Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 9.4 | 12 PM | 12.8 | 10 AM |
| Ashland | Bad River Tribal School | µg/m³ | 3.3 | 12 AM | 4 | 07 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 9 | 12 AM | 27 | 11 PM |
| Sauk | Devils Lake | µg/m³ | 5.9 | 11 PM | 21 | 11 PM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 6.5 | 07 PM | 10.3 | 06 PM |
| Brown | Green Bay East High | µg/m³ | 12 | 12 PM | 18.1 | 08 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 7.9 | 10 AM | 13 | 09 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 10.1 | 10 AM | 16 | 11 PM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 10.4 | 10 AM | 22.8 | 11 PM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 9.8 | 11 PM | 22.5 | 11 PM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 11.1 | 08 AM | 23.3 | 08 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 9.5 | 11 PM | 22.5 | 11 PM |
| Forest | Potawatomi | µg/m³ | 3.2 | 06 PM | 4 | 12 AM |
| Grant | Potosi | µg/m³ | 14.1 | 11 PM | 33 | 05 PM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 16 | 11 AM | 32.1 | 08 AM |