Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 9.3 | 11 PM | 14 | 11 PM |
| Ashland | Bad River Tribal School | µg/m³ | 4.9 | 11 PM | 6.3 | 10 PM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 7 | 09 PM | 9.9 | 07 PM |
| Sauk | Devils Lake | µg/m³ | 7.1 | 08 PM | 9.5 | 07 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 6.7 | 11 PM | 11 | 09 PM |
| Brown | Green Bay East High | µg/m³ | 7.5 | 11 PM | 10.1 | 11 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 6.7 | 11 PM | 12 | 09 PM |
| Dodge | Horicon Wildlife Area | µg/m³ | 9.7 | 08 PM | 13.2 | 08 PM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 8.9 | 06 PM | ||
| Dane | Madison University Ave. Well #6 | µg/m³ | 7.2 | 07 PM | 9.4 | 07 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 8.8 | 10 PM | 13.6 | 09 PM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 8.1 | 09 PM | 11.6 | 09 PM |
| Forest | Potawatomi | µg/m³ | ||||
| Grant | Potosi | µg/m³ | 6.8 | 06 PM | 8.5 | 01 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 9.9 | 09 PM | 14.6 | 08 PM |