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 | 46.8 | 12 AM | 46.9 | 12 AM |
| Milwaukee | Bayside | ppb | ||||
| Rock | Beloit-Converse | ppb | ||||
| Kenosha | Chiwaukee Prairie | ppb | 40.8 | 12 AM | 40.1 | 01 AM |
| Columbia | Columbus | ppb | ||||
| Sauk | Devils Lake | ppb | ||||
| Eau Claire | Eau Claire DOT Sign Shop | ppb | ||||
| Walworth | Elkhorn | ppb | ||||
| Fond du Lac | Fond Du Lac | ppb | ||||
| Ozaukee | Grafton | ppb | 31.4 | 01 AM | 35.6 | 12 AM |
| Ozaukee | Harrington Beach Park | ppb | 36.9 | 01 AM | 37.4 | 12 AM |
| Dodge | Horicon Wildlife Area | ppb | 35.8 | 12 AM | 35.7 | 12 AM |
| Jefferson | Jefferson-Laatsch | ppb | 37.2 | 12 AM | 32.1 | 12 AM |
| Kenosha | Kenosha-Water Tower | ppb | 38.9 | 12 AM | 38.5 | 12 AM |
| La Crosse | La Crosse DOT | ppb | ||||
| Marathon | Lake Dubay | ppb | ||||
| Dane | Madison East | ppb | ||||
| Milwaukee | Milwaukee-16th St. Health Center | ppb | ||||
| Milwaukee | Milwaukee-UWM UPark | ppb | 36.6 | 12 AM | ||
| Forest | Potawatomi | ppb | 45.3 | 12 AM | 41.5 | 12 AM |
| Racine | Racine-Payne & Dolan | ppb | ||||
| Sheboygan | Sheboygan-Haven | ppb | 33.9 | 01 AM | 37 | 12 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | ||||
| Vilas | Trout Lake | ppb | ||||
| Waukesha | Waukesha-Cleveland Ave. | ppb | 37.3 | 01 AM | 36.1 | 12 AM |