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Noise monitoring program
Active Air Quality Notification
  • An air quality ADVISORY for Unhealthy for Sensitive Groups OZONE levels is in effect from 7/4/2025 08:00 to 7/4/2025 23:00 for these counties: Kenosha,Milwaukee,Ozaukee,Racine .

  • Increases in firework displays over the holiday weekend may lead to short-lived, local spikes in PM2.5 concentrations. Visit https://dnr.wisconsin.gov/topic/AirQuality/Fireworks.html to learn more about air quality and health effects of fireworks.

Highest PM2.5

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Monday, 
County Site Units 24-Hour Hour of Day 1-Hour Hour of Day
Outagamie Appleton µg/m³ 13.6 03 PM 17.9 09 PM
Ashland Bad River Tribal School µg/m³ 6 08 PM 9.1 12 PM
Kenosha Chiwaukee Prairie µg/m³ 12.4 08 PM 17.5 07 AM
Sauk Devils Lake µg/m³ 10.1 11 AM 12.9 05 AM
Eau Claire Eau Claire DOT Sign Shop µg/m³ 10 12 AM 11.1 04 AM
Brown Green Bay East High µg/m³ 15.1 11 PM 43 11 PM
Ozaukee Harrington Beach Park µg/m³ 10.4 11 PM 16.2 01 PM
Dodge Horicon Wildlife Area µg/m³ 12.4 04 PM 20.8 06 AM
Marathon Lake Dubay µg/m³
Dane Madison East µg/m³ 12.3 10 AM 18.5 02 AM
Dane Madison University Ave. Well #6 µg/m³ 14.2 03 PM 20.7 03 AM
Milwaukee Milwaukee-16th St. Health Center µg/m³ 22.7 08 PM 55.5 01 AM
Milwaukee Milwaukee-College Ave NR µg/m³ 13.7 07 PM 23.2 12 AM
Forest Potawatomi µg/m³ 8.7 01 PM 11.3 04 AM
Grant Potosi µg/m³ 10.6 10 AM 13.2 12 AM
Waukesha Waukesha-Cleveland Ave. µg/m³ 14.8 08 PM 29.1 06 AM