Thursday, July 31, 2025 – Friday, August 1, 2025
Ozone:
8-hour ozone concentrations are expected to range between Good (Green AQI) and Moderate (Yellow AQI).
PM-2.5 (Fine Particulate):
24-hour daily average concentrations will mostly remain in the Unhealthy for Sensitive Groups (USG, Orange AQI) range, with Unhealthy (Red AQI) concentrations possible in some areas.
Air Quality Advisory: Thursday through Saturday
The Michigan Department of Environment, Great Lakes, and Energy (EGLE) has issued an Air Quality Advisory for elevated levels of fine particulate (PM2.5) across all Michigan counties. PM2.5 concentrations are expected to remain in the USG (Orange AQI) range, with some locations reaching the Unhealthy (Red AQI) range through Saturday.
Forecast Discussion:
Smoke from Canadian wildfires will persist over Michigan on Thursday, keeping PM2.5 levels elevated. While some improvement in air quality is possible in the Lower Peninsula late Thursday into Friday, conditions are expected to worsen again as additional smoke moves into the region. High pressure overhead will limit smoke dispersion, maintaining USG-level pollution and increasing the chance of localized Unhealthy readings through Saturday.
Ozone levels are expected to stay within the Moderate range due to cooler temperatures; however, the presence of surface smoke could cause unexpected increases. Ozone forecasts will be closely monitored through the weekend.
Extended Forecast:
Comfortable weather with sunshine is expected in the extended forecast. We will continue to monitor smoke impacts and adjust pollution forecasts as needed.
Next Forecast Update:
Friday, August 1, 2025