Canadian Wildfire Smoke Is Hitting the Northeast: What's Going On? (July 2026)
Photo by Ahmer Kalam on Unsplash
If the sky outside looks milky and orange, or you smelled smoke this morning, here is the short version: smoke from wildfires in Canada and Minnesota has pushed into the Great Lakes and Northeast, and air quality advisories are in effect from Minnesota to Washington, D.C. Here is what is happening and how to track it where you are.
What's Happening Right Now
As of Wednesday, July 15, 2026, smoke from nearly 200 active wildfires in Ontario, plus fires in northeast Minnesota, is being pushed south by northwest winds and settling toward the surface across the Great Lakes and Northeast. It is part of a fire season that is already breaking records.
You can see it on the PurpleAir map above: a dense band of orange, red, and deep purple sensors, the highest PM2.5 readings, running from Minnesota and the Great Lakes into New York and New England, while much of the country stays green and yellow.
Advisories went up fast. New York issued a statewide Air Quality Health Advisory, with the AQI forecast above 100 and possibly above 150. Boston reached about 130, in the "unhealthy for sensitive groups" range. Michigan and Wisconsin issued statewide alerts, and northern Minnesota saw hazardous air and evacuations. Forecasters expect the smoke to linger for several days, with a second wave possible in New England on Thursday, July 16.
What's Burning, and How Much
Nationally, Public Safety Canada reported about 796 active wildfires, with roughly 3,137 fires and 1.4 million hectares (about 3.5 million acres) burned so far this season, more fires than in 2025 but less total area. Ontario alone was managing 185 active fires, 148 of them in the northwest, and has recorded 453 fires year to date against a 10-year average of 312. Closer to home, about 17 fires were burning roughly 55,000 acres across northern Minnesota, and the entire Boundary Waters has closed for only the third time in its history, with evacuations across Lake and St. Louis counties. These numbers change daily, so treat them as a mid-July snapshot.
Track It in Real Time on the PurpleAir Map
This is a fine particle (PM2.5) event, the microscopic particles that make up most wildfire smoke, and PM2.5 is exactly what the PurpleAir map measures in real time, block by block. In New York City, ground-level ozone stayed in the "good" range even as PM2.5 pushed the AQI past 100, so this is a smoke problem, not a smog problem.
A statewide advisory tells you the air may be unhealthy somewhere in your region. The map tells you what it is doing on your block, this minute. Zoom to your exact location, tap a sensor to see whether levels are rising or falling, and cross-check with the AirNow Fire and Smoke Map, which adds fire locations and satellite smoke plumes. If you are new to the numbers, how to read your PurpleAir data and how wildfire smoke travels will get you up to speed.
How to Protect Yourself
- Stay inside with windows closed and run AC on recirculate.
- Filter your indoor air with a HEPA purifier, or set up a clean room if levels are high.
- Wear a well-fitting N95 if you have to be out in heavy smoke.
- Take extra care with sensitive groups: children, older adults, pregnant people, and anyone with heart or lung conditions. See wildfire smoke and sensitive groups for more.
In some cities this smoke is arriving during extreme heat, which is harder on the body than either hazard alone. Running AC on recirculate keeps you cool without pulling smoke inside; we cover the combination in heat and wildfire smoke.
Watch Your Indoor Air Too
When you are sheltering inside, the reading that matters most is the one in the room where you are actually breathing, because smoke slips in through gaps and older windows. An indoor monitor like the PurpleAir Touch makes that visible: its full-color LED ring glows the US EPA AQI color so you can read your indoor air at a glance, and it reports PM2.5 to the PurpleAir map in real time so you can confirm your purifier is keeping up. If the number climbs, turn up filtration and hold off on indoor sources like candles, frying, or vacuuming.
Save 10% this week. Through Sunday, July 19, use this link to take 10% off the PurpleAir Touch, with the discount applied automatically at checkout.
The Bottom Line
This week's smoke is widespread and unhealthy, though forecasters say it will not be as intense across the Northeast as the historic June 2023 event. Still, "unhealthy for sensitive groups" air is a real risk, and levels can spike fast, so watch the air where you actually are, filter your indoor air, and look out for the people most at risk.
Check current conditions on the PurpleAir map, or bring monitoring home with an air quality monitor.