Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 17.7 | 05 PM | 32.4 | 04 PM |
| Ashland | Bad River Tribal School | µg/m³ | 10.5 | 07 AM | 11 | 06 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 26.7 | 09 PM | 33.7 | 10 AM |
| Sauk | Devils Lake | µg/m³ | 19.4 | 04 PM | 33.7 | 02 PM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 20.2 | 12 AM | 16.8 | 12 AM |
| Brown | Green Bay East High | µg/m³ | 18 | 06 PM | 34.5 | 05 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 23 | 06 PM | 33.6 | 05 PM |
| Dodge | Horicon Wildlife Area | µg/m³ | 21.3 | 05 PM | 33.1 | 03 PM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 20.7 | 07 PM | 31.9 | 01 PM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 22.2 | 05 PM | 33.8 | 02 PM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 26.7 | 07 PM | 36.4 | 02 PM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 26.3 | 08 PM | 35.6 | 02 PM |
| Forest | Potawatomi | µg/m³ | 12.2 | 09 AM | 18 | 12 AM |
| Grant | Potosi | µg/m³ | 21.1 | 05 PM | 33.8 | 12 PM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 26.4 | 07 PM | 36.8 | 02 PM |