Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 10.1 | 01 PM | 15.2 | 08 AM |
| Ashland | Bad River Tribal School | µg/m³ | 9.2 | 07 AM | 11.5 | 06 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 9.1 | 06 PM | 11.5 | 10 AM |
| Sauk | Devils Lake | µg/m³ | 11.2 | 10 AM | 14.9 | 06 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 11.9 | 08 AM | 15.2 | 01 AM |
| Brown | Green Bay East High | µg/m³ | 10.6 | 02 PM | 13.9 | 09 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 9.1 | 02 PM | 12.2 | 12 PM |
| Dodge | Horicon Wildlife Area | µg/m³ | 10.8 | 12 PM | 16 | 09 AM |
| La Crosse | La Crosse DOT | µg/m³ | 11.1 | 09 AM | 11.1 | 12 AM |
| Dane | Madison East | µg/m³ | 10.5 | 10 AM | 13.1 | 09 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 11.4 | 11 AM | 14.4 | 08 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 11.9 | 02 PM | 13.6 | 08 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 10.2 | 07 PM | 12.1 | 05 AM |
| Milwaukee | Milwaukee-SER DNR HQ | µg/m³ | 10.3 | 03 PM | 13.7 | 09 AM |
| Taylor | Perkinstown | µg/m³ | 10.1 | 09 AM | 14.2 | 05 AM |
| Forest | Potawatomi | µg/m³ | 8.5 | 11 AM | 13.1 | 09 AM |
| Grant | Potosi | µg/m³ | 12.4 | 11 AM | 20.9 | 12 AM |
| Vilas | Trout Lake | µg/m³ | 7.8 | 08 AM | 11.4 | 07 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 11.3 | 02 PM | 14.8 | 07 AM |