Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 43.1 | 05 PM | 47 | 01 PM |
| Ashland | Bad River Tribal School | ppb | 37.5 | 12 AM | 36.6 | 09 AM |
| Milwaukee | Bayside | ppb | 53.4 | 06 PM | 58.3 | 02 PM |
| Rock | Beloit-Converse | ppb | 52.3 | 05 PM | 61 | 05 PM |
| Kenosha | Chiwaukee Prairie | ppb | 42.5 | 02 PM | 62 | 12 PM |
| Columbia | Columbus | ppb | 50 | 05 PM | 53.3 | 02 PM |
| Sauk | Devils Lake | ppb | 44 | 05 PM | 49.4 | 02 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 36.8 | 04 PM | 41.7 | 02 PM |
| Walworth | Elkhorn | ppb | 51.2 | 05 PM | 58.6 | 03 PM |
| Fond du Lac | Fond Du Lac | ppb | 48.4 | 06 PM | 52.9 | 02 PM |
| Ozaukee | Grafton | ppb | 54.2 | 05 PM | 58.7 | 02 PM |
| Brown | Green Bay UW | ppb | 44.8 | 05 PM | 49.3 | 12 PM |
| Ozaukee | Harrington Beach Park | ppb | 54.1 | 06 PM | 58.2 | 02 PM |
| Dodge | Horicon Wildlife Area | ppb | 50.1 | 06 PM | 55.7 | 03 PM |
| Jefferson | Jefferson-Laatsch | ppb | 49.9 | 06 PM | 53.3 | 02 PM |
| Kenosha | Kenosha-Water Tower | ppb | 54.8 | 06 PM | 59.2 | 04 PM |
| Kewaunee | Kewaunee | ppb | 46.9 | 05 PM | 51.9 | 01 PM |
| La Crosse | La Crosse DOT | ppb | 39.5 | 06 PM | 43.6 | 01 PM |
| Marathon | Lake Dubay | ppb | 38.2 | 05 PM | 41.7 | 02 PM |
| Dane | Madison East | ppb | 49.2 | 05 PM | 52 | 03 PM |
| Manitowoc | Manitowoc | ppb | 48.4 | 05 PM | 55.1 | 01 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 52.6 | 06 PM | 58.3 | 03 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 55.5 | 05 PM | 61.1 | 03 PM |
| Door | Newport Park | ppb | 46.3 | 04 PM | 52 | 12 PM |
| Forest | Potawatomi | ppb | 38.1 | 05 PM | 39.7 | 02 PM |
| Racine | Racine-Payne & Dolan | ppb | 57.3 | 06 PM | 61.8 | 01 PM |
| Sheboygan | Sheboygan-Haven | ppb | 49.8 | 06 PM | 52.7 | 03 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 50.8 | 06 PM | 59.4 | 02 PM |
| Vilas | Trout Lake | ppb | 35.6 | 04 PM | 39.4 | 12 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 52.1 | 06 PM | 56.7 | 02 PM |