Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 38.7 | 03 PM | 42.2 | 12 PM |
| Ashland | Bad River Tribal School | ppb | 47.5 | 12 AM | 36.4 | 12 AM |
| Milwaukee | Bayside | ppb | 48.5 | 02 PM | 58.7 | 12 PM |
| Rock | Beloit-Converse | ppb | 54.6 | 06 PM | 62.6 | 04 PM |
| Kenosha | Chiwaukee Prairie | ppb | 60.9 | 03 PM | 72.7 | 01 PM |
| Columbia | Columbus | ppb | 49.8 | 07 PM | 54.4 | 05 PM |
| Sauk | Devils Lake | ppb | 45.7 | 03 PM | 49.2 | 01 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 49.6 | 04 PM | 55.2 | 12 PM |
| Walworth | Elkhorn | ppb | 56.1 | 04 PM | 59.4 | 01 PM |
| Fond du Lac | Fond Du Lac | ppb | 49.4 | 04 PM | 53.8 | 02 PM |
| Ozaukee | Grafton | ppb | 43.2 | 01 PM | 52.7 | 11 AM |
| Brown | Green Bay UW | ppb | 37 | 12 AM | 38.3 | 12 PM |
| Ozaukee | Harrington Beach Park | ppb | 40.6 | 01 PM | 52.4 | 11 AM |
| Dodge | Horicon Wildlife Area | ppb | 50.4 | 05 PM | 52.7 | 01 PM |
| Jefferson | Jefferson-Laatsch | ppb | 50.9 | 06 PM | 53.6 | 05 PM |
| Kenosha | Kenosha-Water Tower | ppb | 54.9 | 03 PM | 63.7 | 01 PM |
| Kewaunee | Kewaunee | ppb | 34.4 | 04 AM | 36.1 | 09 AM |
| La Crosse | La Crosse DOT | ppb | 50.5 | 06 PM | 54.7 | 02 PM |
| Marathon | Lake Dubay | ppb | 42.2 | 12 AM | 41.2 | 12 PM |
| Dane | Madison East | ppb | 51.7 | 06 PM | 55.5 | 01 PM |
| Manitowoc | Manitowoc | ppb | 34.4 | 11 AM | 38.6 | 10 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 49 | 02 PM | 58.4 | 11 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 50.2 | 01 PM | 58.1 | 11 AM |
| Door | Newport Park | ppb | 38.6 | 03 AM | 39.6 | 12 AM |
| Forest | Potawatomi | ppb | ||||
| Racine | Racine-Payne & Dolan | ppb | 54 | 02 PM | 64.3 | 11 AM |
| Sheboygan | Sheboygan-Haven | ppb | 37.3 | 11 AM | 44.5 | 10 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 37.2 | 01 PM | 46.8 | 10 AM |
| Vilas | Trout Lake | ppb | 44.8 | 12 AM | 38.3 | 02 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 51.9 | 02 PM | 61.6 | 01 PM |