Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 18.3 | 12 AM | 25.8 | 04 AM |
| Ashland | Bad River Tribal School | µg/m³ | 7.7 | 11 PM | 17.4 | 11 PM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 23.5 | 10 AM | 30.8 | 08 AM |
| Sauk | Devils Lake | µg/m³ | 19 | 04 PM | 28.2 | 01 PM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 25.4 | 01 AM | 35.3 | 12 AM |
| Brown | Green Bay East High | µg/m³ | 15.3 | 12 AM | 13.4 | 10 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 17.8 | 12 AM | 18.2 | 11 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 20.2 | 07 AM | 33.4 | 06 AM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 24.3 | 03 PM | 29.2 | 06 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 22.5 | 04 PM | 30.3 | 11 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 23.7 | 11 AM | 28.9 | 10 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 25.2 | 10 AM | 27.8 | 10 AM |
| Forest | Potawatomi | µg/m³ | 10.1 | 12 AM | 13.8 | 10 PM |
| Grant | Potosi | µg/m³ | 23.1 | 04 PM | 29.7 | 03 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 25 | 11 AM | 38 | 08 AM |