Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 13.1 | 10 PM | 17.2 | 09 PM |
| Ashland | Bad River Tribal School | µg/m³ | 5.8 | 11 PM | 17.4 | 11 PM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 13.9 | 03 PM | 19 | 04 AM |
| Sauk | Devils Lake | µg/m³ | 14.5 | 11 PM | 18.7 | 10 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 16.1 | 11 PM | 21.7 | 01 PM |
| Brown | Green Bay East High | µg/m³ | 10.4 | 10 AM | 16.1 | 11 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 13.8 | 07 PM | 16.6 | 11 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 14.5 | 09 PM | 27.1 | 07 AM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 16 | 05 PM | 21.1 | 12 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 14.5 | 11 PM | 19.5 | 09 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 20.4 | 04 PM | 25.1 | 12 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 16 | 03 PM | 21.7 | 06 AM |
| Forest | Potawatomi | µg/m³ | 6.9 | 11 PM | 16.8 | 11 PM |
| Grant | Potosi | µg/m³ | 13.5 | 09 PM | 16.1 | 08 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 23.8 | 04 PM | 38.3 | 07 AM |