Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 64.6 | 05 PM | 70.4 | 03 PM |
| Ashland | Bad River Tribal School | ppb | 39 | 04 PM | 42.9 | 11 AM |
| Milwaukee | Bayside | ppb | 56.3 | 07 PM | 60.6 | 04 PM |
| Rock | Beloit-Converse | ppb | 62.9 | 05 PM | 70.3 | 01 PM |
| Kenosha | Chiwaukee Prairie | ppb | 69.7 | 09 PM | 75.4 | 04 PM |
| Columbia | Columbus | ppb | 62.2 | 06 PM | 65.5 | 01 PM |
| Sauk | Devils Lake | ppb | 55.7 | 04 PM | 60.1 | 01 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 46 | 04 PM | 49.7 | 12 PM |
| Walworth | Elkhorn | ppb | 68.5 | 07 PM | 71.8 | 03 PM |
| Fond du Lac | Fond Du Lac | ppb | 66.7 | 05 PM | 73.8 | 03 PM |
| Ozaukee | Grafton | ppb | 55.1 | 06 PM | 61 | 03 PM |
| Brown | Green Bay UW | ppb | 59.3 | 06 PM | 66.7 | 02 PM |
| Ozaukee | Harrington Beach Park | ppb | 52.8 | 04 PM | 57.9 | 03 PM |
| Dodge | Horicon Wildlife Area | ppb | 66.1 | 06 PM | 69.6 | 01 PM |
| Jefferson | Jefferson-Laatsch | ppb | 64 | 06 PM | 70 | 01 PM |
| Kenosha | Kenosha-Water Tower | ppb | 70.1 | 09 PM | 80 | 04 PM |
| Kewaunee | Kewaunee | ppb | 53.1 | 08 PM | 56.5 | 04 PM |
| La Crosse | La Crosse DOT | ppb | 47 | 05 PM | 51 | 03 PM |
| Marathon | Lake Dubay | ppb | 54 | 12 AM | 59 | 01 PM |
| Dane | Madison East | ppb | 58 | 05 PM | 62.8 | 02 PM |
| Manitowoc | Manitowoc | ppb | 53.8 | 08 PM | 57.8 | 03 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 50.4 | 11 PM | 58.1 | 08 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 58.4 | 06 PM | 63.6 | 05 PM |
| Door | Newport Park | ppb | 54.2 | 11 PM | 58.2 | 09 PM |
| Forest | Potawatomi | ppb | 58.1 | 01 PM | 64.3 | 11 AM |
| Racine | Racine-Payne & Dolan | ppb | 70.2 | 10 PM | 77.1 | 04 PM |
| Sheboygan | Sheboygan-Haven | ppb | 58.7 | 05 PM | 64.5 | 12 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 51.6 | 08 PM | 55 | 03 PM |
| Vilas | Trout Lake | ppb | 47.1 | 04 PM | 50.2 | 11 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 64.9 | 08 PM | 74.6 | 07 PM |