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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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Saturday, 
County Site Units 24-Hour Hour of Day 1-Hour Hour of Day
Outagamie Appleton µg/m³ 10.6 11 PM 20.1 09 PM
Ashland Bad River Tribal School µg/m³ 6.5 05 AM 7.7 02 AM
Kenosha Chiwaukee Prairie µg/m³ 8.3 08 PM 11.4 02 AM
Sauk Devils Lake µg/m³ 7.3 04 PM 8.7 11 AM
Eau Claire Eau Claire DOT Sign Shop µg/m³ 9.3 04 PM 11.7 01 AM
Brown Green Bay East High µg/m³ 9.8 11 PM 15.3 10 PM
Ozaukee Harrington Beach Park µg/m³ 7.4 09 PM 9.8 09 PM
Dodge Horicon Wildlife Area µg/m³ 8 11 PM 11.2 11 PM
Marathon Lake Dubay µg/m³
Dane Madison East µg/m³ 6.7 09 PM 8 12 PM
Dane Madison University Ave. Well #6 µg/m³ 8.4 11 PM 19.8 10 AM
Milwaukee Milwaukee-16th St. Health Center µg/m³ 9.9 05 PM 14 11 PM
Milwaukee Milwaukee-College Ave NR µg/m³ 8.6 06 PM 11.6 10 PM
Forest Potawatomi µg/m³ 5.3 04 PM 6.5 12 AM
Grant Potosi µg/m³ 9 03 PM 10.3 12 AM
Waukesha Waukesha-Cleveland Ave. µg/m³ 9.3 05 PM 11.9 12 AM