Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 64.3 | 06 PM | 68 | 12 PM |
| Ashland | Bad River Tribal School | ppb | 58.5 | 04 AM | 59.6 | 02 AM |
| Milwaukee | Bayside | ppb | 74.3 | 07 PM | 78 | 02 PM |
| Rock | Beloit-Converse | ppb | 63.7 | 04 PM | 68.1 | 10 AM |
| Kenosha | Chiwaukee Prairie | ppb | 74.5 | 09 PM | 81.9 | 04 PM |
| Columbia | Columbus | ppb | 56.1 | 09 PM | 70.2 | 09 PM |
| Sauk | Devils Lake | ppb | 50.1 | 05 AM | 59.1 | 11 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 46 | 12 AM | 46.6 | 12 AM |
| Walworth | Elkhorn | ppb | 66.9 | 07 PM | 78.9 | 06 PM |
| Fond du Lac | Fond Du Lac | ppb | 63.7 | 09 PM | 65.5 | 07 PM |
| Ozaukee | Grafton | ppb | 76.1 | 06 PM | 81.4 | 02 PM |
| Brown | Green Bay UW | ppb | 66.4 | 06 PM | 70.5 | 03 PM |
| Ozaukee | Harrington Beach Park | ppb | 74 | 07 PM | 77.5 | 03 PM |
| Dodge | Horicon Wildlife Area | ppb | 65 | 10 PM | 72.7 | 07 PM |
| Jefferson | Jefferson-Laatsch | ppb | 62 | 10 PM | 74.6 | 08 PM |
| Kenosha | Kenosha-Water Tower | ppb | 75.2 | 08 PM | 78 | 02 PM |
| Kewaunee | Kewaunee | ppb | 68.9 | 09 PM | 70.2 | 05 PM |
| La Crosse | La Crosse DOT | ppb | 41.7 | 12 AM | 42.5 | 05 AM |
| Marathon | Lake Dubay | ppb | 56 | 12 AM | 56.1 | 10 AM |
| Dane | Madison East | ppb | 56 | 05 PM | 65.1 | 11 AM |
| Manitowoc | Manitowoc | ppb | 68.6 | 07 PM | 72.8 | 02 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 66.7 | 06 PM | 71.7 | 03 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 71.8 | 06 PM | 75.7 | 03 PM |
| Door | Newport Park | ppb | 73.8 | 11 PM | 80.8 | 09 PM |
| Forest | Potawatomi | ppb | 62.2 | 07 AM | 64.3 | 03 AM |
| Racine | Racine-Payne & Dolan | ppb | 77 | 09 PM | 83.2 | 03 PM |
| Sheboygan | Sheboygan-Haven | ppb | 70.4 | 05 PM | 76.9 | 01 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 73.1 | 10 PM | 75.6 | 09 PM |
| Vilas | Trout Lake | ppb | 50.7 | 02 PM | 56.5 | 09 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 72 | 11 PM | 79.7 | 05 PM |