Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 21 | 08 PM | 29.7 | 03 PM |
| Ashland | Bad River Tribal School | µg/m³ | 14.4 | 04 PM | 21.8 | 04 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 16.5 | 04 PM | 16.8 | 03 PM |
| Sauk | Devils Lake | µg/m³ | 21.6 | 07 PM | 28 | 07 PM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 19.7 | 06 PM | 23.7 | 12 AM |
| Brown | Green Bay East High | µg/m³ | 17.7 | 08 PM | 22.7 | 01 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 17.5 | 10 PM | 23.5 | 02 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 19.8 | 09 PM | 27.7 | 12 AM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 18 | 05 PM | 21.2 | 05 PM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 18.4 | 04 PM | 21.1 | 05 PM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 17.1 | 09 PM | 25.2 | 01 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 15.7 | 06 PM | 22.2 | 12 AM |
| Forest | Potawatomi | µg/m³ | 14.6 | 08 PM | 16.9 | 04 PM |
| Grant | Potosi | µg/m³ | 21 | 12 PM | 25.9 | 12 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 18.4 | 08 PM | 26.9 | 12 AM |