Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 28.8 | 06 AM | 35.6 | 12 AM |
| Ashland | Bad River Tribal School | µg/m³ | 23.7 | 07 AM | 25.8 | 05 PM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 34.5 | 05 PM | 64.5 | 04 AM |
| Sauk | Devils Lake | µg/m³ | 34.6 | 08 PM | 72.3 | 01 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 34.1 | 06 PM | 53.2 | 07 AM |
| Brown | Green Bay East High | µg/m³ | 20.5 | 05 AM | 15.4 | 05 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 14.8 | 02 PM | 29.3 | 01 AM |
| Jackson | Ho-Chunk Nation-Black River Falls | µg/m³ | 31.2 | 07 PM | 51 | 06 AM |
| Monroe | Ho-Chunk Nation-Tomah | µg/m³ | 29.6 | 08 PM | 57.1 | 06 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 27.8 | 10 AM | 51.8 | 12 AM |
| Marathon | Lake Dubay | µg/m³ | 24 | 07 AM | 39.6 | 02 AM |
| Dane | Madison East | µg/m³ | 27.6 | 08 PM | 50.6 | 03 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 35.7 | 08 PM | 57.5 | 03 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 35 | 01 PM | 61.4 | 12 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 31.1 | 03 PM | 60.7 | 02 AM |
| Forest | Potawatomi | µg/m³ | 35.2 | 04 AM | 19.8 | 12 AM |
| Grant | Potosi | µg/m³ | 32.5 | 11 PM | 60.5 | 07 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 28 | 02 PM | 42 | 02 AM |