By Meteorologists Dakota Smith, Brandon Miller, CNN
(CNN) — Thick, choking plumes of smoke from Canadas wildfires are pouring into major cities across the Midwest, Northeast and Mid-Atlantic, bringing dangerous air quality to more than 100 million people. The polluted air will last through at least Saturday in some areas as new waves of smoke waft south.
Track air quality and get your forecast in the CNN Weather app
Here’s the latest:
• Choking air pollution: More than 100 million people in 18 states and the District of Columbia are under Air Quality Alerts, many of which note that the air pollution is so high, even healthy adults will be affected. “The risk of health effects is increased for everyone,” the Washington, DC, air quality council said in its alert.
• Where is it going? The smoke is being carried south from Canada in the wind. On Friday, the plume pushed farther south, making the DC area the new East Coast-epicenter of air pollution. The weather patterns will determine which parts of the US have the worst smoke each day.
• Relief is coming: Poor air quality is likely to be an issue through Saturday as the wind pushes the smoke back into the Northeast. But rain and storms are in the forecast, which will help wash the smoke out of the air and provide some relief.
Track the smoke
Smoke has already been an issue this summer in parts of the West, Plains and Midwest as stateside fires have burned more than 3.6 million acres, mostly in the western half of the country. But the thicker smoke that has moved over the Great Lakes and Northeast is from wildfires to the north.
In Canada, 3,500 fires have burned more than 6 million acres this summer, with a dozen blazes flaring up in Ontario in recent weeks, filling the skies with smoke drifting south, like it did in an extreme way in 2023.
Canadian wildfire activity this year is nowhere near the hyperactivity of 2023 but the combination of wildfires in Ontario and a heat dome in the central US spells smoky trouble for millions.
Planet-heating fossil fuel pollution is increasing the chance of prolonged smoke seasons as it tips the odds that extreme wildfire seasons like 2023’s — Canada’s worst season on record — won’t remain an outlier for long.
Wildfire smoke contains dangerous, tiny pollutants called PM2.5 that can travel deep into the lungs or enter the bloodstream when inhaled. The minuscule particles can lead to breathing problems like bronchitis and cause inflammation that aggravates diabetes, heart disease and other health conditions.
People with lung or heart disease, children and older adults are especially at risk for smoke-related illness. The NWS advises people avoid smoke by limiting outdoor activities and keeping windows closed overnight.
The only silver lining the smoke brings is that it could dampen some of the heat. Smoke blocks sunlight, which would be welcome news for many parts of the Northeast expected to see high temperatures in the coming days.
The smoke is now streaming into the US thanks to a record-breaking heat dome parked over the central part of the country.
So far there have been several heat domes — large, slow-moving high pressure systems — this year from the West Coast to the Northeast. Air flows clockwise around these domes, but until now, none of them have been in quite the right spot to drag Canadian smoke south.
The northern edge of this week’s heat dome is perfectly placed over northern Minnesota and southern Ontario, where wildfires rage. This placement means smoke will flow east and south, right into parts of the Midwest and Northeast.
With several months left in wildfire season, the door will remain open for more Canadian smoke plumes to migrate south.
How does this smoke compare to 2023?
This time three years ago, records were being broken as 4,300 fires had already burned 25 million acres across Canada.
In June 2023, smoke consumed the New York City skyline as northerly winds pushed a wall of wildfire smoke from Quebec into the Big Apple.
The culprits were a dominant high pressure system in the Hudson Bay and a storm system over Atlantic Canada. Together, they funneled smoke into the Midwest and Northeast.
Both systems were stagnant, keeping the smoke in place for about four days.
2023’s smoke event was so far-reaching, a study from last year estimates more than 350 million people were exposed to daily wildfire smoke-induced air pollution.
Fortunately, wildfire activity in Canada started later compared to that record-setting year, making it unlikely this year’s smoke will be as pervasive.
Smoke seasons are getting worse
In the US, the window for outbreaks of unhealthy wildfire smoke is getting bigger, as fire seasons in the West have become longer and more extreme.
Climate change was found to be responsible for the majority of the increase of surface wildfire smoke. This smoke has eroded decades of air quality improvements in parts of the US, particularly in the West.
Planet-warming pollution caused approximately 15,000 more deaths in the US from wildfire particulate matter from 2006 to 2020 than would have otherwise occurred in a cooler world, a study published last year found.
The-CNN-Wire™ & © 2026 Cable News Network, Inc., a Warner Bros. Discovery Company. All rights reserved.
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