Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 49.5 | 05 PM | 53.8 | 01 PM |
| Ashland | Bad River Tribal School | ppb | 39 | 02 AM | 40.4 | 01 AM |
| Milwaukee | Bayside | ppb | 62.8 | 07 PM | 67.1 | 03 PM |
| Rock | Beloit-Converse | ppb | 55.1 | 05 PM | 57.7 | 01 PM |
| Kenosha | Chiwaukee Prairie | ppb | 65.9 | 08 PM | 70.6 | 05 PM |
| Columbia | Columbus | ppb | 52.9 | 05 PM | 56.1 | 01 PM |
| Sauk | Devils Lake | ppb | 48.9 | 04 PM | 52.5 | 02 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 47.1 | 12 AM | 46.2 | 12 AM |
| Walworth | Elkhorn | ppb | 56.7 | 05 PM | 61.6 | 03 PM |
| Fond du Lac | Fond Du Lac | ppb | 50.7 | 05 PM | 53.8 | 02 PM |
| Ozaukee | Grafton | ppb | 65.9 | 07 PM | 70.4 | 04 PM |
| Brown | Green Bay UW | ppb | 56.9 | 09 PM | 60.9 | 08 PM |
| Ozaukee | Harrington Beach Park | ppb | 68 | 08 PM | 71.5 | 04 PM |
| Dodge | Horicon Wildlife Area | ppb | 53.4 | 05 PM | 56.5 | 02 PM |
| Jefferson | Jefferson-Laatsch | ppb | 52.7 | 05 PM | 56 | 02 PM |
| Kenosha | Kenosha-Water Tower | ppb | 62.6 | 08 PM | 66.9 | 03 PM |
| Kewaunee | Kewaunee | ppb | 62.5 | 09 PM | 65.6 | 07 PM |
| La Crosse | La Crosse DOT | ppb | 47.3 | 12 AM | 43.1 | 12 AM |
| Marathon | Lake Dubay | ppb | 41.7 | 04 PM | 44.4 | 02 PM |
| Dane | Madison East | ppb | 52.4 | 05 PM | 53.8 | 01 PM |
| Manitowoc | Manitowoc | ppb | 63.3 | 08 PM | 66.1 | 06 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 55.8 | 06 PM | 59.9 | 03 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 62.8 | 08 PM | 65.6 | 03 PM |
| Door | Newport Park | ppb | 67.1 | 09 PM | 70.5 | 05 PM |
| Forest | Potawatomi | ppb | 40.7 | 03 PM | 44.7 | 12 PM |
| Racine | Racine-Payne & Dolan | ppb | 56 | 08 PM | 58.1 | 05 PM |
| Sheboygan | Sheboygan-Haven | ppb | 63.8 | 08 PM | 66.5 | 05 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 68.1 | 08 PM | 72.2 | 05 PM |
| Vilas | Trout Lake | ppb | 43.3 | 05 AM | 44.9 | 12 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 60.1 | 08 PM | 61.2 | 03 PM |