Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 25.6 | 05 AM | 31.2 | 02 AM |
| Ashland | Bad River Tribal School | µg/m³ | 10.3 | 09 AM | 12.9 | 03 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 35.7 | 12 AM | 29.4 | 12 AM |
| Sauk | Devils Lake | µg/m³ | 22.3 | 04 AM | 21.9 | 12 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 23.1 | 09 AM | 27.2 | 06 AM |
| Brown | Green Bay East High | µg/m³ | 24.5 | 11 AM | 25.3 | 12 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 31.4 | 03 AM | 31.3 | 05 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 24.3 | 12 AM | 25.1 | 02 AM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 29.3 | 12 AM | 21.5 | 12 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 27.6 | 12 AM | 21.3 | 12 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 37.8 | 12 AM | 42.2 | 01 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 32.8 | 12 AM | 33.8 | 12 AM |
| Forest | Potawatomi | µg/m³ | 17.3 | 07 PM | 20 | 09 AM |
| Grant | Potosi | µg/m³ | 27.9 | 12 AM | 14.7 | 05 PM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 34.7 | 12 AM | 30.2 | 12 AM |