Pollutant Overview
Ozone Forecast:
8-hour ozone concentrations are expected to range between Good (Green AQI) and Moderate (Yellow AQI). Cloud cover and cooler air will help limit ozone levels, though smoke may cause localized increases.
PM-2.5 Forecast (Fine Particulates):
24-hour average PM-2.5 concentrations will increase into the Unhealthy for Sensitive Groups (USG, Orange AQI) range across Michigan. Some locations, especially in northern areas, may see Unhealthy (Red AQI) levels as smoke from Canadian wildfires moves through the state.
Air Quality Advisory:
An Air Quality Advisory is in effect for all Michigan counties on Wednesday and Thursday due to elevated levels of fine particulate (PM2.5). This will be re-evaluated Thursday morning to determine if an extension is needed.
Forecast Discussion:
Smoke from Canadian wildfires entered northern Michigan Tuesday and will continue spreading southward through Thursday. A cold front will aid in pulling this smoke further into the state. High pressure settling in behind the front will bring north to northeast winds, continuing the influx of smoke and potentially trapping it near the surface.
Ozone levels are expected to remain in the Good to Moderate range due to cooler temperatures, cloud cover, and precipitation, though localized increases are possible in areas with persistent surface smoke.
Extended Forecast:
Pleasant weather is expected as we move toward the weekend, but lingering smoke may continue to influence air quality. Conditions will be monitored closely.
Next Forecast Update:
Thursday, July 31, 2025