Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 18.2 | 12 AM | 15.1 | 12 AM |
| Ashland | Bad River Tribal School | µg/m³ | 12.2 | 12 PM | 16.6 | 12 PM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 19.1 | 08 AM | 22 | 03 PM |
| Sauk | Devils Lake | µg/m³ | 12.1 | 12 AM | 25 | 11 PM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 15.3 | 12 AM | 12.4 | 10 PM |
| Brown | Green Bay East High | µg/m³ | 18.6 | 12 AM | 28.5 | 11 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 22.6 | 12 AM | 24.5 | 02 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 14.9 | 12 AM | 15.5 | 11 PM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 12.4 | 12 AM | 15.9 | 11 PM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 13.3 | 12 AM | 16.6 | 11 PM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 20.3 | 12 AM | 43 | 09 PM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 18.7 | 12 AM | 24.8 | 09 PM |
| Forest | Potawatomi | µg/m³ | 16.3 | 12 AM | 12.6 | 12 AM |
| Grant | Potosi | µg/m³ | 12.6 | 11 PM | 18.8 | 06 PM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 16.9 | 12 AM | 21.3 | 11 PM |