Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 10.4 | 05 PM | 15.2 | 09 AM |
| Ashland | Bad River Tribal School | µg/m³ | 3.7 | 06 PM | 4.3 | 02 PM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 14.6 | 11 PM | 21.1 | 09 PM |
| Sauk | Devils Lake | µg/m³ | 11.5 | 09 PM | 20.7 | 03 PM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 9.1 | 05 PM | 12.7 | 08 AM |
| Brown | Green Bay East High | µg/m³ | 11.8 | 04 PM | 20.9 | 10 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 9.2 | 10 PM | 18.2 | 10 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 13.6 | 11 PM | 22.3 | 03 PM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 15.5 | 09 PM | 23.1 | 07 PM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 16.4 | 09 PM | 22.7 | 07 PM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 16.9 | 11 PM | 22.7 | 02 PM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 17.6 | 11 PM | 23.4 | 10 PM |
| Forest | Potawatomi | µg/m³ | 4.7 | 06 PM | 10.3 | 09 AM |
| Grant | Potosi | µg/m³ | 12 | 06 PM | 16.7 | 12 PM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 15.3 | 11 PM | 20 | 07 AM |