Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 7.4 | 12 AM | 10.3 | 04 PM |
| Ashland | Bad River Tribal School | µg/m³ | 4 | 11 PM | 6.7 | 11 PM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 14.2 | 08 PM | 19 | 03 PM |
| Sauk | Devils Lake | µg/m³ | 16.4 | 11 PM | 29 | 03 PM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 7.6 | 11 PM | 14.9 | 11 PM |
| Brown | Green Bay East High | µg/m³ | 6.9 | 12 AM | 8.3 | 06 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 11.2 | 11 PM | 19.2 | 03 PM |
| Dodge | Horicon Wildlife Area | µg/m³ | 13 | 09 PM | 23 | 07 PM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 19.9 | 06 PM | 33.3 | 06 PM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 22.4 | 06 PM | 37.7 | 05 PM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 16.1 | 07 PM | 23.5 | 07 PM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 15.8 | 07 PM | 19.8 | 04 PM |
| Forest | Potawatomi | µg/m³ | 4.6 | 12 AM | 8.2 | 10 PM |
| Grant | Potosi | µg/m³ | 18.8 | 11 PM | 41.4 | 05 PM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 18 | 07 PM | 30.5 | 06 PM |