Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 16.6 | 08 AM | 23.6 | 01 AM |
| Ashland | Bad River Tribal School | µg/m³ | 8 | 04 PM | 10.8 | 11 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 18.8 | 06 AM | 18.9 | 05 AM |
| Sauk | Devils Lake | µg/m³ | 11.8 | 04 AM | 15.1 | 01 PM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 16.6 | 12 AM | 19 | 11 AM |
| Brown | Green Bay East High | µg/m³ | 14.8 | 11 PM | 29.5 | 11 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 17.3 | 08 AM | 23 | 02 PM |
| Dodge | Horicon Wildlife Area | µg/m³ | 14.2 | 07 AM | 18.3 | 12 AM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 12.6 | 05 AM | 15.8 | 01 PM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 13.9 | 07 AM | 21.4 | 12 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 19 | 07 AM | 23.1 | 02 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 16.4 | 06 AM | 20.4 | 03 AM |
| Forest | Potawatomi | µg/m³ | 13.4 | 01 AM | 16.6 | 05 AM |
| Grant | Potosi | µg/m³ | 13.1 | 12 AM | 17 | 01 PM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 16.6 | 05 AM | 22.6 | 04 AM |