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 | 5.1 | 09 AM | 6.1 | 10 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 9.9 | 07 PM | 15.8 | 08 AM |
| Sauk | Devils Lake | µg/m³ | 7.6 | 08 PM | 11.2 | 01 PM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 7.3 | 01 PM | 10 | 06 AM |
| Brown | Green Bay East High | µg/m³ | 8 | 02 PM | 10.2 | 01 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 7 | 11 AM | 8.1 | 09 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 7.9 | 09 PM | 11 | 07 PM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 7 | 08 PM | 9.8 | 03 PM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 7.7 | 06 PM | 11.2 | 03 PM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 9.8 | 09 PM | 12.4 | 07 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 9.4 | 06 PM | 13.2 | 03 PM |
| Forest | Potawatomi | µg/m³ | 8.4 | 12 PM | 11.8 | 12 AM |
| Grant | Potosi | µg/m³ | 8.1 | 09 PM | 11.2 | 05 PM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 9.2 | 10 PM | 11.1 | 06 PM |