Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 28.2 | 12 AM | 27.7 | 03 AM |
| Ashland | Bad River Tribal School | ppb | 28.3 | 05 PM | 32.1 | 02 PM |
| Milwaukee | Bayside | ppb | 42.8 | 12 AM | 30.7 | 07 PM |
| Rock | Beloit-Converse | ppb | 52.9 | 07 PM | 57.5 | 04 PM |
| Kenosha | Chiwaukee Prairie | ppb | 55.4 | 05 PM | 65.5 | 12 PM |
| Columbia | Columbus | ppb | 46.3 | 04 PM | 49 | 01 PM |
| Sauk | Devils Lake | ppb | 51.8 | 02 AM | 54.1 | 12 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 27.6 | 06 PM | 34.9 | 02 PM |
| Walworth | Elkhorn | ppb | 47.8 | 05 PM | 54.3 | 02 PM |
| Fond du Lac | Fond Du Lac | ppb | 43 | 05 PM | 50.8 | 03 PM |
| Ozaukee | Grafton | ppb | 39.1 | 12 AM | 32.3 | 02 PM |
| Brown | Green Bay UW | ppb | 30.1 | 12 AM | 30.5 | 01 PM |
| Ozaukee | Harrington Beach Park | ppb | 39.3 | 12 AM | 32.8 | 03 PM |
| Dodge | Horicon Wildlife Area | ppb | 49.4 | 04 PM | 55.4 | 11 AM |
| Jefferson | Jefferson-Laatsch | ppb | 46.7 | 05 PM | 52.8 | 03 PM |
| Kenosha | Kenosha-Water Tower | ppb | 55.8 | 05 PM | 62.4 | 01 PM |
| Kewaunee | Kewaunee | ppb | 33.4 | 12 AM | 33.4 | 02 PM |
| La Crosse | La Crosse DOT | ppb | 48.6 | 12 AM | 49.3 | 04 PM |
| Marathon | Lake Dubay | ppb | 30.5 | 05 PM | 37.8 | 03 PM |
| Dane | Madison East | ppb | 48.1 | 04 PM | 49.6 | 01 PM |
| Manitowoc | Manitowoc | ppb | 30.1 | 12 AM | 30.3 | 02 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 36.9 | 12 AM | 34.5 | 02 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 45.3 | 12 AM | 33.5 | 12 AM |
| Door | Newport Park | ppb | 27.1 | 12 AM | 31.6 | 11 PM |
| Forest | Potawatomi | ppb | 16.3 | 02 PM | 18.4 | 01 PM |
| Racine | Racine-Payne & Dolan | ppb | 44 | 12 AM | 52.5 | 05 PM |
| Sheboygan | Sheboygan-Haven | ppb | 32.4 | 12 AM | 30.3 | 01 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 35.4 | 12 AM | 32 | 02 PM |
| Vilas | Trout Lake | ppb | 22.2 | 11 PM | 25.8 | 07 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 39.9 | 12 AM | 38.4 | 12 AM |