Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 39.1 | 11 PM | 42 | 11 PM |
| Ashland | Bad River Tribal School | ppb | 22.1 | 12 AM | 21.4 | 12 AM |
| Milwaukee | Bayside | ppb | 77.6 | 09 PM | 92.4 | 06 PM |
| Rock | Beloit-Converse | ppb | 53.3 | 05 PM | 60.8 | 01 PM |
| Kenosha | Chiwaukee Prairie | ppb | 75.2 | 08 PM | 90.4 | 03 PM |
| Columbia | Columbus | ppb | 41.7 | 07 PM | 47.1 | 05 PM |
| Sauk | Devils Lake | ppb | 39.7 | 05 PM | 42.5 | 03 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 32.8 | 07 PM | 44.6 | 07 PM |
| Walworth | Elkhorn | ppb | 53 | 08 PM | 68.9 | 07 PM |
| Fond du Lac | Fond Du Lac | ppb | 50.6 | 11 PM | 62.4 | 08 PM |
| Ozaukee | Grafton | ppb | 79.9 | 10 PM | 97.1 | 06 PM |
| Brown | Green Bay UW | ppb | 39.3 | 11 PM | 48.4 | 11 PM |
| Ozaukee | Harrington Beach Park | ppb | 68.8 | 11 PM | 81.3 | 07 PM |
| Dodge | Horicon Wildlife Area | ppb | 52.9 | 11 PM | 69.4 | 09 PM |
| Jefferson | Jefferson-Laatsch | ppb | 48.7 | 07 PM | 51.7 | 02 PM |
| Kenosha | Kenosha-Water Tower | ppb | 76.3 | 08 PM | 92.9 | 04 PM |
| Kewaunee | Kewaunee | ppb | 49.8 | 11 PM | 55.4 | 07 PM |
| La Crosse | La Crosse DOT | ppb | 30.7 | 03 PM | 51 | 10 PM |
| Marathon | Lake Dubay | ppb | 36.3 | 11 PM | 44.2 | 08 PM |
| Dane | Madison East | ppb | 44.9 | 07 PM | 50 | 05 PM |
| Manitowoc | Manitowoc | ppb | 47.6 | 08 PM | 54 | 04 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 74.1 | 08 PM | 90.2 | 04 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 80.1 | 08 PM | 95.4 | 05 PM |
| Door | Newport Park | ppb | 38.6 | 11 PM | 45.3 | 08 PM |
| Forest | Potawatomi | ppb | 27 | 11 PM | 30 | 11 PM |
| Racine | Racine-Payne & Dolan | ppb | 79.3 | 08 PM | 91 | 04 PM |
| Sheboygan | Sheboygan-Haven | ppb | 48.7 | 09 PM | 56.3 | 02 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 63.6 | 10 PM | 77.3 | 09 PM |
| Vilas | Trout Lake | ppb | 22.3 | 12 AM | 23.9 | 04 AM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 69.5 | 08 PM | 89.7 | 06 PM |