Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 50.5 | 05 AM | 60.1 | 12 AM |
| Ashland | Bad River Tribal School | ppb | 29.4 | 12 AM | 13 | 12 AM |
| Milwaukee | Bayside | ppb | 51.1 | 02 AM | 54.1 | 01 AM |
| Rock | Beloit-Converse | ppb | 40.1 | 05 AM | 52.7 | 01 AM |
| Kenosha | Chiwaukee Prairie | ppb | 57.1 | 12 AM | 29.9 | 12 AM |
| Columbia | Columbus | ppb | 42.6 | 05 AM | 56 | 12 AM |
| Sauk | Devils Lake | ppb | 50.7 | 05 AM | 61.3 | 12 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 39.8 | 12 AM | 31 | 12 AM |
| Walworth | Elkhorn | ppb | 42.8 | 05 AM | 57.5 | 01 AM |
| Fond du Lac | Fond Du Lac | ppb | 50.2 | 05 AM | 61.2 | 12 AM |
| Ozaukee | Grafton | ppb | 54.7 | 12 AM | 59.5 | 01 AM |
| Brown | Green Bay UW | ppb | 49.3 | 12 AM | 54.4 | 01 AM |
| Ozaukee | Harrington Beach Park | ppb | 63 | 12 AM | 57 | 01 AM |
| Dodge | Horicon Wildlife Area | ppb | 53 | 12 AM | 66.5 | 12 AM |
| Jefferson | Jefferson-Laatsch | ppb | 42.2 | 04 AM | 54.5 | 01 AM |
| Kenosha | Kenosha-Water Tower | ppb | 58.8 | 12 AM | 55.2 | 03 AM |
| Kewaunee | Kewaunee | ppb | 61.5 | 12 AM | 64.8 | 12 AM |
| La Crosse | La Crosse DOT | ppb | 43.1 | 04 AM | 55.2 | 12 AM |
| Marathon | Lake Dubay | ppb | 44.1 | 12 AM | 40.1 | 12 AM |
| Dane | Madison East | ppb | 46.9 | 05 AM | 58.7 | 04 AM |
| Manitowoc | Manitowoc | ppb | 59.1 | 12 AM | 62.2 | 12 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 55.5 | 12 AM | 53.7 | 01 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 59.6 | 12 AM | 57.4 | 03 AM |
| Door | Newport Park | ppb | 47.7 | 12 AM | 40.5 | 12 AM |
| Forest | Potawatomi | ppb | 33.9 | 01 AM | 36.4 | 05 AM |
| Racine | Racine-Payne & Dolan | ppb | 66.2 | 12 AM | 57.3 | 03 AM |
| Sheboygan | Sheboygan-Haven | ppb | 58.3 | 12 AM | 58.6 | 01 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 63.9 | 12 AM | 52.6 | 01 AM |
| Vilas | Trout Lake | ppb | 38.6 | 12 AM | 39.5 | 05 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 51.2 | 12 AM | 57.6 | 01 AM |