Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 27.4 | 06 PM | 29 | 02 PM |
| Ashland | Bad River Tribal School | ppb | 26 | 05 PM | 27.6 | 04 PM |
| Milwaukee | Bayside | ppb | 28 | 06 PM | 29.6 | 01 PM |
| Rock | Beloit-Converse | ppb | 27.5 | 06 PM | 29.4 | 05 PM |
| Kenosha | Chiwaukee Prairie | ppb | 28.8 | 07 PM | 32.6 | 02 PM |
| Columbia | Columbus | ppb | 24.8 | 06 PM | 27.7 | 03 PM |
| Sauk | Devils Lake | ppb | 26 | 05 PM | 29.4 | 03 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 26.7 | 05 PM | 28.7 | 03 PM |
| Walworth | Elkhorn | ppb | 30 | 06 PM | 31.3 | 03 PM |
| Fond du Lac | Fond Du Lac | ppb | 29.1 | 05 PM | 32 | 03 PM |
| Ozaukee | Grafton | ppb | 26.6 | 05 PM | 28.8 | 01 PM |
| Brown | Green Bay UW | ppb | 27.5 | 09 PM | 28.4 | 05 PM |
| Ozaukee | Harrington Beach Park | ppb | 29.7 | 05 PM | 31.6 | 03 PM |
| Dodge | Horicon Wildlife Area | ppb | 28.9 | 05 PM | 31.9 | 03 PM |
| Jefferson | Jefferson-Laatsch | ppb | 26.4 | 05 PM | 29.4 | 04 PM |
| Kenosha | Kenosha-Water Tower | ppb | 28.2 | 06 PM | 30.8 | 01 PM |
| Kewaunee | Kewaunee | ppb | 28.2 | 06 PM | 29.5 | 04 PM |
| La Crosse | La Crosse DOT | ppb | 26.3 | 05 PM | 28.1 | 04 PM |
| Marathon | Lake Dubay | ppb | 25.4 | 06 PM | 27.5 | 03 PM |
| Dane | Madison East | ppb | 23.9 | 05 PM | 26.8 | 03 PM |
| Manitowoc | Manitowoc | ppb | 27.3 | 05 PM | 28.8 | 02 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 26.1 | 06 PM | 28.5 | 01 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 29 | 06 PM | 31.1 | 01 PM |
| Door | Newport Park | ppb | 28.1 | 07 PM | 29.2 | 03 PM |
| Forest | Potawatomi | ppb | 24.6 | 05 PM | 26.7 | 04 PM |
| Racine | Racine-Payne & Dolan | ppb | 30.3 | 08 PM | 32 | 02 PM |
| Sheboygan | Sheboygan-Haven | ppb | 27.8 | 05 PM | 29.7 | 02 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 27.7 | 06 PM | 28.8 | 02 PM |
| Vilas | Trout Lake | ppb | 23.6 | 05 PM | 26.5 | 03 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 28.4 | 06 PM | 30.2 | 03 PM |