Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 16.8 | 02 AM | 62.3 | 02 AM |
| Ashland | Bad River Tribal School | µg/m³ | 21.4 | 03 AM | 92.4 | 01 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 16.8 | 04 AM | 123.6 | 03 AM |
| Sauk | Devils Lake | µg/m³ | 15 | 09 AM | 92.1 | 12 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 26.5 | 12 AM | 88.5 | 12 AM |
| Brown | Green Bay East High | µg/m³ | 16.3 | 03 AM | 73 | 02 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 13.9 | 03 AM | 53.4 | 02 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 15.9 | 02 AM | 78.3 | 01 AM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 13.9 | 01 AM | 70.1 | 12 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 15.1 | 01 AM | 77.5 | 12 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 16.3 | 03 AM | 78.8 | 02 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 17 | 03 AM | 87.2 | 02 AM |
| Forest | Potawatomi | µg/m³ | 12.5 | 08 AM | 79.6 | 02 AM |
| Grant | Potosi | µg/m³ | 15.7 | 10 AM | 23.4 | 12 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 16 | 03 AM | 98.9 | 02 AM |