Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 56 | 07 PM | 57.9 | 05 PM |
| Ashland | Bad River Tribal School | ppb | 47.5 | 08 PM | 51.1 | 03 PM |
| Milwaukee | Bayside | ppb | 64.8 | 07 PM | 71.3 | 03 PM |
| Rock | Beloit-Converse | ppb | 57.6 | 05 PM | 59.8 | 01 PM |
| Kenosha | Chiwaukee Prairie | ppb | 59.9 | 07 PM | 65.4 | 01 PM |
| Columbia | Columbus | ppb | 54.8 | 06 PM | 60.4 | 03 PM |
| Sauk | Devils Lake | ppb | 43.9 | 09 PM | 46 | 03 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 43 | 12 AM | 45.1 | 09 PM |
| Walworth | Elkhorn | ppb | 60.7 | 06 PM | 66 | 04 PM |
| Fond du Lac | Fond Du Lac | ppb | 56.2 | 06 PM | 58.7 | 03 PM |
| Ozaukee | Grafton | ppb | 65.1 | 06 PM | 72.2 | 02 PM |
| Brown | Green Bay UW | ppb | 57.2 | 07 PM | 59.2 | 05 PM |
| Ozaukee | Harrington Beach Park | ppb | 64 | 06 PM | 70 | 02 PM |
| Dodge | Horicon Wildlife Area | ppb | 56.8 | 07 PM | 59.6 | 05 PM |
| Jefferson | Jefferson-Laatsch | ppb | 55.4 | 06 PM | 58 | 02 PM |
| Kenosha | Kenosha-Water Tower | ppb | 63.3 | 05 PM | 69.7 | 12 PM |
| Kewaunee | Kewaunee | ppb | 59 | 07 PM | 61.5 | 02 PM |
| La Crosse | La Crosse DOT | ppb | 47.3 | 12 AM | 50.1 | 05 PM |
| Marathon | Lake Dubay | ppb | 45.9 | 06 PM | 48.9 | 05 PM |
| Dane | Madison East | ppb | 55 | 07 PM | 58 | 03 PM |
| Manitowoc | Manitowoc | ppb | 61.7 | 07 PM | 64.2 | 03 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 58.7 | 05 PM | 66.7 | 01 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 60.4 | 06 PM | 68 | 01 PM |
| Door | Newport Park | ppb | 59.2 | 09 PM | 61.6 | 06 PM |
| Forest | Potawatomi | ppb | 41.4 | 01 AM | 43.2 | 10 PM |
| Racine | Racine-Payne & Dolan | ppb | 64.3 | 05 PM | 71.8 | 02 PM |
| Sheboygan | Sheboygan-Haven | ppb | 60.6 | 06 PM | 65.8 | 03 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 63.3 | 06 PM | 68.9 | 02 PM |
| Vilas | Trout Lake | ppb | 43.1 | 12 AM | 45.5 | 04 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 67.2 | 06 PM | 72.9 | 04 PM |