Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 6.2 | 12 AM | 7.3 | 04 AM |
| Ashland | Bad River Tribal School | µg/m³ | 16 | 08 AM | 17 | 12 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 6.2 | 08 AM | 9.9 | 04 AM |
| Sauk | Devils Lake | µg/m³ | 5.9 | 06 AM | 6 | 12 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 14.2 | 08 AM | 15.2 | 12 AM |
| Brown | Green Bay East High | µg/m³ | 6.7 | 08 AM | 9.1 | 05 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 5.4 | 07 AM | 7.5 | 04 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 6.5 | 08 AM | 8.8 | 07 AM |
| Marathon | Lake Dubay | µg/m³ | 6.7 | 06 AM | 7.1 | 08 AM |
| Dane | Madison East | µg/m³ | 5.7 | 07 AM | 6.8 | 04 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 8.1 | 08 AM | 8.4 | 12 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 9.4 | 08 AM | 14.2 | 12 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 7.5 | 08 AM | 11.1 | 02 AM |
| Forest | Potawatomi | µg/m³ | 5.6 | 08 AM | 8.7 | 08 AM |
| Grant | Potosi | µg/m³ | 10 | 12 AM | 7.4 | 08 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 9.3 | 08 AM | 16.3 | 04 AM |