Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 10.8 | 01 PM | 12.7 | 04 AM |
| Ashland | Bad River Tribal School | µg/m³ | 7.2 | 07 AM | 12.4 | 04 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 10.3 | 09 AM | ||
| Sauk | Devils Lake | µg/m³ | 11.4 | 02 PM | 13.2 | 03 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 11.4 | 09 AM | 13.6 | 12 AM |
| Brown | Green Bay East High | µg/m³ | 12.2 | 02 PM | 13.6 | 12 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 10.9 | 04 PM | 12.1 | 12 AM |
| Jackson | Ho-Chunk Nation-Black River Falls | µg/m³ | 11.8 | 11 AM | 13.5 | 01 AM |
| Monroe | Ho-Chunk Nation-Tomah | µg/m³ | 11.7 | 11 AM | 14 | 01 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 12.6 | 04 PM | 13.5 | 01 AM |
| Marathon | Lake Dubay | µg/m³ | 10.6 | 12 PM | 13.2 | 03 AM |
| Dane | Madison East | µg/m³ | 12.1 | 04 PM | 13.2 | 03 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 12.8 | 03 PM | 14.2 | 06 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 12.5 | 04 PM | 14.4 | 12 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 11.9 | 02 PM | 14.3 | 06 AM |
| Forest | Potawatomi | µg/m³ | 13 | 03 PM | 15 | 04 AM |
| Grant | Potosi | µg/m³ | 11.7 | 09 AM | 13.1 | 02 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 12.9 | 03 PM | 14.7 | 05 AM |