Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 12.9 | 11 PM | 20 | 04 PM |
| Ashland | Bad River Tribal School | µg/m³ | 9.5 | 11 PM | 15.2 | 12 PM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 14 | 11 PM | 19.4 | 11 PM |
| Sauk | Devils Lake | µg/m³ | 16.8 | 11 PM | 24 | 03 PM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 20.2 | 11 PM | 24.6 | 04 PM |
| Brown | Green Bay East High | µg/m³ | 12.9 | 11 PM | 19.3 | 05 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 10.7 | 11 PM | 19.5 | 04 PM |
| Dodge | Horicon Wildlife Area | µg/m³ | 15.5 | 11 PM | 20.8 | 01 PM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 14.1 | 11 PM | 20.5 | 01 PM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 16.6 | 11 PM | 23 | 12 PM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 15.7 | 11 PM | 23.1 | 07 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 14.5 | 11 PM | 19.8 | 11 PM |
| Forest | Potawatomi | µg/m³ | 9.7 | 11 PM | 17.4 | 11 PM |
| Grant | Potosi | µg/m³ | 19.3 | 11 PM | 25 | 01 PM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 17.3 | 11 PM | 21.8 | 11 PM |