Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 62.9 | 12 AM | 59.7 | 12 AM |
| Ashland | Bad River Tribal School | ppb | 46.2 | 06 PM | 51 | 05 PM |
| Milwaukee | Bayside | ppb | 69.9 | 12 AM | 69 | 05 PM |
| Rock | Beloit-Converse | ppb | 57.1 | 06 PM | 60.2 | 03 PM |
| Kenosha | Chiwaukee Prairie | ppb | 74.2 | 12 AM | 68.7 | 04 PM |
| Columbia | Columbus | ppb | 52.4 | 07 PM | 59.5 | 05 PM |
| Sauk | Devils Lake | ppb | 46.5 | 04 PM | 51.3 | 03 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 47.3 | 06 PM | 53.9 | 05 PM |
| Walworth | Elkhorn | ppb | 62.9 | 05 PM | 64.8 | 04 PM |
| Fond du Lac | Fond Du Lac | ppb | 60.1 | 12 AM | 57.3 | 12 AM |
| Ozaukee | Grafton | ppb | 68.1 | 12 AM | 65.5 | 07 PM |
| Brown | Green Bay UW | ppb | 61.2 | 01 AM | 62.6 | 12 AM |
| Ozaukee | Harrington Beach Park | ppb | 70 | 12 AM | 66.7 | 05 PM |
| Dodge | Horicon Wildlife Area | ppb | 67.2 | 12 AM | 61.6 | 12 AM |
| Jefferson | Jefferson-Laatsch | ppb | 59 | 12 AM | 56.6 | 02 PM |
| Kenosha | Kenosha-Water Tower | ppb | 73.7 | 12 AM | 69.8 | 07 PM |
| Kewaunee | Kewaunee | ppb | 67.1 | 01 AM | 68.3 | 12 AM |
| La Crosse | La Crosse DOT | ppb | 51.2 | 05 PM | 53.2 | 05 PM |
| Marathon | Lake Dubay | ppb | 43.3 | 08 PM | 44.4 | 05 PM |
| Dane | Madison East | ppb | 48.9 | 06 PM | 51.3 | 05 PM |
| Manitowoc | Manitowoc | ppb | 62.2 | 01 AM | 63.9 | 01 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 54.4 | 12 AM | 53.1 | 04 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 68.6 | 12 AM | 67.2 | 03 PM |
| Door | Newport Park | ppb | 64.1 | 03 AM | 70.9 | 02 AM |
| Forest | Potawatomi | ppb | 46.7 | 12 AM | 43.5 | 04 PM |
| Racine | Racine-Payne & Dolan | ppb | 75.3 | 12 AM | 71.2 | 12 AM |
| Sheboygan | Sheboygan-Haven | ppb | 65.6 | 12 AM | 59.4 | 04 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 70.4 | 01 AM | 72.5 | 12 AM |
| Vilas | Trout Lake | ppb | 44.2 | 12 AM | 45.8 | 01 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 64.5 | 12 AM | 64.7 | 03 PM |