Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 20.9 | 04 PM | 24 | 07 AM |
| Ashland | Bad River Tribal School | µg/m³ | 7.6 | 11 AM | 11.3 | 05 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 13.3 | 11 PM | 27.6 | 11 PM |
| Sauk | Devils Lake | µg/m³ | 18.9 | 09 PM | 23.2 | 06 PM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 24.6 | 11 PM | 39.7 | 02 AM |
| Brown | Green Bay East High | µg/m³ | 18 | 05 PM | 24.4 | 04 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 18.2 | 09 PM | 33.9 | 07 PM |
| Dodge | Horicon Wildlife Area | µg/m³ | 19 | 07 PM | 21.7 | 11 AM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 17.2 | 11 PM | 26.1 | 09 PM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 17 | 11 PM | 22.9 | 09 PM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 17.7 | 11 PM | 33 | 08 PM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 18 | 11 PM | 35.4 | 09 PM |
| Forest | Potawatomi | µg/m³ | 12.5 | 12 PM | 16.4 | 09 AM |
| Grant | Potosi | µg/m³ | 16.9 | 11 PM | 27.9 | 11 PM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 17.6 | 11 PM | 27.3 | 08 PM |