Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 36.4 | 12 AM | 36.9 | 03 PM |
| Ashland | Bad River Tribal School | ppb | 34.1 | 06 PM | 37 | 04 PM |
| Milwaukee | Bayside | ppb | 51 | 12 AM | 53.6 | 11 AM |
| Rock | Beloit-Converse | ppb | 40.3 | 05 PM | 42.4 | 02 PM |
| Kenosha | Chiwaukee Prairie | ppb | 60.5 | 06 PM | 87.1 | 01 PM |
| Columbia | Columbus | ppb | 38.3 | 04 PM | 40.6 | 03 PM |
| Sauk | Devils Lake | ppb | 40.2 | 07 PM | 44.7 | 02 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 36 | 01 PM | 43 | 01 PM |
| Walworth | Elkhorn | ppb | 38 | 04 PM | 46.1 | 01 PM |
| Fond du Lac | Fond Du Lac | ppb | 41.1 | 03 PM | 46.5 | 10 AM |
| Ozaukee | Grafton | ppb | 57 | 12 AM | 53.5 | 11 AM |
| Brown | Green Bay UW | ppb | 39.1 | 12 AM | 36.6 | 04 PM |
| Ozaukee | Harrington Beach Park | ppb | 60.7 | 12 AM | 58.2 | 11 AM |
| Dodge | Horicon Wildlife Area | ppb | 41.6 | 03 PM | 46 | 09 AM |
| Jefferson | Jefferson-Laatsch | ppb | 39.7 | 04 PM | 49.1 | 11 AM |
| Kenosha | Kenosha-Water Tower | ppb | 44.8 | 05 PM | 52.1 | 10 AM |
| Kewaunee | Kewaunee | ppb | 58.6 | 12 AM | 48.8 | 02 PM |
| La Crosse | La Crosse DOT | ppb | 39.6 | 04 PM | 43.5 | 11 AM |
| Marathon | Lake Dubay | ppb | 28.9 | 06 PM | 35.5 | 02 PM |
| Dane | Madison East | ppb | 38 | 12 AM | 42.4 | 07 PM |
| Manitowoc | Manitowoc | ppb | 52.1 | 12 AM | 49.3 | 07 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 43.9 | 12 AM | 49.7 | 12 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 50.5 | 12 AM | 57.4 | 12 PM |
| Door | Newport Park | ppb | 50 | 12 AM | 40 | 03 PM |
| Forest | Potawatomi | ppb | 34.2 | 04 PM | 38.3 | 01 PM |
| Racine | Racine-Payne & Dolan | ppb | 53.9 | 05 PM | 73.1 | 12 PM |
| Sheboygan | Sheboygan-Haven | ppb | 59.5 | 12 AM | 49.5 | 06 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 61.4 | 12 AM | 60.2 | 11 AM |
| Vilas | Trout Lake | ppb | 37.8 | 05 PM | 42.3 | 04 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 38.3 | 03 PM | 42.2 | 01 PM |