Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 63.3 | 09 PM | 68.7 | 08 PM |
| Ashland | Bad River Tribal School | ppb | 28.5 | 06 PM | 35.8 | 11 PM |
| Milwaukee | Bayside | ppb | 75.6 | 08 PM | 79.2 | 06 PM |
| Rock | Beloit-Converse | ppb | 63.7 | 06 PM | 70.7 | 02 PM |
| Kenosha | Chiwaukee Prairie | ppb | 79.3 | 08 PM | 82.7 | 05 PM |
| Columbia | Columbus | ppb | 52.6 | 07 PM | 63.5 | 03 PM |
| Sauk | Devils Lake | ppb | 47.4 | 04 PM | 50 | 03 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 43.6 | 06 PM | 48.5 | 04 PM |
| Walworth | Elkhorn | ppb | 74.1 | 06 PM | 83.6 | 04 PM |
| Fond du Lac | Fond Du Lac | ppb | 61.9 | 08 PM | 68 | 05 PM |
| Ozaukee | Grafton | ppb | 73.4 | 08 PM | 76.3 | 05 PM |
| Brown | Green Bay UW | ppb | 60.5 | 05 PM | 64.9 | 11 AM |
| Ozaukee | Harrington Beach Park | ppb | 71.6 | 11 PM | 73.9 | 05 PM |
| Dodge | Horicon Wildlife Area | ppb | 69 | 09 PM | 77 | 06 PM |
| Jefferson | Jefferson-Laatsch | ppb | 66.4 | 07 PM | 72.4 | 03 PM |
| Kenosha | Kenosha-Water Tower | ppb | 77.4 | 07 PM | 79.6 | 06 PM |
| Kewaunee | Kewaunee | ppb | 65.8 | 11 PM | 69.6 | 08 PM |
| La Crosse | La Crosse DOT | ppb | 41.1 | 05 PM | 42.6 | 12 PM |
| Marathon | Lake Dubay | ppb | 50 | 05 PM | 56.7 | 03 PM |
| Dane | Madison East | ppb | 53.6 | 06 PM | 61.9 | 02 PM |
| Manitowoc | Manitowoc | ppb | 61.1 | 11 PM | 64.6 | 07 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 55.1 | 09 PM | 60.2 | 06 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 72.5 | 08 PM | 75 | 05 PM |
| Door | Newport Park | ppb | 60.9 | 10 PM | 63.9 | 07 PM |
| Forest | Potawatomi | ppb | 47.5 | 09 PM | 53.3 | 07 PM |
| Racine | Racine-Payne & Dolan | ppb | 78.2 | 08 PM | 81.3 | 04 PM |
| Sheboygan | Sheboygan-Haven | ppb | 71 | 08 PM | 76.1 | 05 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 68.3 | 11 PM | 72.1 | 11 PM |
| Vilas | Trout Lake | ppb | 45.7 | 10 PM | 48.7 | 05 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 70.4 | 08 PM | 84.4 | 04 PM |