Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 24.2 | 12 AM | 21 | 04 AM |
| Ashland | Bad River Tribal School | ppb | 30.9 | 05 PM | 32.1 | 11 AM |
| Milwaukee | Bayside | ppb | 44.5 | 04 PM | 50.2 | 11 AM |
| Rock | Beloit-Converse | ppb | 51.4 | 04 PM | 66.1 | 01 PM |
| Kenosha | Chiwaukee Prairie | ppb | 52.1 | 04 PM | 60 | 04 PM |
| Columbia | Columbus | ppb | 42.6 | 12 AM | 37.4 | 11 AM |
| Sauk | Devils Lake | ppb | 34.9 | 06 PM | 37.9 | 01 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 35.4 | 06 PM | 38.3 | 04 PM |
| Walworth | Elkhorn | ppb | 52.8 | 04 PM | 65 | 10 AM |
| Fond du Lac | Fond Du Lac | ppb | 33.5 | 05 PM | 35.8 | 01 PM |
| Ozaukee | Grafton | ppb | 41.9 | 03 PM | 47 | 10 AM |
| Brown | Green Bay UW | ppb | 35.4 | 05 PM | 39.4 | 03 PM |
| Ozaukee | Harrington Beach Park | ppb | 43.3 | 12 AM | 41.4 | 01 PM |
| Dodge | Horicon Wildlife Area | ppb | 35.5 | 05 PM | 36.9 | 03 PM |
| Jefferson | Jefferson-Laatsch | ppb | 41.2 | 04 PM | 47.2 | 10 AM |
| Kenosha | Kenosha-Water Tower | ppb | 52.9 | 04 PM | 54.7 | 10 AM |
| Kewaunee | Kewaunee | ppb | 38.5 | 08 AM | 40.2 | 02 AM |
| La Crosse | La Crosse DOT | ppb | 36.8 | 07 PM | 39.7 | 01 PM |
| Marathon | Lake Dubay | ppb | 32.1 | 05 PM | 35.3 | 01 PM |
| Dane | Madison East | ppb | 38.3 | 04 PM | 42.3 | 10 AM |
| Manitowoc | Manitowoc | ppb | 36.6 | 04 PM | 38.2 | 04 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 43.9 | 12 AM | 47.3 | 12 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 46.3 | 04 PM | 52.9 | 11 AM |
| Door | Newport Park | ppb | 32.1 | 04 PM | 33.2 | 11 AM |
| Forest | Potawatomi | ppb | 36.4 | 05 PM | 39.6 | 11 AM |
| Racine | Racine-Payne & Dolan | ppb | 48 | 05 PM | 58.6 | 01 PM |
| Sheboygan | Sheboygan-Haven | ppb | 36.9 | 04 PM | 40.5 | 11 AM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 39 | 07 PM | 42.4 | 12 PM |
| Vilas | Trout Lake | ppb | 36.9 | 05 PM | 38.5 | 01 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 43.1 | 12 AM | 46.4 | 12 PM |