Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 7.8 | 03 AM | 20.5 | 03 AM |
| Ashland | Bad River Tribal School | µg/m³ | 5.3 | 03 AM | 15.2 | 03 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 6.3 | 12 AM | 4.7 | 03 AM |
| Sauk | Devils Lake | µg/m³ | 16.5 | 12 AM | 13.6 | 12 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 9.6 | 03 AM | 17.7 | 03 AM |
| Brown | Green Bay East High | µg/m³ | ||||
| Ozaukee | Harrington Beach Park | µg/m³ | 11.8 | 03 AM | 13.3 | 03 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 13 | 03 AM | 11.8 | 12 AM |
| La Crosse | La Crosse DOT | µg/m³ | 14.7 | 02 AM | 14.2 | 01 AM |
| Dane | Madison East | µg/m³ | ||||
| Dane | Madison University Ave. Well #6 | µg/m³ | 21.8 | 12 AM | 11 | 12 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 15.6 | 12 AM | 15.9 | 03 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 15.5 | 12 AM | 14.8 | 03 AM |
| Taylor | Perkinstown | µg/m³ | 8.5 | 03 AM | 15.3 | 01 AM |
| Forest | Potawatomi | µg/m³ | 5.8 | 03 AM | 13 | 03 AM |
| Grant | Potosi | µg/m³ | 19 | 03 AM | 13.9 | 12 AM |
| Vilas | Trout Lake | µg/m³ | 6 | 03 AM | 12.6 | 03 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 17.4 | 12 AM | 13.3 | 03 AM |