Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 61.6 | 10 PM | 68.6 | 07 PM |
| Ashland | Bad River Tribal School | ppb | 44.1 | 05 PM | 45.9 | 04 PM |
| Milwaukee | Bayside | ppb | 78.1 | 05 PM | 89.7 | 03 PM |
| Rock | Beloit-Converse | ppb | 48.3 | 04 PM | 53.6 | 11 AM |
| Kenosha | Chiwaukee Prairie | ppb | 68.7 | 06 PM | 82.1 | 01 PM |
| Columbia | Columbus | ppb | 50.2 | 05 PM | 54.2 | 12 PM |
| Sauk | Devils Lake | ppb | 42.3 | 05 PM | 45.5 | 04 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 40.7 | 06 PM | 44.9 | 03 PM |
| Walworth | Elkhorn | ppb | 54.4 | 12 AM | 54.1 | 12 AM |
| Fond du Lac | Fond Du Lac | ppb | 57.3 | 08 PM | 66.8 | 06 PM |
| Ozaukee | Grafton | ppb | 77.5 | 06 PM | 84.4 | 01 PM |
| Brown | Green Bay UW | ppb | 57.8 | 09 PM | 60.4 | 09 PM |
| Ozaukee | Harrington Beach Park | ppb | 79.1 | 06 PM | 84.6 | 04 PM |
| Dodge | Horicon Wildlife Area | ppb | 62 | 02 AM | 61.2 | 01 AM |
| Jefferson | Jefferson-Laatsch | ppb | 51.4 | 05 PM | 53.3 | 12 PM |
| Kenosha | Kenosha-Water Tower | ppb | 71.6 | 05 PM | 82.8 | 12 PM |
| Kewaunee | Kewaunee | ppb | 67.4 | 04 PM | 76.4 | 01 PM |
| La Crosse | La Crosse DOT | ppb | 47.1 | 08 PM | 51.6 | 05 PM |
| Marathon | Lake Dubay | ppb | 47.1 | 05 PM | 50.3 | 03 PM |
| Dane | Madison East | ppb | 47.2 | 05 PM | 48.8 | 05 PM |
| Manitowoc | Manitowoc | ppb | 64.4 | 05 PM | 69.3 | 01 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 65.9 | 06 PM | 74.2 | 02 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 73.6 | 06 PM | 84.3 | 03 PM |
| Door | Newport Park | ppb | 66.8 | 07 PM | 69.9 | 03 PM |
| Forest | Potawatomi | ppb | 48.5 | 12 AM | 47.9 | 12 AM |
| Racine | Racine-Payne & Dolan | ppb | 70.8 | 06 PM | 85.5 | 02 PM |
| Sheboygan | Sheboygan-Haven | ppb | 64.7 | 07 PM | 72.5 | 06 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 74.6 | 05 PM | 78.8 | 01 PM |
| Vilas | Trout Lake | ppb | 50.4 | 12 AM | 48.4 | 12 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 62.6 | 12 AM | 76.4 | 03 PM |