Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 44.5 | 06 PM | 47 | 03 PM |
| Ashland | Bad River Tribal School | ppb | 40.1 | 05 AM | 43.9 | 12 AM |
| Milwaukee | Bayside | ppb | 51.3 | 12 AM | 50 | 12 AM |
| Rock | Beloit-Converse | ppb | 56.3 | 06 PM | 58.3 | 05 PM |
| Kenosha | Chiwaukee Prairie | ppb | 54.1 | 12 AM | 53.6 | 02 PM |
| Columbia | Columbus | ppb | 53.3 | 05 PM | 59.2 | 04 PM |
| Sauk | Devils Lake | ppb | 57.1 | 07 PM | 59.5 | 04 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 44.4 | 04 AM | 44.9 | 12 AM |
| Walworth | Elkhorn | ppb | 56.9 | 05 PM | 63.1 | 03 PM |
| Fond du Lac | Fond Du Lac | ppb | 43.3 | 08 PM | 44.9 | 05 PM |
| Ozaukee | Grafton | ppb | 52.7 | 12 AM | 51 | 01 AM |
| Brown | Green Bay UW | ppb | 43.1 | 04 PM | 44.7 | 12 PM |
| Ozaukee | Harrington Beach Park | ppb | 52.8 | 12 AM | 54.4 | 12 AM |
| Dodge | Horicon Wildlife Area | ppb | 48.8 | 12 AM | 49.9 | 11 AM |
| Jefferson | Jefferson-Laatsch | ppb | 53.4 | 05 PM | 59.8 | 03 PM |
| Kenosha | Kenosha-Water Tower | ppb | 51.7 | 12 AM | 52.1 | 12 PM |
| Kewaunee | Kewaunee | ppb | 48.8 | 12 AM | 47.1 | 12 AM |
| La Crosse | La Crosse DOT | ppb | 54.4 | 01 AM | 52.1 | 12 AM |
| Marathon | Lake Dubay | ppb | 44.6 | 02 AM | 45.5 | 12 AM |
| Dane | Madison East | ppb | 56 | 06 PM | 58.7 | 05 PM |
| Manitowoc | Manitowoc | ppb | 44.8 | 03 AM | 46 | 01 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 46.6 | 02 AM | 48.9 | 12 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 52.6 | 12 AM | 51.9 | 12 AM |
| Door | Newport Park | ppb | 45.4 | 12 AM | 44.7 | 12 AM |
| Forest | Potawatomi | ppb | 41.5 | 04 PM | 43.9 | 11 AM |
| Racine | Racine-Payne & Dolan | ppb | 46.2 | 12 AM | 43.9 | 12 AM |
| Sheboygan | Sheboygan-Haven | ppb | 49.8 | 12 AM | 49.3 | 12 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 55 | 12 AM | 53.2 | 12 AM |
| Vilas | Trout Lake | ppb | 42.5 | 04 PM | 43.7 | 11 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 49.1 | 04 PM | 51.8 | 12 PM |