Overview

• Air quality alerts span at least 14 states from the Upper Midwest to the Northeast, with AQI readings reaching levels unhealthy for sensitive groups
• The National Weather Service has issued Code Orange and Ozone Action Day advisories urging children, older adults and people with heart or lung conditions to limit outdoor exertion
• Canada is battling its second-worst wildfire season on record with over 700 active fires—nearly 200 classified as out-of-control—and more than 16.5 million acres burned
• Health agencies recommend using N95 masks, running indoor air filters with MERV-13 or higher filters and closing windows to reduce smoke exposure
• Meteorologists forecast shifting winds by Wednesday to begin clearing the haze even as Canadian blazes continue to burn