Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 58.5 | 12 AM | 54.3 | 03 PM |
| Ashland | Bad River Tribal School | ppb | 32 | 05 PM | 40.1 | 03 PM |
| Milwaukee | Bayside | ppb | 66.2 | 05 PM | 78.4 | 12 PM |
| Rock | Beloit-Converse | ppb | 50.9 | 05 PM | 52.5 | 10 AM |
| Kenosha | Chiwaukee Prairie | ppb | 62.1 | 05 PM | 73 | 11 AM |
| Columbia | Columbus | ppb | 46.3 | 05 PM | 48.3 | 05 PM |
| Sauk | Devils Lake | ppb | 41.4 | 05 PM | 47.7 | 05 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 36.8 | 05 PM | 42.2 | 04 PM |
| Walworth | Elkhorn | ppb | 48.6 | 05 PM | 50.8 | 01 PM |
| Fond du Lac | Fond Du Lac | ppb | 49.4 | 12 AM | 49.1 | 10 AM |
| Ozaukee | Grafton | ppb | 64.7 | 05 PM | 77.8 | 01 PM |
| Brown | Green Bay UW | ppb | 60.3 | 05 PM | 72.8 | 04 PM |
| Ozaukee | Harrington Beach Park | ppb | 69.6 | 05 PM | 83.5 | 01 PM |
| Dodge | Horicon Wildlife Area | ppb | 51.1 | 05 PM | 55.6 | 01 PM |
| Jefferson | Jefferson-Laatsch | ppb | 52.1 | 05 PM | 56.9 | 12 PM |
| Kenosha | Kenosha-Water Tower | ppb | 63.1 | 05 PM | 67 | 12 PM |
| Kewaunee | Kewaunee | ppb | 64.4 | 05 PM | 76.8 | 03 PM |
| La Crosse | La Crosse DOT | ppb | 44.5 | 12 AM | 49 | 02 PM |
| Marathon | Lake Dubay | ppb | 43.7 | 05 PM | 46.9 | 12 PM |
| Dane | Madison East | ppb | 45.7 | 05 PM | 47 | 04 PM |
| Manitowoc | Manitowoc | ppb | 62.7 | 05 PM | 73 | 03 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 54.6 | 05 PM | 58.6 | 02 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 61.9 | 05 PM | 72.4 | 12 PM |
| Door | Newport Park | ppb | 64.1 | 05 PM | 79.1 | 05 PM |
| Forest | Potawatomi | ppb | 37.5 | 05 PM | 41.3 | 05 PM |
| Racine | Racine-Payne & Dolan | ppb | 63.1 | 05 PM | 72.5 | 12 PM |
| Sheboygan | Sheboygan-Haven | ppb | 65.7 | 05 PM | 79.8 | 02 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 70.4 | 05 PM | 83.1 | 02 PM |
| Vilas | Trout Lake | ppb | 41 | 05 PM | 46.3 | 05 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 51.8 | 05 PM | 54.2 | 03 PM |