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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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Sunday, 
County Site Units 24-Hour Hour of Day 1-Hour Hour of Day
Outagamie Appleton µg/m³ 7.7 10 PM 14.8 08 PM
Ashland Bad River Tribal School µg/m³ 4.1 04 PM 4.7 07 AM
Kenosha Chiwaukee Prairie µg/m³ 11.7 06 PM 16.6 01 PM
Sauk Devils Lake µg/m³ 5.4 11 PM 10.1 11 PM
Eau Claire Eau Claire DOT Sign Shop µg/m³ 6 08 PM 7.7 07 AM
Brown Green Bay East High µg/m³ 8 11 PM 17.1 08 PM
Ozaukee Harrington Beach Park µg/m³ 8.5 10 PM 13.2 05 AM
Dodge Horicon Wildlife Area µg/m³ 8.5 12 PM 12 08 AM
Marathon Lake Dubay µg/m³
Dane Madison East µg/m³ 8.5 01 AM 11.6 01 AM
Dane Madison University Ave. Well #6 µg/m³ 10.3 01 AM 22 12 AM
Milwaukee Milwaukee-16th St. Health Center µg/m³ 15.7 07 PM 21.8 12 AM
Milwaukee Milwaukee-College Ave NR µg/m³ 11.8 06 PM 16.2 02 PM
Forest Potawatomi µg/m³ 3.9 11 PM 5.4 11 PM
Grant Potosi µg/m³ 11.7 02 AM 13 06 AM
Waukesha Waukesha-Cleveland Ave. µg/m³ 11.9 07 PM 19.5 12 AM