Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 41.5 | 06 PM | 43.1 | 06 PM |
| Ashland | Bad River Tribal School | ppb | 35.8 | 05 PM | 39.9 | 01 PM |
| Milwaukee | Bayside | ppb | 50.1 | 11 PM | 52.5 | 10 PM |
| Rock | Beloit-Converse | ppb | 46.7 | 06 PM | 51.3 | 05 PM |
| Kenosha | Chiwaukee Prairie | ppb | 52.6 | 11 PM | 55 | 08 PM |
| Columbia | Columbus | ppb | 43.1 | 06 PM | 44.7 | 03 PM |
| Sauk | Devils Lake | ppb | 42.1 | 05 PM | 44.8 | 04 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 48.9 | 06 PM | 52.6 | 05 PM |
| Walworth | Elkhorn | ppb | 45.8 | 06 PM | 48 | 05 PM |
| Fond du Lac | Fond Du Lac | ppb | 44.6 | 06 PM | 47 | 04 PM |
| Ozaukee | Grafton | ppb | 48.7 | 11 PM | 51.8 | 10 PM |
| Brown | Green Bay UW | ppb | 38.5 | 07 PM | 42.1 | 04 PM |
| Ozaukee | Harrington Beach Park | ppb | 47.9 | 11 PM | 51.7 | 11 PM |
| Dodge | Horicon Wildlife Area | ppb | 45.2 | 06 PM | 47 | 04 PM |
| Jefferson | Jefferson-Laatsch | ppb | 43.5 | 05 PM | 44.7 | 02 PM |
| Kenosha | Kenosha-Water Tower | ppb | 49.6 | 11 PM | 51.9 | 11 PM |
| Kewaunee | Kewaunee | ppb | 42.1 | 10 PM | 47 | 09 PM |
| La Crosse | La Crosse DOT | ppb | 47.2 | 08 PM | 50.5 | 05 PM |
| Marathon | Lake Dubay | ppb | 40.4 | 06 PM | 43.1 | 04 PM |
| Dane | Madison East | ppb | 45.5 | 07 PM | 49.4 | 06 PM |
| Manitowoc | Manitowoc | ppb | 44.5 | 10 PM | 45.9 | 09 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 44.3 | 07 PM | 46.5 | 02 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 49.6 | 11 PM | 52.2 | 11 PM |
| Door | Newport Park | ppb | 39.3 | 11 PM | 43.3 | 10 PM |
| Forest | Potawatomi | ppb | 31.6 | 06 PM | 34.6 | 05 PM |
| Racine | Racine-Payne & Dolan | ppb | 52 | 11 PM | 54.3 | 09 PM |
| Sheboygan | Sheboygan-Haven | ppb | 43.4 | 07 PM | 46.5 | 04 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 46.6 | 11 PM | 48 | 06 PM |
| Vilas | Trout Lake | ppb | 33.8 | 05 PM | 36.3 | 03 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 46.8 | 07 PM | 48.6 | 05 PM |