Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 30.2 | 12 AM | 28.9 | 12 AM |
| Ashland | Bad River Tribal School | ppb | 23.7 | 04 PM | 25 | 10 AM |
| Milwaukee | Bayside | ppb | 37 | 03 PM | 38.4 | 12 PM |
| Rock | Beloit-Converse | ppb | 45.2 | 03 PM | 52.5 | 01 PM |
| Kenosha | Chiwaukee Prairie | ppb | ||||
| Columbia | Columbus | ppb | 40 | 12 AM | 32.2 | 12 AM |
| Sauk | Devils Lake | ppb | 26.8 | 07 AM | 28.1 | 01 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 25.3 | 05 PM | 30.9 | 04 PM |
| Walworth | Elkhorn | ppb | 43.2 | 04 PM | 48.8 | 01 PM |
| Fond du Lac | Fond Du Lac | ppb | 35.7 | 12 AM | 31.9 | 04 AM |
| Ozaukee | Grafton | ppb | 35.8 | 02 PM | 37.7 | 10 AM |
| Brown | Green Bay UW | ppb | 33.1 | 12 AM | 30.6 | 11 AM |
| Ozaukee | Harrington Beach Park | ppb | 40.4 | 12 AM | 39.9 | 10 AM |
| Dodge | Horicon Wildlife Area | ppb | 37.6 | 12 AM | 31.8 | 02 AM |
| Jefferson | Jefferson-Laatsch | ppb | 33.6 | 05 PM | 36 | 12 PM |
| Kenosha | Kenosha-Water Tower | ppb | 46 | 12 AM | 43.6 | 11 AM |
| Kewaunee | Kewaunee | ppb | 36.4 | 12 AM | 36.8 | 03 AM |
| La Crosse | La Crosse DOT | ppb | 32.8 | 12 AM | 31.9 | 12 AM |
| Marathon | Lake Dubay | ppb | 26.8 | 12 AM | 27.5 | 12 PM |
| Dane | Madison East | ppb | 27.6 | 02 PM | 30.2 | 10 AM |
| Manitowoc | Manitowoc | ppb | 33.8 | 02 PM | 35.9 | 01 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 37.5 | 12 AM | 37.1 | 12 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 40.5 | 12 AM | 40 | 01 PM |
| Door | Newport Park | ppb | 30.1 | 03 PM | 33.4 | 02 PM |
| Forest | Potawatomi | ppb | 32.4 | 12 AM | 29.2 | 09 AM |
| Racine | Racine-Payne & Dolan | ppb | 46.8 | 12 AM | 42.7 | 09 PM |
| Sheboygan | Sheboygan-Haven | ppb | 38.3 | 12 AM | 37.7 | 02 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 37.1 | 05 PM | 39.3 | 01 PM |
| Vilas | Trout Lake | ppb | 28.5 | 05 PM | 31 | 04 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 38.1 | 02 PM | 40.1 | 01 PM |