Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 51 | 07 PM | 56 | 02 PM |
| Ashland | Bad River Tribal School | ppb | 41.2 | 02 PM | 45.9 | 09 AM |
| Milwaukee | Bayside | ppb | 52.7 | 12 AM | 54.2 | 08 PM |
| Rock | Beloit-Converse | ppb | 63.6 | 05 PM | 71.2 | 03 PM |
| Kenosha | Chiwaukee Prairie | ppb | 58.9 | 12 AM | 58.3 | 01 PM |
| Columbia | Columbus | ppb | 57.5 | 05 PM | 59.7 | 01 PM |
| Sauk | Devils Lake | ppb | 60.8 | 06 PM | 67.6 | 03 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 41.7 | 11 PM | 48.1 | 11 PM |
| Walworth | Elkhorn | ppb | 57.1 | 05 PM | 59.4 | 01 PM |
| Fond du Lac | Fond Du Lac | ppb | 52.4 | 12 AM | 53.8 | 01 PM |
| Ozaukee | Grafton | ppb | 56.8 | 12 AM | 56.2 | 02 PM |
| Brown | Green Bay UW | ppb | 53.9 | 12 AM | 56.6 | 03 PM |
| Ozaukee | Harrington Beach Park | ppb | 54.5 | 07 PM | 57.2 | 07 PM |
| Dodge | Horicon Wildlife Area | ppb | 56.2 | 05 PM | 59.4 | 01 PM |
| Jefferson | Jefferson-Laatsch | ppb | 55.7 | 05 PM | 57.8 | 03 PM |
| Kenosha | Kenosha-Water Tower | ppb | 56.8 | 12 AM | 55.4 | 01 PM |
| Kewaunee | Kewaunee | ppb | 59.9 | 12 AM | 57.1 | 03 PM |
| La Crosse | La Crosse DOT | ppb | 52.2 | 11 PM | 57.1 | 08 PM |
| Marathon | Lake Dubay | ppb | 48.5 | 12 AM | 48.6 | 03 AM |
| Dane | Madison East | ppb | 59.3 | 06 PM | 65.9 | 01 PM |
| Manitowoc | Manitowoc | ppb | 52.2 | 12 AM | 54.2 | 12 AM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 47.5 | 05 PM | 50.9 | 01 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 52.8 | 09 PM | 56.2 | 08 PM |
| Door | Newport Park | ppb | 48 | 07 PM | 52.4 | 03 PM |
| Forest | Potawatomi | ppb | 51.9 | 12 AM | 48.5 | 12 AM |
| Racine | Racine-Payne & Dolan | ppb | 48.6 | 12 AM | 48.4 | 08 PM |
| Sheboygan | Sheboygan-Haven | ppb | 55.5 | 12 AM | 59 | 02 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 58.2 | 07 PM | 61.4 | 01 PM |
| Vilas | Trout Lake | ppb | 54.8 | 03 AM | 55.9 | 01 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 56.4 | 04 PM | 58.2 | 11 AM |