Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 33.8 | 05 PM | 38.1 | 01 PM |
| Ashland | Bad River Tribal School | ppb | 26.2 | 01 PM | 30.7 | 09 AM |
| Milwaukee | Bayside | ppb | 50.7 | 12 AM | 50.6 | 10 AM |
| Rock | Beloit-Converse | ppb | 58.6 | 05 PM | 68.9 | 03 PM |
| Kenosha | Chiwaukee Prairie | ppb | 53.6 | 03 PM | 65 | 12 PM |
| Columbia | Columbus | ppb | 48.9 | 04 PM | 52.5 | 01 PM |
| Sauk | Devils Lake | ppb | 49.2 | 01 AM | 49.9 | 12 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 33.2 | 05 PM | 35.9 | 02 PM |
| Walworth | Elkhorn | ppb | 56.3 | 04 PM | 66.8 | 01 PM |
| Fond du Lac | Fond Du Lac | ppb | 44.5 | 12 AM | 41.7 | 12 AM |
| Ozaukee | Grafton | ppb | 49.3 | 12 AM | 50 | 12 AM |
| Brown | Green Bay UW | ppb | 32.5 | 05 PM | 37 | 02 PM |
| Ozaukee | Harrington Beach Park | ppb | 49.9 | 12 AM | 50.7 | 12 AM |
| Dodge | Horicon Wildlife Area | ppb | 46.1 | 05 PM | 54.7 | 11 AM |
| Jefferson | Jefferson-Laatsch | ppb | 54 | 04 PM | 60.6 | 03 PM |
| Kenosha | Kenosha-Water Tower | ppb | 50.9 | 03 PM | 67.5 | 12 PM |
| Kewaunee | Kewaunee | ppb | 39.3 | 12 AM | 41.3 | 02 PM |
| La Crosse | La Crosse DOT | ppb | 38.5 | 05 PM | 42.8 | 02 PM |
| Marathon | Lake Dubay | ppb | 39.1 | 06 PM | 41.5 | 03 PM |
| Dane | Madison East | ppb | 53.9 | 05 PM | 59.6 | 12 PM |
| Manitowoc | Manitowoc | ppb | 36 | 05 PM | 42.3 | 02 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 48.3 | 12 AM | 51.5 | 10 AM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 51 | 12 AM | 54.9 | 10 AM |
| Door | Newport Park | ppb | 34.3 | 03 PM | 38.6 | 12 PM |
| Forest | Potawatomi | ppb | 35.3 | 05 PM | 38.6 | 01 PM |
| Racine | Racine-Payne & Dolan | ppb | 49.4 | 03 PM | 66.4 | 11 AM |
| Sheboygan | Sheboygan-Haven | ppb | 45.6 | 12 AM | 45.8 | 12 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 46.6 | 12 AM | 44.2 | 12 AM |
| Vilas | Trout Lake | ppb | 30.6 | 04 PM | 33.3 | 01 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 47.7 | 03 PM | 61.2 | 11 AM |