Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 38.5 | 05 PM | 41.2 | 01 PM |
| Ashland | Bad River Tribal School | ppb | 28.4 | 05 PM | 34.4 | 11 PM |
| Milwaukee | Bayside | ppb | 38.1 | 12 AM | 37.2 | 07 AM |
| Rock | Beloit-Converse | ppb | 49.5 | 06 PM | 53 | 03 PM |
| Kenosha | Chiwaukee Prairie | ppb | 46.4 | 12 AM | 48.7 | 01 PM |
| Columbia | Columbus | ppb | 43.2 | 05 PM | 47.5 | 03 PM |
| Sauk | Devils Lake | ppb | 42.6 | 05 PM | 47.9 | 03 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 38.5 | 05 PM | 40 | 04 PM |
| Walworth | Elkhorn | ppb | 45.6 | 05 PM | 49.3 | 02 PM |
| Fond du Lac | Fond Du Lac | ppb | 38.1 | 04 PM | 40 | 02 PM |
| Ozaukee | Grafton | ppb | 36.7 | 12 AM | 37 | 08 AM |
| Brown | Green Bay UW | ppb | 35.2 | 05 PM | 40 | 02 PM |
| Ozaukee | Harrington Beach Park | ppb | 37.7 | 01 PM | 39 | 07 AM |
| Dodge | Horicon Wildlife Area | ppb | 40 | 04 PM | 42.4 | 01 PM |
| Jefferson | Jefferson-Laatsch | ppb | 44.8 | 05 PM | 48 | 03 PM |
| Kenosha | Kenosha-Water Tower | ppb | 42.4 | 04 PM | 44.2 | 02 PM |
| Kewaunee | Kewaunee | ppb | 37.1 | 04 PM | 38.9 | 11 AM |
| La Crosse | La Crosse DOT | ppb | 36.5 | 11 PM | 39.9 | 11 PM |
| Marathon | Lake Dubay | ppb | 37.6 | 06 PM | 39.3 | 03 PM |
| Dane | Madison East | ppb | 45.6 | 06 PM | 50.7 | 02 PM |
| Manitowoc | Manitowoc | ppb | 35.9 | 03 PM | 37.8 | 10 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 38.2 | 12 AM | 35.4 | 12 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 41.6 | 12 AM | 37.6 | 07 AM |
| Door | Newport Park | ppb | 37.3 | 04 PM | 40.7 | 02 PM |
| Forest | Potawatomi | ppb | 34.2 | 07 PM | 36.5 | 07 PM |
| Racine | Racine-Payne & Dolan | ppb | 45.3 | 12 AM | 43.6 | 03 PM |
| Sheboygan | Sheboygan-Haven | ppb | 36.4 | 03 PM | 37.7 | 01 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 36.5 | 12 PM | 38 | 07 AM |
| Vilas | Trout Lake | ppb | 34 | 05 PM | 37.2 | 03 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 38.9 | 04 PM | 41.1 | 02 PM |