Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 51.8 | 11 PM | 57.5 | 08 PM |
| Ashland | Bad River Tribal School | ppb | 40.1 | 04 PM | 43.3 | 11 AM |
| Milwaukee | Bayside | ppb | 70.4 | 07 PM | 80 | 02 PM |
| Rock | Beloit-Converse | ppb | 53.6 | 06 PM | 59.7 | 03 PM |
| Kenosha | Chiwaukee Prairie | ppb | 68.1 | 05 PM | 74.5 | 03 PM |
| Columbia | Columbus | ppb | 49.7 | 06 PM | 53.3 | 04 PM |
| Sauk | Devils Lake | ppb | 50.6 | 12 AM | 47.6 | 12 AM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 39.1 | 03 PM | 42.3 | 02 PM |
| Walworth | Elkhorn | ppb | 51.3 | 08 PM | 52.3 | 03 PM |
| Fond du Lac | Fond Du Lac | ppb | 50.7 | 08 PM | 57.5 | 06 PM |
| Ozaukee | Grafton | ppb | 70.7 | 06 PM | 83.9 | 02 PM |
| Brown | Green Bay UW | ppb | 56.4 | 10 PM | 64.3 | 08 PM |
| Ozaukee | Harrington Beach Park | ppb | 71.6 | 07 PM | 84 | 03 PM |
| Dodge | Horicon Wildlife Area | ppb | 53 | 12 AM | 50.3 | 04 PM |
| Jefferson | Jefferson-Laatsch | ppb | 52.5 | 12 AM | 52.4 | 04 PM |
| Kenosha | Kenosha-Water Tower | ppb | 60 | 06 PM | 64.5 | 04 PM |
| Kewaunee | Kewaunee | ppb | 67.6 | 11 PM | 73.8 | 08 PM |
| La Crosse | La Crosse DOT | ppb | 42.9 | 12 AM | 44.4 | 04 PM |
| Marathon | Lake Dubay | ppb | 46 | 02 AM | 46.8 | 02 AM |
| Dane | Madison East | ppb | 53.2 | 12 AM | 51.2 | 05 PM |
| Manitowoc | Manitowoc | ppb | 66 | 10 PM | 69.2 | 05 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 54.4 | 06 PM | 63.7 | 02 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 62.9 | 06 PM | 74.3 | 01 PM |
| Door | Newport Park | ppb | 57.2 | 09 PM | 64.6 | 03 PM |
| Forest | Potawatomi | ppb | 52 | 10 AM | 60.4 | 04 AM |
| Racine | Racine-Payne & Dolan | ppb | 70.2 | 06 PM | 78.3 | 12 PM |
| Sheboygan | Sheboygan-Haven | ppb | 64.6 | 09 PM | 76 | 04 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 74.5 | 08 PM | 86.6 | 04 PM |
| Vilas | Trout Lake | ppb | 46.2 | 03 PM | 47.2 | 09 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 54.7 | 12 AM | 55.6 | 03 PM |