Overview

• Air quality alerts remain in effect through Tuesday for Michigan’s Upper Peninsula and across nine Midwestern and Northeastern states as smoke plumes drift southward.
• The National Weather Service links persistent haze to a high-pressure system funneling emissions from 717 active Canadian wildfires into the U.S. heartland.
• Fine particulate matter concentrations have reached unhealthy levels in cities such as Minneapolis, Chicago and Detroit, with IQAir listing some among the world’s worst.
• Health officials urge people with respiratory or heart conditions, older adults, children and pregnant women to limit outdoor exposure and use air purifiers or N95 masks.
• The Canadian Interagency Forest Fire Centre reports 717 active blazes across multiple provinces, many out of control, as this season’s burned area exceeds historical norms.