Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 53.5 | 05 PM | 58.6 | 03 PM |
| Ashland | Bad River Tribal School | ppb | 31.2 | 05 PM | 34.5 | 04 PM |
| Milwaukee | Bayside | ppb | 84.6 | 06 PM | 103.2 | 03 PM |
| Rock | Beloit-Converse | ppb | 53.1 | 06 PM | 55.5 | 03 PM |
| Kenosha | Chiwaukee Prairie | ppb | 81.6 | 05 PM | 93.6 | 01 PM |
| Columbia | Columbus | ppb | 48.3 | 05 PM | 53.3 | 03 PM |
| Sauk | Devils Lake | ppb | 43.2 | 12 AM | 45 | 01 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 43.4 | 05 PM | 46.2 | 02 PM |
| Walworth | Elkhorn | ppb | 51 | 06 PM | 54.7 | 02 PM |
| Fond du Lac | Fond Du Lac | ppb | 52.7 | 10 PM | 61.4 | 08 PM |
| Ozaukee | Grafton | ppb | 91.1 | 07 PM | 107.3 | 03 PM |
| Brown | Green Bay UW | ppb | 55.9 | 12 AM | 58 | 08 PM |
| Ozaukee | Harrington Beach Park | ppb | 91 | 07 PM | 105.1 | 04 PM |
| Dodge | Horicon Wildlife Area | ppb | 51.9 | 07 PM | 60.2 | 03 PM |
| Jefferson | Jefferson-Laatsch | ppb | 53.4 | 04 PM | 56.7 | 01 PM |
| Kenosha | Kenosha-Water Tower | ppb | 64 | 05 PM | 68.9 | 02 PM |
| Kewaunee | Kewaunee | ppb | 72.7 | 08 PM | 81.3 | 05 PM |
| La Crosse | La Crosse DOT | ppb | 40.6 | 06 PM | 44.3 | 02 PM |
| Marathon | Lake Dubay | ppb | 43.9 | 04 PM | 51.3 | 10 PM |
| Dane | Madison East | ppb | 50.5 | 07 PM | 53.6 | 04 PM |
| Manitowoc | Manitowoc | ppb | 79.4 | 07 PM | 90.4 | 05 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 50.9 | 06 PM | 53.8 | 04 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 71.3 | 06 PM | 86.5 | 02 PM |
| Door | Newport Park | ppb | 72.5 | 11 PM | 78.6 | 10 PM |
| Forest | Potawatomi | ppb | 45.1 | 12 AM | 45.2 | 11 PM |
| Racine | Racine-Payne & Dolan | ppb | 84.7 | 06 PM | 102.5 | 02 PM |
| Sheboygan | Sheboygan-Haven | ppb | 81.6 | 09 PM | 93.9 | 06 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 93 | 07 PM | 104.3 | 04 PM |
| Vilas | Trout Lake | ppb | 38.5 | 04 PM | 44.2 | 02 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 57 | 06 PM | 63.9 | 05 PM |