Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 22.8 | 12 AM | 18.5 | 01 AM |
| Ashland | Bad River Tribal School | µg/m³ | 11.4 | 02 AM | 7 | 03 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 19.5 | 12 AM | 19.4 | 12 AM |
| Sauk | Devils Lake | µg/m³ | 16.6 | 12 AM | 17.8 | 03 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 19.9 | 12 AM | 9.3 | 08 PM |
| Brown | Green Bay East High | µg/m³ | 22.1 | 12 AM | 19 | 12 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 17.3 | 12 AM | 16.4 | 02 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 20.1 | 12 AM | 16.9 | 03 AM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 19.8 | 12 AM | 16.6 | 03 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 23.8 | 12 AM | 16.3 | 01 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 26.8 | 12 AM | 25 | 12 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 22.2 | 12 AM | 21.2 | 12 AM |
| Forest | Potawatomi | µg/m³ | 17.5 | 12 AM | 12.1 | 12 AM |
| Grant | Potosi | µg/m³ | 17.7 | 12 AM | 18 | 02 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 23 | 12 AM | 18 | 12 AM |