Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 17.8 | 08 PM | 36.4 | 04 AM |
| Ashland | Bad River Tribal School | µg/m³ | 6.3 | 04 PM | 14.4 | 01 PM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 20.3 | 09 AM | 23.5 | 05 AM |
| Sauk | Devils Lake | µg/m³ | 16.2 | 09 PM | 29.3 | 07 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 10.9 | 04 PM | 18.5 | 02 PM |
| Brown | Green Bay East High | µg/m³ | 19.4 | 05 PM | 32.1 | 03 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 17.9 | 02 PM | 26.3 | 01 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 16.2 | 09 PM | 31.1 | 03 AM |
| La Crosse | La Crosse DOT | µg/m³ | 11.5 | 06 PM | 19.2 | 06 PM |
| Dane | Madison East | µg/m³ | 17.4 | 10 PM | 30.2 | 07 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 18.9 | 10 PM | 33.4 | 04 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 20.7 | 11 AM | 29.5 | 12 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 19.7 | 03 PM | 26.6 | 06 AM |
| Taylor | Perkinstown | µg/m³ | 9.8 | 05 PM | 15.5 | 03 PM |
| Forest | Potawatomi | µg/m³ | 6.7 | 06 PM | 9.4 | 04 PM |
| Grant | Potosi | µg/m³ | 17.9 | 10 PM | 33.6 | 07 PM |
| Vilas | Trout Lake | µg/m³ | 6.1 | 04 PM | 9 | 03 PM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 19.7 | 04 PM | 30.9 | 12 AM |