Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 62.7 | 07 PM | 66.8 | 02 PM |
| Ashland | Bad River Tribal School | ppb | 49.7 | 07 AM | 52.2 | 01 AM |
| Milwaukee | Bayside | ppb | 69.5 | 06 PM | 71.9 | 04 PM |
| Rock | Beloit-Converse | ppb | 55.2 | 04 PM | 56.2 | 01 PM |
| Kenosha | Chiwaukee Prairie | ppb | 75.5 | 07 PM | 77.7 | 05 PM |
| Columbia | Columbus | ppb | 58.3 | 05 PM | 62.3 | 10 AM |
| Sauk | Devils Lake | ppb | 52.3 | 12 AM | 55.3 | 11 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 49.5 | 05 PM | 55.5 | 11 AM |
| Walworth | Elkhorn | ppb | 60.6 | 05 PM | 69.7 | 04 PM |
| Fond du Lac | Fond Du Lac | ppb | 57.9 | 06 PM | 61.8 | 11 AM |
| Ozaukee | Grafton | ppb | 66.8 | 08 PM | 68.4 | 04 PM |
| Brown | Green Bay UW | ppb | 62 | 06 PM | 66.1 | 02 PM |
| Ozaukee | Harrington Beach Park | ppb | 67.7 | 07 PM | 72.8 | 05 PM |
| Dodge | Horicon Wildlife Area | ppb | 61.5 | 08 PM | 67.6 | 07 PM |
| Jefferson | Jefferson-Laatsch | ppb | 53.9 | 04 PM | 60 | 07 PM |
| Kenosha | Kenosha-Water Tower | ppb | 74.3 | 07 PM | 78.3 | 05 PM |
| Kewaunee | Kewaunee | ppb | 58.6 | 10 PM | 62.5 | 07 PM |
| La Crosse | La Crosse DOT | ppb | 53.5 | 03 PM | 58.6 | 09 AM |
| Marathon | Lake Dubay | ppb | 67.2 | 05 PM | 77.3 | 01 PM |
| Dane | Madison East | ppb | 52.9 | 04 PM | 61.4 | 10 AM |
| Manitowoc | Manitowoc | ppb | 56.5 | 07 PM | 60.4 | 05 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 64.1 | 06 PM | 67.3 | 02 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 68.1 | 10 PM | 69.6 | 04 PM |
| Door | Newport Park | ppb | 51.4 | 05 PM | 56.2 | 05 PM |
| Forest | Potawatomi | ppb | 49.8 | 12 AM | 50.6 | 06 PM |
| Racine | Racine-Payne & Dolan | ppb | 72.5 | 06 PM | 74.2 | 06 PM |
| Sheboygan | Sheboygan-Haven | ppb | 67.8 | 08 PM | 70.4 | 04 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 70 | 08 PM | 72.6 | 05 PM |
| Vilas | Trout Lake | ppb | 52.3 | 12 AM | 53.4 | 12 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 67.8 | 09 PM | 71.2 | 05 PM |