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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 15.4 01 AM 17.8 05 AM
Ashland Bad River Tribal School µg/m³ 10.4 07 AM 12.2 04 AM
Kenosha Chiwaukee Prairie µg/m³ 8.9 12 PM 10.7 12 PM
Sauk Devils Lake µg/m³ 11.9 12 AM 12.4 10 PM
Eau Claire Eau Claire DOT Sign Shop µg/m³ 12.4 12 AM 11.7 09 AM
Brown Green Bay East High µg/m³ 16.1 12 AM 15.4 03 AM
Ozaukee Harrington Beach Park µg/m³ 10.5 12 AM 8.4 02 PM
Dodge Horicon Wildlife Area µg/m³ 12.4 12 AM 18.1 08 PM
Marathon Lake Dubay µg/m³
Dane Madison East µg/m³ 11.4 12 AM 16.1 04 PM
Dane Madison University Ave. Well #6 µg/m³ 14.3 12 AM 17.8 09 PM
Milwaukee Milwaukee-16th St. Health Center µg/m³ 13.7 12 AM 12.8 06 PM
Milwaukee Milwaukee-College Ave NR µg/m³ 10.5 12 AM 12.8 10 PM
Forest Potawatomi µg/m³ 10.4 12 AM 11.8 12 AM
Grant Potosi µg/m³ 13 12 AM 14 06 AM
Waukesha Waukesha-Cleveland Ave. µg/m³ 15.5 12 AM 14.8 08 PM