Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 14.7 | 11 PM | 22 | 09 PM |
| Ashland | Bad River Tribal School | µg/m³ | 7.1 | 12 AM | 7.8 | 09 PM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 17.6 | 11 PM | 23.5 | 04 PM |
| Sauk | Devils Lake | µg/m³ | 11.8 | 07 PM | 17.7 | 12 PM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 17.9 | 08 PM | 25.6 | 01 AM |
| Brown | Green Bay East High | µg/m³ | 13.4 | 07 PM | 18.1 | 01 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 14.6 | 11 PM | 23.2 | 01 PM |
| Dodge | Horicon Wildlife Area | µg/m³ | 12.5 | 12 AM | 18.9 | 11 PM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 12.2 | 12 AM | 15.6 | 07 PM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 12.2 | 11 PM | 18.9 | 11 PM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 16.5 | 10 PM | 22.9 | 02 PM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 14.9 | 12 AM | 18.8 | 03 PM |
| Forest | Potawatomi | µg/m³ | 13.2 | 11 PM | 19.3 | 09 AM |
| Grant | Potosi | µg/m³ | 14.1 | 02 PM | 18.7 | 10 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 15.2 | 11 PM | 21 | 10 PM |