Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 31.7 | 07 PM | 36.4 | 04 PM |
| Ashland | Bad River Tribal School | ppb | 29.6 | 08 PM | 31 | 05 PM |
| Milwaukee | Bayside | ppb | 45.6 | 09 PM | 46.8 | 04 PM |
| Rock | Beloit-Converse | ppb | 57.2 | 06 PM | 60 | 01 PM |
| Kenosha | Chiwaukee Prairie | ppb | 47.7 | 10 PM | 49.7 | 08 PM |
| Columbia | Columbus | ppb | 50.6 | 12 AM | 51.6 | 03 PM |
| Sauk | Devils Lake | ppb | 54.5 | 12 AM | 52.9 | 03 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 22.3 | 06 PM | 24.1 | 02 PM |
| Walworth | Elkhorn | ppb | 62.8 | 06 PM | 65.9 | 02 PM |
| Fond du Lac | Fond Du Lac | ppb | 45.3 | 07 PM | 48 | 05 PM |
| Ozaukee | Grafton | ppb | 44.4 | 07 PM | 46.6 | 06 PM |
| Brown | Green Bay UW | ppb | 28.9 | 10 PM | 34.7 | 04 PM |
| Ozaukee | Harrington Beach Park | ppb | 44.4 | 08 PM | 47.8 | 04 PM |
| Dodge | Horicon Wildlife Area | ppb | 52.9 | 09 PM | 56.6 | 05 PM |
| Jefferson | Jefferson-Laatsch | ppb | 55 | 06 PM | 58.5 | 04 PM |
| Kenosha | Kenosha-Water Tower | ppb | 49.8 | 09 PM | 53.8 | 05 PM |
| Kewaunee | Kewaunee | ppb | 37.8 | 09 PM | 40.7 | 06 PM |
| La Crosse | La Crosse DOT | ppb | 34.5 | 09 PM | 38.5 | 06 PM |
| Marathon | Lake Dubay | ppb | 30.8 | 08 PM | 33.3 | 01 PM |
| Dane | Madison East | ppb | 54 | 12 AM | 56.2 | 04 PM |
| Manitowoc | Manitowoc | ppb | 37.4 | 06 PM | 40 | 01 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 37.6 | 08 PM | 40.2 | 04 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 45 | 09 PM | 46 | 04 PM |
| Door | Newport Park | ppb | 29.5 | 05 PM | 31.8 | 03 PM |
| Forest | Potawatomi | ppb | 25 | 06 PM | 28.4 | 01 PM |
| Racine | Racine-Payne & Dolan | ppb | 44.3 | 09 PM | 46.9 | 06 PM |
| Sheboygan | Sheboygan-Haven | ppb | 43.3 | 06 PM | 46.5 | 05 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 42.7 | 08 PM | 47.1 | 04 PM |
| Vilas | Trout Lake | ppb | 29.6 | 05 PM | 31 | 03 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 55.5 | 06 PM | 60.1 | 03 PM |