Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 15.9 | 09 PM | 34 | 08 PM |
| Ashland | Bad River Tribal School | µg/m³ | 14.4 | 10 AM | 28.6 | 06 PM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 21.9 | 11 PM | 41.1 | 10 PM |
| Sauk | Devils Lake | µg/m³ | 16.3 | 11 PM | 21.5 | 10 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 16.8 | 01 PM | 23.1 | 11 AM |
| Brown | Green Bay East High | µg/m³ | 18.2 | 11 PM | 39.6 | 09 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 17.8 | 11 PM | 30.9 | 10 PM |
| Dodge | Horicon Wildlife Area | µg/m³ | 16.9 | 11 PM | 28.6 | 10 PM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 24.9 | 11 PM | 89 | 10 PM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 21.7 | 11 PM | 44.3 | 10 PM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 29.9 | 11 PM | 85.4 | 10 PM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 26.6 | 11 PM | 51.3 | 10 PM |
| Forest | Potawatomi | µg/m³ | 12.4 | 01 PM | 15.9 | 12 PM |
| Grant | Potosi | µg/m³ | 22.7 | 11 PM | 41.6 | 12 PM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 31.4 | 11 PM | 95.7 | 10 PM |