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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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Friday, 
County Site Units 24-Hour Hour of Day 1-Hour Hour of Day
Outagamie Appleton µg/m³ 7.5 12 AM 10.4 12 AM
Ashland Bad River Tribal School µg/m³ 6.7 11 PM 10.8 11 PM
Kenosha Chiwaukee Prairie µg/m³ 7.8 06 AM 7 02 AM
Sauk Devils Lake µg/m³ 9.7 05 PM 16.2 07 AM
Eau Claire Eau Claire DOT Sign Shop µg/m³ 8.7 12 AM 9.2 01 AM
Brown Green Bay East High µg/m³ 8.5 12 AM 7.2 03 AM
Ozaukee Harrington Beach Park µg/m³ 7.3 02 AM 9.7 02 AM
Dodge Horicon Wildlife Area µg/m³ 9.1 08 AM 12 03 AM
Marathon Lake Dubay µg/m³
Dane Madison East µg/m³ 7.1 10 PM 9.5 07 AM
Dane Madison University Ave. Well #6 µg/m³ 11 05 PM 17.5 07 AM
Milwaukee Milwaukee-16th St. Health Center µg/m³ 10.9 06 AM 12 12 AM
Milwaukee Milwaukee-College Ave NR µg/m³ 8.3 07 AM 11.5 02 AM
Forest Potawatomi µg/m³ 6 12 AM 6.8 06 PM
Grant Potosi µg/m³ 7.6 07 PM 10.2 10 AM
Waukesha Waukesha-Cleveland Ave. µg/m³ 9.8 12 PM 14.2 04 AM