Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 58.8 | 08 PM | 63 | 04 PM |
| Ashland | Bad River Tribal School | ppb | 50.3 | 11 PM | 51.4 | 09 PM |
| Milwaukee | Bayside | ppb | 60.9 | 08 PM | 62.8 | 06 PM |
| Rock | Beloit-Converse | ppb | 58.5 | 06 PM | 63.3 | 03 PM |
| Kenosha | Chiwaukee Prairie | ppb | 63.4 | 08 PM | 69 | 05 PM |
| Columbia | Columbus | ppb | 55.3 | 06 PM | 58.7 | 04 PM |
| Sauk | Devils Lake | ppb | 52.2 | 07 PM | 54.5 | 02 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 51.4 | 09 PM | 52 | 08 PM |
| Walworth | Elkhorn | ppb | 63.3 | 06 PM | 69.1 | 04 PM |
| Fond du Lac | Fond Du Lac | ppb | 58.7 | 06 PM | 63.3 | 04 PM |
| Ozaukee | Grafton | ppb | 60.7 | 08 PM | 64 | 02 PM |
| Brown | Green Bay UW | ppb | 53.6 | 09 PM | 56.9 | 02 PM |
| Ozaukee | Harrington Beach Park | ppb | 60.8 | 09 PM | 65.5 | 03 PM |
| Dodge | Horicon Wildlife Area | ppb | 60.4 | 07 PM | 63.1 | 03 PM |
| Jefferson | Jefferson-Laatsch | ppb | 56.9 | 08 PM | 59.1 | 04 PM |
| Kenosha | Kenosha-Water Tower | ppb | 59.3 | 08 PM | 65.2 | 05 PM |
| Kewaunee | Kewaunee | ppb | 55.3 | 11 PM | 58.4 | 08 PM |
| La Crosse | La Crosse DOT | ppb | 52.1 | 07 PM | 55.6 | 06 PM |
| Marathon | Lake Dubay | ppb | 49.9 | 07 PM | 51.9 | 03 PM |
| Dane | Madison East | ppb | 53.4 | 07 PM | 56.5 | 04 PM |
| Manitowoc | Manitowoc | ppb | 55.3 | 10 PM | 58.8 | 04 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 47.9 | 06 PM | 53.6 | 02 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 61.5 | 08 PM | 64 | 03 PM |
| Door | Newport Park | ppb | 51.6 | 11 PM | 56.8 | 11 PM |
| Forest | Potawatomi | ppb | 54.9 | 10 PM | 57.2 | 06 PM |
| Racine | Racine-Payne & Dolan | ppb | 62.2 | 08 PM | 67 | 03 PM |
| Sheboygan | Sheboygan-Haven | ppb | 57.1 | 09 PM | 64.1 | 04 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 59.5 | 09 PM | 65.2 | 04 PM |
| Vilas | Trout Lake | ppb | 50.4 | 10 PM | 51.6 | 04 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 60.6 | 08 PM | 69.2 | 03 PM |