Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | ||||
| Ashland | Bad River Tribal School | ppb | 28.9 | 12 AM | 27.9 | 11 PM |
| Milwaukee | Bayside | ppb | 37.5 | 12 AM | 38.4 | 12 AM |
| Rock | Beloit-Converse | ppb | ||||
| Kenosha | Chiwaukee Prairie | ppb | 43.8 | 07 PM | 48.8 | 03 PM |
| Columbia | Columbus | ppb | 38.2 | 12 AM | 37.4 | 12 AM |
| Sauk | Devils Lake | ppb | ||||
| Eau Claire | Eau Claire DOT Sign Shop | ppb | ||||
| Walworth | Elkhorn | ppb | ||||
| Fond du Lac | Fond Du Lac | ppb | 38.4 | 12 AM | 38.2 | 01 AM |
| Ozaukee | Grafton | ppb | ||||
| Brown | Green Bay UW | ppb | ||||
| Ozaukee | Harrington Beach Park | ppb | ||||
| Dodge | Horicon Wildlife Area | ppb | 39.6 | 12 AM | 41.4 | 02 PM |
| Jefferson | Jefferson-Laatsch | ppb | ||||
| Kenosha | Kenosha-Water Tower | ppb | 37.7 | 07 PM | 40.5 | 06 PM |
| Kewaunee | Kewaunee | ppb | ||||
| La Crosse | La Crosse DOT | ppb | ||||
| Marathon | Lake Dubay | ppb | ||||
| Dane | Madison East | ppb | 44.7 | 08 PM | 50.1 | 03 PM |
| Manitowoc | Manitowoc | ppb | ||||
| Milwaukee | Milwaukee-16th St. Health Center | ppb | ||||
| Milwaukee | Milwaukee-UWM UPark | ppb | 42.2 | 08 PM | 45.6 | 05 PM |
| Door | Newport Park | ppb | ||||
| Forest | Potawatomi | ppb | 46.3 | 12 AM | 43.8 | 12 AM |
| Racine | Racine-Payne & Dolan | ppb | ||||
| Sheboygan | Sheboygan-Haven | ppb | ||||
| Sheboygan | Sheboygan-Kohler Andrae | ppb | ||||
| Vilas | Trout Lake | ppb | ||||
| Waukesha | Waukesha-Cleveland Ave. | ppb |