Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 50 | 07 PM | 53.1 | 04 PM |
| Ashland | Bad River Tribal School | ppb | 48.4 | 10 PM | 49.2 | 04 PM |
| Milwaukee | Bayside | ppb | 63.3 | 08 PM | 72.2 | 05 PM |
| Rock | Beloit-Converse | ppb | 51.6 | 05 PM | 53.8 | 11 AM |
| Kenosha | Chiwaukee Prairie | ppb | 64.1 | 08 PM | 74.4 | 04 PM |
| Columbia | Columbus | ppb | 51.4 | 05 PM | 54.3 | 03 PM |
| Sauk | Devils Lake | ppb | 51.1 | 10 PM | 53.6 | 08 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 53.6 | 07 PM | 57.3 | 04 PM |
| Walworth | Elkhorn | ppb | 47.1 | 05 PM | 49.1 | 03 PM |
| Fond du Lac | Fond Du Lac | ppb | 51.4 | 06 PM | 57.6 | 04 PM |
| Ozaukee | Grafton | ppb | 65.6 | 08 PM | 74.8 | 05 PM |
| Brown | Green Bay UW | ppb | 50.5 | 05 PM | 53.2 | 11 AM |
| Ozaukee | Harrington Beach Park | ppb | 63.8 | 09 PM | 74.4 | 06 PM |
| Dodge | Horicon Wildlife Area | ppb | 55.9 | 06 PM | 59.4 | 03 PM |
| Jefferson | Jefferson-Laatsch | ppb | 53.3 | 05 PM | 57.5 | 02 PM |
| Kenosha | Kenosha-Water Tower | ppb | 62.4 | 08 PM | 74 | 04 PM |
| Kewaunee | Kewaunee | ppb | 54.9 | 10 PM | 60.9 | 08 PM |
| La Crosse | La Crosse DOT | ppb | 50.3 | 06 PM | 53.4 | 03 PM |
| Marathon | Lake Dubay | ppb | 49 | 06 PM | 51.8 | 03 PM |
| Dane | Madison East | ppb | 50.8 | 05 PM | 52.6 | 04 PM |
| Manitowoc | Manitowoc | ppb | 55.7 | 09 PM | 62.3 | 08 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 55.7 | 08 PM | 64.6 | 05 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 62.1 | 08 PM | 71 | 05 PM |
| Door | Newport Park | ppb | 54 | 11 PM | 62.6 | 09 PM |
| Forest | Potawatomi | ppb | 46.6 | 08 PM | 49 | 03 PM |
| Racine | Racine-Payne & Dolan | ppb | 64.8 | 08 PM | 75.1 | 04 PM |
| Sheboygan | Sheboygan-Haven | ppb | 59.7 | 08 PM | 65.9 | 06 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 66.1 | 09 PM | 74.1 | 07 PM |
| Vilas | Trout Lake | ppb | 49.4 | 09 PM | 50.3 | 04 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 49 | 05 PM | 51 | 03 PM |