM |
| Ashland | Bad River Tribal School | ppb | 16.6 | 04 PM | 20 | 02 PM |
| Milwaukee | Bayside | ppb | 47.4 | 12 AM | 40.6 | 12 AM |
| Rock | Beloit-Converse | ppb | 32.9 | 12 AM | 27.3 | 12 AM |
| Kenosha | Chiwaukee Prairie | ppb | 41.5 | 12 AM | 24.9 | 12 AM |
| Columbia | Columbus | ppb | 21.1 | 12 AM | 19.1 | 12 AM |
| Sauk | Devils Lake | ppb | 16.5 | 07 AM | 20.8 | 04 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 21.5 | 04 PM | 23.6 | 03 PM |
| Walworth | Elkhorn | ppb | 31.4 | 12 AM | 25.2 | 12 AM |
| Fond du Lac | Fond Du Lac | ppb | 37.6 | 04 AM | 39 | 12 AM |
| Ozaukee | Grafton | ppb | 47 | 01 AM | 41 | 12 AM |
| Brown | Green Bay UW | ppb | 29.4 | 10 AM | 41.4 | 07 AM |
| Ozaukee | Harrington Beach Park | ppb | 51.4 | 12 AM | 49.7 | 12 AM |
| Dodge | Horicon Wildlife Area | ppb | 34 | 12 AM | 34.4 | 12 AM |
| Jefferson | Jefferson-Laatsch | ppb | 32.5 | 12 AM | 28.5 | 12 AM |
| Kenosha | Kenosha-Water Tower | ppb | 39.4 | 12 AM | 24.4 | 12 AM |
| Kewaunee | Kewaunee | ppb | 48.2 | 03 AM | 51.1 | 01 AM |
| La Crosse | La Crosse DOT | ppb | 20.7 | 05 PM | 23.2 | 03 PM |
| Marathon | Lake Dubay | ppb | 24.7 | 04 PM | 30 | 01 AM |
| Dane | Madison East | ppb | 20.9 | 12 AM | 20.7 | 10 PM |
| Manitowoc | Manitowoc | ppb | 42.4 | 03 AM | 47.9 | 12 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 41.9 | 12 AM | 37.6 | 12 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 47.4 | 12 AM | 41 | 12 AM |
| Door | Newport Park | ppb | 42.3 | 06 AM | 46.9 | 05 AM |
| Forest | Potawatomi | ppb | 26.5 | 01 PM | 31.3 | 12 PM |
| Racine | Racine-Payne & Dolan | ppb | 45.9 | 12 AM | 32.1 | 12 AM |
| Sheboygan | Sheboygan-Haven | ppb | 45.6 | 03 AM | 48.6 | 10 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 51.8 | 02 AM | 53.5 | 12 AM |
| Vilas | Trout Lake | ppb | 19.8 | 08 AM | 21.6 | 04 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 40.7 | 12 AM | 39.6 | 12 AM |