Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 46.2 | 12 AM | 47.9 | 12 AM |
| Ashland | Bad River Tribal School | ppb | 37.6 | 10 PM | 41.4 | 09 PM |
| Milwaukee | Bayside | ppb | 44.8 | 05 PM | 55.8 | 03 PM |
| Rock | Beloit-Converse | ppb | 41.2 | 12 AM | 38.4 | 12 AM |
| Kenosha | Chiwaukee Prairie | ppb | 60.2 | 12 AM | 57.9 | 02 PM |
| Columbia | Columbus | ppb | 50.7 | 12 AM | 40.7 | 03 PM |
| Sauk | Devils Lake | ppb | 38 | 12 AM | 38.2 | 03 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 35 | 04 PM | 40.6 | 02 PM |
| Walworth | Elkhorn | ppb | 54 | 12 AM | 42.1 | 12 AM |
| Fond du Lac | Fond Du Lac | ppb | 50.2 | 12 AM | 46.3 | 12 AM |
| Ozaukee | Grafton | ppb | 44.7 | 05 PM | 53.2 | 03 PM |
| Brown | Green Bay UW | ppb | 48.8 | 12 AM | 55.3 | 12 AM |
| Ozaukee | Harrington Beach Park | ppb | 52.7 | 07 PM | 61.2 | 03 PM |
| Dodge | Horicon Wildlife Area | ppb | 55.7 | 12 AM | 48.2 | 12 AM |
| Jefferson | Jefferson-Laatsch | ppb | 53.7 | 12 AM | 40.8 | 12 AM |
| Kenosha | Kenosha-Water Tower | ppb | 59.3 | 12 AM | 49.6 | 03 PM |
| Kewaunee | Kewaunee | ppb | 50.7 | 12 AM | 51.7 | 12 AM |
| La Crosse | La Crosse DOT | ppb | 38.5 | 06 PM | 42.8 | 03 PM |
| Marathon | Lake Dubay | ppb | 43 | 12 AM | 41.6 | 04 PM |
| Dane | Madison East | ppb | 44.9 | 12 AM | 43.1 | 12 AM |
| Manitowoc | Manitowoc | ppb | 50.8 | 12 AM | 52 | 04 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 51.7 | 01 AM | 43.7 | 12 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 52.7 | 12 AM | 52.4 | 03 PM |
| Door | Newport Park | ppb | 54 | 12 AM | 52.8 | 04 PM |
| Forest | Potawatomi | ppb | 49.2 | 12 AM | 49.6 | 01 AM |
| Racine | Racine-Payne & Dolan | ppb | 64.1 | 12 AM | 51.1 | 01 PM |
| Sheboygan | Sheboygan-Haven | ppb | 41.5 | 06 PM | 49.4 | 04 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 52.2 | 07 PM | 58.6 | 04 PM |
| Vilas | Trout Lake | ppb | 36 | 03 PM | 40.4 | 01 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 60.1 | 12 AM | 41.6 | 12 AM |