Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 15.4 | 12 AM | 17.9 | 05 AM |
| Ashland | Bad River Tribal School | µg/m³ | 23.3 | 05 AM | 28 | 12 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 13.9 | 12 AM | 19.4 | 12 AM |
| Sauk | Devils Lake | µg/m³ | 15.5 | 03 AM | 21.3 | 02 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 17.7 | 05 AM | 19.6 | 03 AM |
| Brown | Green Bay East High | µg/m³ | 13.9 | 05 AM | 17.7 | 12 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 11.8 | 02 AM | 14.4 | 12 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 14 | 12 AM | 14.7 | 05 AM |
| La Crosse | La Crosse DOT | µg/m³ | 12.6 | 12 AM | 10.1 | 12 AM |
| Dane | Madison East | µg/m³ | 13.4 | 12 AM | 12.8 | 05 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 15.1 | 12 AM | 14 | 05 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 16.4 | 12 AM | 21.1 | 12 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 15.4 | 12 AM | 19.9 | 12 AM |
| Taylor | Perkinstown | µg/m³ | 16.6 | 12 AM | 16.9 | 05 AM |
| Forest | Potawatomi | µg/m³ | 20.8 | 05 AM | 28.8 | 12 AM |
| Grant | Potosi | µg/m³ | 17.2 | 02 AM | 16.5 | 12 AM |
| Vilas | Trout Lake | µg/m³ | 21.8 | 05 AM | 29.1 | 12 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 19.1 | 12 AM | 21.5 | 12 AM |