Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 43.3 | 05 PM | 48.6 | 11 AM |
| Ashland | Bad River Tribal School | ppb | 21.9 | 04 PM | 28.5 | 04 PM |
| Milwaukee | Bayside | ppb | 66.1 | 12 AM | 65 | 01 PM |
| Rock | Beloit-Converse | ppb | 42.2 | 04 PM | 44.9 | 01 PM |
| Kenosha | Chiwaukee Prairie | ppb | 62.1 | 05 PM | 78.3 | 01 PM |
| Columbia | Columbus | ppb | 42.1 | 05 PM | 45.1 | 12 PM |
| Sauk | Devils Lake | ppb | 39.7 | 04 PM | 44.5 | 02 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 45.7 | 04 PM | 49.7 | 01 PM |
| Walworth | Elkhorn | ppb | 47.4 | 12 AM | 47.7 | 12 PM |
| Fond du Lac | Fond Du Lac | ppb | 50.1 | 12 AM | 46.7 | 01 PM |
| Ozaukee | Grafton | ppb | 73.9 | 12 AM | 65 | 02 PM |
| Brown | Green Bay UW | ppb | 43.2 | 11 PM | 46.5 | 11 AM |
| Ozaukee | Harrington Beach Park | ppb | 68.2 | 12 AM | 71.2 | 02 PM |
| Dodge | Horicon Wildlife Area | ppb | 52.5 | 12 AM | 48.1 | 01 PM |
| Jefferson | Jefferson-Laatsch | ppb | 45.3 | 05 PM | 47.3 | 10 AM |
| Kenosha | Kenosha-Water Tower | ppb | 50.5 | 12 AM | 53.9 | 12 PM |
| Kewaunee | Kewaunee | ppb | 50.5 | 02 AM | 60.8 | 05 PM |
| La Crosse | La Crosse DOT | ppb | 45.8 | 04 AM | 44.9 | 01 AM |
| Marathon | Lake Dubay | ppb | 40.6 | 04 PM | 42.3 | 12 PM |
| Dane | Madison East | ppb | 46.9 | 06 PM | 49.3 | 02 PM |
| Manitowoc | Manitowoc | ppb | 49.3 | 06 PM | 56.9 | 04 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 57.8 | 12 AM | 58.5 | 12 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 64.8 | 12 AM | 68.1 | 01 PM |
| Door | Newport Park | ppb | 48.1 | 01 PM | 50.1 | 10 PM |
| Forest | Potawatomi | ppb | 38.6 | 04 PM | 43.7 | 10 AM |
| Racine | Racine-Payne & Dolan | ppb | 61.3 | 05 PM | 75.8 | 02 PM |
| Sheboygan | Sheboygan-Haven | ppb | 48.2 | 05 PM | 60.4 | 03 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 63.5 | 12 AM | 65.6 | 03 PM |
| Vilas | Trout Lake | ppb | 33.8 | 05 PM | 38.2 | 05 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 60.5 | 12 AM | 50.8 | 12 PM |