Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 11.2 | 07 AM | 13.3 | 01 AM |
| Ashland | Bad River Tribal School | µg/m³ | 8.4 | 11 AM | 9.6 | 10 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 8.3 | 12 AM | 7 | 09 PM |
| Sauk | Devils Lake | µg/m³ | 9.5 | 05 AM | 10.5 | 12 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 11 | 10 AM | 12.9 | 05 AM |
| Brown | Green Bay East High | µg/m³ | 10.8 | 12 AM | 10.4 | 06 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 8 | 12 AM | 7.4 | 12 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 9.1 | 01 AM | 9.8 | 12 AM |
| Marathon | Lake Dubay | µg/m³ | 8.7 | 07 AM | 9.6 | 02 AM |
| Dane | Madison East | µg/m³ | 8.6 | 03 AM | 9.7 | 02 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 16.3 | 01 PM | 20.7 | 07 PM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 11 | 12 AM | 10.8 | 11 PM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 9.3 | 12 AM | 8.7 | 10 PM |
| Forest | Potawatomi | µg/m³ | 8.4 | 09 AM | 9.4 | 09 AM |
| Grant | Potosi | µg/m³ | 11.2 | 07 AM | 13.1 | 06 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 12.5 | 07 AM | 20.9 | 06 AM |