Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 13.2 | 05 AM | 36.4 | 04 AM |
| Ashland | Bad River Tribal School | µg/m³ | 4.2 | 02 AM | 6.1 | 12 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 18.5 | 05 AM | 23.5 | 05 AM |
| Sauk | Devils Lake | µg/m³ | 8.6 | 05 AM | 27.7 | 05 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 8.9 | 04 AM | 15.3 | 03 AM |
| Brown | Green Bay East High | µg/m³ | 14.6 | 05 AM | 32.1 | 03 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 15.3 | 05 AM | 26.3 | 01 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 12.4 | 05 AM | 31.1 | 03 AM |
| La Crosse | La Crosse DOT | µg/m³ | 8.5 | 05 AM | 12.5 | 12 AM |
| Dane | Madison East | µg/m³ | 11.7 | 05 AM | 29.6 | 03 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 12.1 | 05 AM | 33.4 | 04 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 18.3 | 05 AM | 29.5 | 12 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 17.2 | 05 AM | 25.5 | 05 AM |
| Taylor | Perkinstown | µg/m³ | 8.3 | 05 AM | 14.4 | 12 AM |
| Forest | Potawatomi | µg/m³ | 5.4 | 01 AM | 6.5 | 12 AM |
| Grant | Potosi | µg/m³ | 11.3 | 05 AM | 28.5 | 03 AM |
| Vilas | Trout Lake | µg/m³ | 5.1 | 01 AM | 5.5 | 12 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 17.3 | 05 AM | 30.9 | 12 AM |