Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 46.7 | 12 AM | 43.3 | 12 AM |
| Ashland | Bad River Tribal School | ppb | 34 | 05 AM | 39.6 | 04 AM |
| Milwaukee | Bayside | ppb | 54.9 | 09 PM | 72 | 07 PM |
| Rock | Beloit-Converse | ppb | 46.9 | 06 PM | 53.7 | 02 PM |
| Kenosha | Chiwaukee Prairie | ppb | 78.6 | 05 PM | 93 | 04 PM |
| Columbia | Columbus | ppb | 37.3 | 12 AM | 41.2 | 03 PM |
| Sauk | Devils Lake | ppb | 41.8 | 05 PM | 47.5 | 01 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 38.6 | 05 PM | 43.3 | 12 PM |
| Walworth | Elkhorn | ppb | 46.4 | 05 PM | 48.6 | 02 PM |
| Fond du Lac | Fond Du Lac | ppb | 49.7 | 12 AM | 42.2 | 12 AM |
| Ozaukee | Grafton | ppb | 57.6 | 12 AM | 62.4 | 07 PM |
| Brown | Green Bay UW | ppb | 52.4 | 12 AM | 44.4 | 12 AM |
| Ozaukee | Harrington Beach Park | ppb | 64.9 | 12 AM | 50.2 | 04 AM |
| Dodge | Horicon Wildlife Area | ppb | 41.1 | 12 AM | 42.8 | 01 AM |
| Jefferson | Jefferson-Laatsch | ppb | 39 | 05 PM | 40.8 | 04 PM |
| Kenosha | Kenosha-Water Tower | ppb | 61.5 | 05 PM | 72.7 | 04 PM |
| Kewaunee | Kewaunee | ppb | 64.1 | 12 AM | 49.5 | 12 AM |
| La Crosse | La Crosse DOT | ppb | 36.7 | 04 PM | 40 | 11 AM |
| Marathon | Lake Dubay | ppb | 39.1 | 08 PM | 41.4 | 06 PM |
| Dane | Madison East | ppb | 44.2 | 07 PM | 49.9 | 02 PM |
| Manitowoc | Manitowoc | ppb | 48.7 | 12 AM | 47.1 | 02 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 54.4 | 09 PM | 68.8 | 07 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 52.1 | 08 PM | 69.5 | 07 PM |
| Door | Newport Park | ppb | 73.8 | 12 AM | 70.9 | 12 AM |
| Forest | Potawatomi | ppb | 35.5 | 02 AM | 42.5 | 12 AM |
| Racine | Racine-Payne & Dolan | ppb | 78.7 | 10 PM | 88.1 | 06 PM |
| Sheboygan | Sheboygan-Haven | ppb | 72.8 | 12 AM | 47.8 | 09 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 64 | 12 AM | 54 | 08 AM |
| Vilas | Trout Lake | ppb | 35.2 | 02 PM | 39.8 | 12 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 47.2 | 12 AM | 47.6 | 03 PM |