Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 44.7 | 04 PM | 46 | 02 PM |
| Ashland | Bad River Tribal School | ppb | 45 | 09 PM | 46.5 | 09 PM |
| Milwaukee | Bayside | ppb | 55 | 10 PM | 57.7 | 05 PM |
| Rock | Beloit-Converse | ppb | 51.5 | 11 PM | 63.1 | 10 PM |
| Kenosha | Chiwaukee Prairie | ppb | 59.1 | 08 PM | 62.4 | 04 PM |
| Columbia | Columbus | ppb | 50.3 | 08 PM | 53.1 | 08 PM |
| Sauk | Devils Lake | ppb | 56.2 | 11 PM | 67.8 | 08 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 47.2 | 07 PM | 52.1 | 03 PM |
| Walworth | Elkhorn | ppb | 57.7 | 11 PM | 70.9 | 09 PM |
| Fond du Lac | Fond Du Lac | ppb | 48.8 | 11 PM | 51.5 | 06 PM |
| Ozaukee | Grafton | ppb | 54.1 | 11 PM | 57.6 | 06 PM |
| Brown | Green Bay UW | ppb | 44.9 | 08 PM | 45.9 | 07 PM |
| Ozaukee | Harrington Beach Park | ppb | 54.9 | 11 PM | 57.4 | 07 PM |
| Dodge | Horicon Wildlife Area | ppb | 51.8 | 08 PM | 54.5 | 06 PM |
| Jefferson | Jefferson-Laatsch | ppb | 56.8 | 11 PM | 64.1 | 11 PM |
| Kenosha | Kenosha-Water Tower | ppb | 57.4 | 08 PM | 60.8 | 04 PM |
| Kewaunee | Kewaunee | ppb | 47.5 | 10 PM | 50.2 | 07 PM |
| La Crosse | La Crosse DOT | ppb | 49.2 | 12 AM | 52.7 | 10 PM |
| Marathon | Lake Dubay | ppb | 49.5 | 05 PM | 53.3 | 02 PM |
| Dane | Madison East | ppb | 55.8 | 11 PM | 64.7 | 09 PM |
| Manitowoc | Manitowoc | ppb | 48 | 08 PM | 50.6 | 06 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 48 | 09 PM | 51.5 | 06 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 53.8 | 09 PM | 56.8 | 06 PM |
| Door | Newport Park | ppb | 47.5 | 11 PM | 48.2 | 06 PM |
| Forest | Potawatomi | ppb | 49.8 | 07 PM | 52 | 04 PM |
| Racine | Racine-Payne & Dolan | ppb | 58.2 | 09 PM | 61.3 | 05 PM |
| Sheboygan | Sheboygan-Haven | ppb | 46.1 | 11 PM | 50.5 | 06 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 52.1 | 11 PM | 56.2 | 06 PM |
| Vilas | Trout Lake | ppb | 49.9 | 07 PM | 51.6 | 06 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 55.9 | 11 PM | 58.9 | 11 PM |