Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 9.4 | 12 AM | 10.4 | 11 PM |
| Ashland | Bad River Tribal School | µg/m³ | 5.6 | 12 AM | 4.4 | 12 PM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 15 | 12 AM | 10.6 | 08 AM |
| Sauk | Devils Lake | µg/m³ | 10.5 | 12 AM | 15.9 | 07 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 9.2 | 12 AM | 11.7 | 12 AM |
| Brown | Green Bay East High | µg/m³ | 7.8 | 12 AM | 11.7 | 11 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 10.2 | 12 AM | 8.8 | 02 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 11.3 | 12 AM | 14 | 07 AM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 10.2 | 12 AM | 10.3 | 03 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 13.4 | 12 AM | 11.2 | 12 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 16.6 | 12 AM | 13.7 | 06 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 13 | 12 AM | 12.5 | 11 PM |
| Forest | Potawatomi | µg/m³ | 6.5 | 12 AM | 4.4 | 02 AM |
| Grant | Potosi | µg/m³ | 9.5 | 12 AM | 5.5 | 11 PM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 12.9 | 12 AM | 14.4 | 04 AM |