Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 54.9 | 12 AM | 72 | 11 AM |
| Ashland | Bad River Tribal School | ppb | 39.5 | 12 AM | 48.4 | 11 AM |
| Milwaukee | Bayside | ppb | 57.6 | 11 AM | 72.3 | 11 AM |
| Rock | Beloit-Converse | ppb | 55.5 | 11 AM | 70.6 | 11 AM |
| Kenosha | Chiwaukee Prairie | ppb | 62.4 | 11 AM | 68.7 | 10 AM |
| Columbia | Columbus | ppb | 65.4 | 11 AM | 73.3 | 11 AM |
| Sauk | Devils Lake | ppb | 66 | 11 AM | 73.6 | 11 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 50.2 | 11 AM | 69 | 11 AM |
| Walworth | Elkhorn | ppb | 66 | 11 AM | 72.9 | 11 AM |
| Fond du Lac | Fond Du Lac | ppb | 59.9 | 12 AM | 66.5 | 11 AM |
| Ozaukee | Grafton | ppb | 58.8 | 11 AM | 72.4 | 10 AM |
| Brown | Green Bay UW | ppb | 52.6 | 12 AM | 63.6 | 11 AM |
| Ozaukee | Harrington Beach Park | ppb | 60.4 | 11 AM | 72.6 | 11 AM |
| Dodge | Horicon Wildlife Area | ppb | 63.2 | 12 AM | 73.3 | 11 AM |
| Jefferson | Jefferson-Laatsch | ppb | 53 | 11 AM | 70 | 11 AM |
| Kenosha | Kenosha-Water Tower | ppb | 60.4 | 12 AM | 67.3 | 10 AM |
| Kewaunee | Kewaunee | ppb | 62.4 | 11 AM | 70.3 | 11 AM |
| La Crosse | La Crosse DOT | ppb | 52.9 | 12 AM | 50.9 | 11 AM |
| Marathon | Lake Dubay | ppb | 59.8 | 12 AM | 70.8 | 11 AM |
| Dane | Madison East | ppb | 54.2 | 12 AM | 74.4 | 10 AM |
| Manitowoc | Manitowoc | ppb | 49.4 | 11 AM | 63.5 | 11 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 53.2 | 11 AM | 61.7 | 11 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 59.1 | 11 AM | 73.8 | 11 AM |
| Door | Newport Park | ppb | 64.4 | 04 AM | 68.5 | 01 AM |
| Forest | Potawatomi | ppb | 63.3 | 12 AM | 67 | 10 AM |
| Racine | Racine-Payne & Dolan | ppb | 62.4 | 11 AM | 69.4 | 10 AM |
| Sheboygan | Sheboygan-Haven | ppb | 55.9 | 11 AM | 66.7 | 11 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 61.2 | 11 AM | 71.6 | 10 AM |
| Vilas | Trout Lake | ppb | 50.5 | 12 AM | 71.4 | 10 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 58.4 | 11 AM | 74.1 | 10 AM |