Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 40.7 | 12 AM | 40.2 | 05 PM |
| Ashland | Bad River Tribal School | ppb | 24.1 | 04 PM | 27.2 | 02 PM |
| Milwaukee | Bayside | ppb | 54.3 | 12 AM | 53.7 | 12 PM |
| Rock | Beloit-Converse | ppb | 50.6 | 05 PM | 52.7 | 03 PM |
| Kenosha | Chiwaukee Prairie | ppb | 52.7 | 12 AM | 47.2 | 02 PM |
| Columbia | Columbus | ppb | 41.2 | 12 AM | 45.5 | 12 PM |
| Sauk | Devils Lake | ppb | 34.1 | 03 PM | 41 | 11 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 33 | 05 PM | 39.4 | 12 PM |
| Walworth | Elkhorn | ppb | 49.4 | 04 PM | 52.4 | 12 PM |
| Fond du Lac | Fond Du Lac | ppb | 45.6 | 12 AM | 45.2 | 01 PM |
| Ozaukee | Grafton | ppb | 56.2 | 12 AM | 59.1 | 01 PM |
| Brown | Green Bay UW | ppb | 52.7 | 12 AM | 42.2 | 02 PM |
| Ozaukee | Harrington Beach Park | ppb | 59.3 | 12 AM | 61.7 | 01 PM |
| Dodge | Horicon Wildlife Area | ppb | 45.4 | 03 PM | 48.8 | 10 AM |
| Jefferson | Jefferson-Laatsch | ppb | 48.1 | 03 PM | 50.8 | 02 PM |
| Kenosha | Kenosha-Water Tower | ppb | 50.3 | 12 AM | 49.7 | 02 PM |
| Kewaunee | Kewaunee | ppb | 59.4 | 12 AM | 50.6 | 12 AM |
| La Crosse | La Crosse DOT | ppb | 29.3 | 06 PM | 40.5 | 03 PM |
| Marathon | Lake Dubay | ppb | 34.4 | 06 PM | 38.3 | 01 PM |
| Dane | Madison East | ppb | 47.4 | 12 AM | 44.9 | 01 AM |
| Manitowoc | Manitowoc | ppb | 60.3 | 12 AM | 54.2 | 03 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 48.8 | 04 PM | 51.8 | 01 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 55.1 | 12 AM | 53.1 | 01 PM |
| Door | Newport Park | ppb | 63.2 | 12 AM | 53.2 | 12 AM |
| Forest | Potawatomi | ppb | 32.2 | 12 AM | 32.2 | 11 AM |
| Racine | Racine-Payne & Dolan | ppb | 51 | 12 AM | 46.5 | 12 PM |
| Sheboygan | Sheboygan-Haven | ppb | 57.8 | 12 AM | 56.7 | 03 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 62.8 | 12 AM | 63.4 | 02 PM |
| Vilas | Trout Lake | ppb | 32.4 | 12 AM | 29.3 | 04 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 54.7 | 04 PM | 57.1 | 02 PM |