Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | ||||
| Ashland | Bad River Tribal School | µg/m³ | 4.4 | 10 PM | 5.1 | 11 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 6.9 | 11 PM | 12.7 | 08 PM |
| Sauk | Devils Lake | µg/m³ | 4.2 | 11 PM | 6.1 | 11 PM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 5.9 | 06 PM | 8 | 10 AM |
| Brown | Green Bay East High | µg/m³ | 7.9 | 11 PM | 12.5 | 06 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 6.2 | 10 PM | 8.6 | 11 PM |
| Dodge | Horicon Wildlife Area | µg/m³ | 5.9 | 10 PM | 7.5 | 07 PM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 6.7 | 03 PM | 7.3 | 11 PM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 6 | 11 PM | 9.7 | 07 PM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 9.9 | 06 PM | 16.3 | 06 PM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 8.2 | 05 PM | 10.8 | 07 PM |
| Forest | Potawatomi | µg/m³ | 5.1 | 11 PM | 8 | 11 PM |
| Grant | Potosi | µg/m³ | 6.2 | 11 PM | 7.9 | 03 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 9.7 | 10 PM | 17.5 | 08 PM |