Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 51.6 | 12 PM | 59.2 | 11 AM |
| Ashland | Bad River Tribal School | ppb | 36.6 | 03 PM | 41.6 | 09 AM |
| Milwaukee | Bayside | ppb | 62.1 | 04 PM | 81 | 01 PM |
| Rock | Beloit-Converse | ppb | 51.4 | 02 PM | 57.3 | 11 AM |
| Kenosha | Chiwaukee Prairie | ppb | 64.9 | 04 PM | 79.8 | 12 PM |
| Columbia | Columbus | ppb | 45.5 | 04 PM | 49.5 | 09 AM |
| Sauk | Devils Lake | ppb | 52.4 | 04 AM | 56.2 | 12 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | ||||
| Walworth | Elkhorn | ppb | 54.6 | 02 PM | 58.6 | 11 AM |
| Fond du Lac | Fond Du Lac | ppb | 49.3 | 04 PM | 56.7 | 10 AM |
| Ozaukee | Grafton | ppb | 60.2 | 04 PM | 80 | 01 PM |
| Brown | Green Bay UW | ppb | 50.3 | 09 PM | 60.8 | 07 PM |
| Ozaukee | Harrington Beach Park | ppb | 67.2 | 05 PM | 77.3 | 01 PM |
| Dodge | Horicon Wildlife Area | ppb | 51 | 12 AM | 52.8 | 10 AM |
| Jefferson | Jefferson-Laatsch | ppb | 47.8 | 12 AM | 53.5 | 11 AM |
| Kenosha | Kenosha-Water Tower | ppb | 58.4 | 03 PM | 64.6 | 10 AM |
| Kewaunee | Kewaunee | ppb | 67.9 | 09 PM | 77.5 | 06 PM |
| La Crosse | La Crosse DOT | ppb | 44.2 | 12 AM | 43.3 | 05 AM |
| Marathon | Lake Dubay | ppb | 37.9 | 04 PM | 42.4 | 10 AM |
| Dane | Madison East | ppb | 51 | 12 AM | 47.6 | 09 AM |
| Manitowoc | Manitowoc | ppb | 67.9 | 08 PM | 75.5 | 04 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 52.8 | 03 PM | 58 | 12 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 60 | 04 PM | 77.9 | 01 PM |
| Door | Newport Park | ppb | 61.7 | 10 PM | 68.2 | 09 PM |
| Forest | Potawatomi | ppb | 38.1 | 12 AM | 40.3 | 10 AM |
| Racine | Racine-Payne & Dolan | ppb | 66.1 | 05 PM | 80.8 | 12 PM |
| Sheboygan | Sheboygan-Haven | ppb | 65.3 | 05 PM | 72.8 | 02 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 68.6 | 06 PM | 76.6 | 03 PM |
| Vilas | Trout Lake | ppb | 40.1 | 05 PM | 45.6 | 11 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 52.2 | 12 AM | 57.6 | 12 PM |