Overview

• Air Quality Advisories issued by EGLE and the National Weather Service remain active in 14 Upper Peninsula counties until Friday at midnight while code orange alerts persist in southeastern Pennsylvania through Thursday at midnight.
• Fine particulate matter (PM2.5) is in the Unhealthy for Sensitive Groups range across the affected areas with forecasts indicating possible short-term spikes into the Unhealthy category.
• Forecast models show the Canadian smoke plume moving into northern Lower Michigan by Wednesday and potentially drifting over the I-96 corridor before conditions begin to ease.
• Health officials recommend that people with heart or respiratory conditions avoid strenuous outdoor activities, keep windows closed overnight, and use central air systems equipped with MERV-13 or higher filters.
• This episode is part of the broader 2025 Canadian wildfire season which has fueled a series of cross-border smoke events and sustained Air Quality Action Days across the Great Lakes region.