A thick blanket of wildfire smoke is spreading across the Midwest and Northeast this week, pushing air quality into unhealthy — and in some places hazardous — territory for millions of Americans, just as a punishing mid-July heat wave bears down on many of the same communities.
The smoke is pouring in from more than 800 active wildfires burning across Canada, from the Northwest Territories to Labrador, along with fires in northeastern Minnesota that have burned since May and flared up dramatically on July 14, according to weather.com senior meteorologist Jonathan Erdman. Statewide air quality alerts are in effect in Minnesota, Michigan, Wisconsin, New York, New Jersey, and Delaware, with impacts expected from the Great Lakes down the entire Interstate 95 corridor — New York, Philadelphia, Baltimore, and Washington, D.C. included.
Where the Air Is Worst
Minnesota is bearing the brunt. The state’s air quality alert runs from Tuesday through at least Friday morning, and CBS News Minnesota reported that parts of the northeastern Arrowhead region — including Grand Portage and Two Harbors — are expected to reach the maroon “hazardous” category, the worst level on the Air Quality Index, where all outdoor activity is discouraged. Duluth, Ely, Hibbing, and Hinckley are forecast to hit purple “very unhealthy” levels, while the Twin Cities metro, St. Cloud, Brainerd, Moorhead, Alexandria, and Winona sit in the red “unhealthy” zone.
The plume does not stop at state lines. CBS News reported that Michigan issued a statewide alert for Wednesday due to fine particulate pollution, with smoke also degrading air quality in Milwaukee, Detroit, Boston, Maine, western and central New York, and northern Pennsylvania. Forecasters expect the haze to intensify Wednesday afternoon and push toward Washington, D.C. by Thursday midday, with impacts lingering into Friday as far south as the central Appalachians and Carolinas, per weather.com.
Why This Round Is Especially Dangerous
What makes this event more than a hazy nuisance is the timing: the smoke is arriving hand in hand with extreme heat, with forecasts near 100 degrees in parts of the affected region. That combination puts real strain on the human body.
“The body has a harder time dealing with both of those stressors at the same time,” Ryan Lueck of the Minnesota Pollution Control Agency told CBS News Minnesota. Physician Beth Stegora added in the same report that the pairing of heat and poor air quality drives a significant increase in emergency room visits for heat-related illness.
The fine particulate matter in wildfire smoke — small enough to penetrate deep into the lungs and enter the bloodstream — can cause coughing, shortness of breath, scratchy throat, burning eyes, dizziness, and fatigue, and can aggravate existing heart and lung conditions, according to CBS News, which noted that long-term exposure to fine particle pollution is a leading cause of premature death. Columbia University Climate School associate professor Dan Westervelt told CBS News the region has seen “a perfect storm for really dry conditions to provide a lot of fuel for these wildfires to burn.”
How to Protect Yourself
Health officials’ advice follows the color-coded Air Quality Index, which you can check for your ZIP code at AirNow.gov. When the AQI reaches orange, sensitive groups — children, older adults, pregnant people, and anyone with asthma, COPD, or heart disease — should cut back on time outdoors, per weather.com. When it climbs to red, purple, or maroon, everyone should limit outdoor exposure and move exercise indoors.
Experts cited by CBS News recommend staying inside with windows closed, running an air purifier or a properly fitted HVAC filter, and wearing an N95 mask — not a cloth or surgical mask — if you must spend time outside. Because the smoke coincides with dangerous heat, doctors also stress hydration and access to air conditioning; cooling centers are an option for those without it.
Officials also urge residents in affected areas to avoid adding to the pollution burden while alerts are active — that means holding off on backyard fires, unnecessary driving, and gas-powered lawn equipment, all of which compound the fine-particle load in already saturated air. Parents should keep an eye on summer camps and outdoor sports schedules, many of which are moving activities indoors or canceling them outright in the hardest-hit counties.
The reprieve, when it comes, will be gradual. Weather.com’s forecast calls for the heaviest near-surface smoke Thursday from the upper Midwest through the Northeast, with lighter but still noticeable haze lingering into Friday. Until then, the safest place for tens of millions of Americans is, unfortunately, indoors — with a close eye on the AQI dial.
