Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 14.9 | 11 PM | 27.7 | 07 PM |
| Ashland | Bad River Tribal School | µg/m³ | 13.5 | 12 AM | 17.5 | 01 PM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 8.7 | 11 PM | 10.7 | 02 AM |
| Sauk | Devils Lake | µg/m³ | 8 | 09 PM | 9.5 | 11 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 11.5 | 11 PM | 14.5 | 04 PM |
| Brown | Green Bay East High | µg/m³ | 13.8 | 11 PM | 19.5 | 09 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 9 | 11 PM | 12 | 11 PM |
| Dodge | Horicon Wildlife Area | µg/m³ | 9.6 | 11 PM | 12.9 | 07 PM |
| Marathon | Lake Dubay | µg/m³ | 14.7 | 11 PM | 19.4 | 09 PM |
| Dane | Madison East | µg/m³ | 7.6 | 01 PM | 9.5 | 11 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 7.9 | 11 AM | 9.6 | 11 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 10 | 11 PM | 11.9 | 03 PM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 9.4 | 10 PM | 10.7 | 08 AM |
| Forest | Potawatomi | µg/m³ | 17.6 | 07 AM | 17.5 | 09 AM |
| Grant | Potosi | µg/m³ | 7.9 | 06 AM | 9.3 | 02 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 9.7 | 11 PM | 11.6 | 06 PM |