Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 16.4 | 01 PM | 25.2 | 08 AM |
| Ashland | Bad River Tribal School | µg/m³ | 8 | 05 PM | 15.9 | 03 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 15.4 | 01 PM | 25 | 10 AM |
| Sauk | Devils Lake | µg/m³ | 16.4 | 09 AM | 22.4 | 07 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 15 | 08 AM | 19.8 | 03 AM |
| Brown | Green Bay East High | µg/m³ | 14.7 | 01 PM | 23 | 08 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 13.4 | 11 AM | 22 | 09 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 16.2 | 11 AM | 22.3 | 03 AM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 15.7 | 09 AM | 21.4 | 07 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 16.2 | 09 AM | 21.4 | 06 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 17.3 | 11 AM | 26.7 | 08 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 16.8 | 12 PM | 26.1 | 10 AM |
| Forest | Potawatomi | µg/m³ | 14.9 | 12 PM | 25.5 | 05 AM |
| Grant | Potosi | µg/m³ | 4.8 | 06 PM | ||
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 17 | 10 AM | 24.8 | 09 AM |