Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 5.2 | 12 AM | 5.1 | 10 PM |
| Ashland | Bad River Tribal School | µg/m³ | 2.4 | 09 PM | 3.7 | 09 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 7.1 | 12 AM | 17.2 | 09 PM |
| Sauk | Devils Lake | µg/m³ | 3.6 | 12 AM | 4.7 | 01 PM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 2.6 | 07 AM | 2.3 | 12 AM |
| Brown | Green Bay East High | µg/m³ | 5.6 | 12 AM | 10.1 | 11 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 5.2 | 12 AM | 6.7 | 09 PM |
| Dodge | Horicon Wildlife Area | µg/m³ | 5.5 | 12 AM | 7.4 | 06 AM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 3.7 | 12 AM | 5 | 12 PM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 3.9 | 12 AM | 5 | 01 PM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 7.8 | 11 PM | 13.4 | 08 PM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 6.9 | 07 AM | 10 | 09 PM |
| Forest | Potawatomi | µg/m³ | 2.7 | 12 AM | 4.6 | 03 PM |
| Grant | Potosi | µg/m³ | 3.4 | 11 PM | 7.3 | 09 PM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 5.7 | 11 PM | 8.6 | 03 AM |