Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 29 | 12 AM | 23 | 12 AM |
| Ashland | Bad River Tribal School | µg/m³ | 29.5 | 03 AM | 31.8 | 02 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 33.8 | 12 PM | 39 | 01 AM |
| Sauk | Devils Lake | µg/m³ | 22.5 | 12 AM | 15.8 | 03 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 27.5 | 12 AM | 25.8 | 02 AM |
| Brown | Green Bay East High | µg/m³ | 33.4 | 12 AM | 22.5 | 12 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 26.8 | 12 AM | 21.5 | 03 PM |
| Jackson | Ho-Chunk Nation-Black River Falls | µg/m³ | 26.8 | 12 AM | 26.8 | 02 AM |
| Monroe | Ho-Chunk Nation-Tomah | µg/m³ | 25.1 | 01 AM | 25.6 | 12 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 21.7 | 12 AM | 18.6 | 05 AM |
| Marathon | Lake Dubay | µg/m³ | 26.1 | 12 AM | 26.7 | 03 AM |
| Dane | Madison East | µg/m³ | 15.7 | 12 AM | 17.7 | 08 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 16.9 | 12 AM | 19.6 | 08 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 23.5 | 12 AM | 23.9 | 02 PM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 22.3 | 12 AM | 19.9 | 02 PM |
| Forest | Potawatomi | µg/m³ | 28 | 12 AM | 28.7 | 05 AM |
| Grant | Potosi | µg/m³ | 22.2 | 06 AM | 22.1 | 12 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 23.6 | 12 AM | 20.3 | 12 AM |