Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 63.9 | 03 PM | 73.1 | 11 AM |
| Ashland | Bad River Tribal School | ppb | 62.8 | 04 PM | 65.6 | 02 PM |
| Milwaukee | Bayside | ppb | 70.8 | 07 PM | 73.5 | 01 PM |
| Rock | Beloit-Converse | ppb | 75 | 05 PM | 82.7 | 12 PM |
| Kenosha | Chiwaukee Prairie | ppb | 73 | 06 PM | 78.7 | 01 PM |
| Columbia | Columbus | ppb | 75.6 | 05 PM | 79.6 | 01 PM |
| Sauk | Devils Lake | ppb | 74.5 | 05 PM | 76.3 | 02 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 69.8 | 06 PM | 72.4 | 01 PM |
| Walworth | Elkhorn | ppb | 76 | 05 PM | 83.5 | 02 PM |
| Fond du Lac | Fond Du Lac | ppb | 63.7 | 12 AM | 62.9 | 11 AM |
| Ozaukee | Grafton | ppb | 71.1 | 06 PM | 78.6 | 01 PM |
| Brown | Green Bay UW | ppb | 68.3 | 12 AM | 66.4 | 02 AM |
| Ozaukee | Harrington Beach Park | ppb | 69.8 | 07 PM | 74.9 | 01 PM |
| Dodge | Horicon Wildlife Area | ppb | 68.7 | 12 AM | 70.5 | 12 PM |
| Jefferson | Jefferson-Laatsch | ppb | 69.9 | 06 PM | 74.9 | 12 PM |
| Kenosha | Kenosha-Water Tower | ppb | 70.6 | 05 PM | 77.9 | 12 PM |
| Kewaunee | Kewaunee | ppb | 75.4 | 12 AM | 74.5 | 01 AM |
| La Crosse | La Crosse DOT | ppb | 72.5 | 12 AM | 70.9 | 03 PM |
| Marathon | Lake Dubay | ppb | 74.7 | 05 PM | 77.4 | 01 PM |
| Dane | Madison East | ppb | 77.6 | 05 PM | 80.7 | 01 PM |
| Manitowoc | Manitowoc | ppb | 60.3 | 06 PM | 65.2 | 02 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 55.4 | 12 AM | 60.3 | 12 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 67 | 06 PM | 72.7 | 01 PM |
| Door | Newport Park | ppb | 77.8 | 12 AM | 77.7 | 12 AM |
| Forest | Potawatomi | ppb | 74.3 | 12 AM | 77 | 01 PM |
| Racine | Racine-Payne & Dolan | ppb | 71 | 07 PM | 75.9 | 01 PM |
| Sheboygan | Sheboygan-Haven | ppb | 60.6 | 12 AM | 66.8 | 06 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 75.9 | 09 PM | 78.9 | 04 PM |
| Vilas | Trout Lake | ppb | 74.1 | 04 PM | 79.7 | 11 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 63.6 | 12 AM | 68.6 | 11 AM |