Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 31.8 | 05 PM | 35 | 01 PM |
| Ashland | Bad River Tribal School | ppb | 22.1 | 04 PM | 24.4 | 11 AM |
| Milwaukee | Bayside | ppb | 30.6 | 06 PM | 32.3 | 03 PM |
| Rock | Beloit-Converse | ppb | 27.4 | 05 PM | 31.4 | 03 PM |
| Kenosha | Chiwaukee Prairie | ppb | 34.2 | 10 PM | 35.9 | 07 PM |
| Columbia | Columbus | ppb | 28.6 | 06 PM | 30.6 | 12 PM |
| Sauk | Devils Lake | ppb | 24.8 | 07 PM | 27.5 | 02 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 24.9 | 05 PM | 28.5 | 03 PM |
| Walworth | Elkhorn | ppb | 27.2 | 06 PM | 30 | 12 PM |
| Fond du Lac | Fond Du Lac | ppb | 31 | 07 PM | 33.2 | 07 PM |
| Ozaukee | Grafton | ppb | 33.2 | 05 PM | 35.5 | 03 PM |
| Brown | Green Bay UW | ppb | 36.9 | 04 PM | 39.4 | 12 PM |
| Ozaukee | Harrington Beach Park | ppb | 33.4 | 04 PM | 36.6 | 03 PM |
| Dodge | Horicon Wildlife Area | ppb | 28.4 | 11 PM | 35.1 | 10 PM |
| Jefferson | Jefferson-Laatsch | ppb | 25.9 | 06 PM | 27.6 | 01 PM |
| Kenosha | Kenosha-Water Tower | ppb | 32.4 | 08 PM | 33.4 | 03 PM |
| Kewaunee | Kewaunee | ppb | 42.9 | 07 PM | 47.9 | 07 PM |
| La Crosse | La Crosse DOT | ppb | 27.5 | 06 PM | 31.1 | 03 PM |
| Marathon | Lake Dubay | ppb | 20.6 | 05 PM | 22.5 | 03 PM |
| Dane | Madison East | ppb | 23.6 | 04 PM | 25.5 | 02 PM |
| Manitowoc | Manitowoc | ppb | 36.4 | 05 PM | 39.6 | 03 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 29.1 | 09 PM | 31.2 | 06 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 31.5 | 06 PM | 32.7 | 03 PM |
| Door | Newport Park | ppb | 43.8 | 04 PM | 46.8 | 02 PM |
| Forest | Potawatomi | ppb | 26.3 | 04 PM | 30.3 | 10 PM |
| Racine | Racine-Payne & Dolan | ppb | 31.6 | 07 PM | 33.5 | 06 PM |
| Sheboygan | Sheboygan-Haven | ppb | 34.7 | 05 PM | 37.8 | 01 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 34.8 | 05 PM | 39.2 | 08 PM |
| Vilas | Trout Lake | ppb | 25.8 | 12 AM | 27.4 | 02 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 27.6 | 06 PM | 29.9 | 04 PM |