Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 14.8 | 11 PM | 24.3 | 10 PM |
| Ashland | Bad River Tribal School | µg/m³ | 11.3 | 12 AM | 10.1 | 04 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 14.4 | 08 PM | 22.4 | 09 PM |
| Sauk | Devils Lake | µg/m³ | 13.8 | 09 PM | 23.4 | 07 PM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 15.4 | 10 AM | 21.9 | 08 PM |
| Brown | Green Bay East High | µg/m³ | 14.8 | 11 PM | 27.1 | 11 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 13 | 11 PM | 28.3 | 11 PM |
| Dodge | Horicon Wildlife Area | µg/m³ | 13.9 | 11 PM | 27 | 09 PM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 26.4 | 11 PM | 97.4 | 08 PM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 16.1 | 11 PM | 27 | 08 PM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 20.3 | 11 PM | 46 | 08 PM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 16.6 | 11 PM | 39 | 10 PM |
| Forest | Potawatomi | µg/m³ | 11.6 | 12 AM | 7.5 | 05 AM |
| Grant | Potosi | µg/m³ | 14.8 | 11 PM | 22.9 | 10 PM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 21.5 | 11 PM | 59.7 | 09 PM |