Canadian Fires

 Canadian Fires

For the past 4 or 5 years now, the USA has had to endure the unhealthy smoke from the Canadian fires. I had a conversation with ChatGPT about it.

You're remembering correctly. While smoke from Canadian wildfires has occasionally reached the mid-Atlantic for decades, what has changed is how often it happens and how severe it has become. The past 4–5 years have included several exceptionally active Canadian fire seasons, making smoke in that area much more common than most people remember.

There are several reasons:

1. Canada has had much larger wildfire seasons.
   Warmer temperatures, earlier snowmelt, longer dry periods, and more lightning have increased the amount of forest that burns. Canada's 2023 wildfire season was the largest on record, and 2025 and 2026 have also seen extensive fires in several provinces.
2. The fires are occurring farther east.
   Historically, many of Canada's biggest fires were in British Columbia and the far west. In recent years, major fires have also occurred in Ontario and Quebec. Smoke from eastern Canada has a much shorter path than smoke from western Canada.

3. The weather pattern often favors the Northeast.
   During many summer weather patterns:

   • low-pressure systems move across eastern Canada,
   • winds circulate counterclockwise around them,
   • the jet stream dips southward,
   • and that combination acts like a conveyor belt carrying smoke directly into New York, New Jersey, and Pennsylvania.

   
   

4. There is simply more smoke available.
   Even if wind patterns were identical to decades ago, a much larger amount of burning means much larger smoke plumes that can travel thousands of miles without dissipating.

As for your question, "Why every year now?"

It's not that the atmosphere has permanently changed to send smoke here every summer. Rather, the combination of:

• more frequent large Canadian wildfires,
• more fires in eastern Canada,
• and normal summertime wind patterns

means that there are many more opportunities for smoke to reach the Mid-Atlantic. Researchers describe this as part of a broader shift in North American summertime air quality, with wildfire smoke becoming a much larger contributor than it was a few decades ago.

Interestingly, before about 2023, many people said exactly what you did: "I don't remember this ever happening." While isolated events occurred in the past, they were much less frequent and usually stayed high in the atmosphere without producing the widespread haze and unhealthy air quality seen in recent summers.

So your memory is consistent with what many meteorologists and climate researchers have observed. The smoke isn't new, but the frequency and intensity of smoke events have increased noticeably over the past several years because Canadian wildfire seasons have become larger and more persistent. 

I asked ChatGPT what is starting the Canadian fires?

The short answer is that both lightning and people start Canadian wildfires. The exact mix changes by province and by time of year.

Here's how it generally breaks down:

• Lightning is responsible for about 45% of Canada's wildfires, but because those fires often start in remote forests and can burn for days before anyone reaches them, they account for around 80% of the total area burned.
• Human activity starts slightly more than half of the fires by number. These are usually closer to roads and communities, so they're often detected and extinguished before they become massive.

Human-caused fires include:

• Unattended campfires
• Equipment sparks (ATVs, chainsaws, logging equipment)
• Vehicles with hot exhausts igniting dry grass
• Power lines
• Debris burning
• Fireworks
• Arson (a relatively small percentage)

One thing that's important to understand is that dry weather doesn't start fires—it makes them much easier to spread. A forest doesn't spontaneously combust because it's hot. There still has to be an ignition source, such as lightning or a spark from human activity.

Another factor is the sheer size of Canada. Much of northern Canada is sparsely populated, so when lightning ignites a fire in a remote boreal forest, firefighters may not even try to extinguish it immediately if it isn't threatening people or infrastructure. Some of these fires are allowed to burn because:

• they're hundreds of miles from towns,
• they're a natural part of the forest ecosystem,
• and it's often impossible or unsafe to fight every remote fire.

Those remote fires can grow into enormous "megafires," producing the smoke that eventually reaches Pennsylvania.

A common question is whether arson is behind most of these fires. The evidence does not support that. While some fires are intentionally set and are investigated as criminal acts, the overwhelming majority are attributed either to lightning or to accidental human causes such as equipment, campfires, and other unintentional ignitions.

So the reason you're seeing more smoke isn't necessarily because there are many more people setting fires. It's mainly that once a fire starts—especially a lightning-caused one—the forests have often been hot and dry enough for it to become much larger than similar fires would have decades ago, resulting in far more smoke being carried south by the prevailing winds. 

Then I asked: If the smoke is a health hazard, why isn't Canada trying to prevent the fires from growing so large?

This is actually a major debate within Canada. The answer is they do try—but there are practical, ecological, and economic limits to what they can do.

Here are the biggest reasons:

1. Canada is enormous.

Canada has about 347 million hectares (857 million acres) of forest—more forest than any country except Russia and Brazil.

Many fires start hundreds of miles from the nearest town. Sometimes it takes firefighters hours just to reach the area by aircraft, and there may be no roads at all.

2. They prioritize protecting people.

Canadian wildfire agencies use a strategy called values at risk.

That means they focus their resources on:

• towns and cities,
• Indigenous communities,
• highways,
• power lines,
• mines,
• oil and gas infrastructure,
• and other important facilities.

A fire burning in remote wilderness may simply be monitored if it's not threatening anyone. That's because there are only so many crews, aircraft, and bulldozers available.

3. Some fires are considered part of a healthy forest.

The Canadian boreal forest evolved with fire.

Natural fires:

• clear dead vegetation,
• recycle nutrients,
• create habitat for wildlife,
• help some tree species reproduce.

For many decades, land managers believed suppressing every fire could actually make future fires worse by allowing fuels to accumulate.

4. Once a fire becomes very large, it can become nearly impossible to stop.

This surprises many people.

A large wildfire can:

• create its own wind,
• throw burning embers more than a mile ahead,
• generate towering smoke clouds that produce lightning,
• spread faster than firefighters can construct fire lines.

At that point, crews often shift from trying to extinguish the fire to protecting lives and property.

5. Resources are limited.

Even wealthy countries don't have enough firefighting capacity for every major fire.

During an extreme season, Canada may have:

• thousands of active fires,
• hundreds burning out of control,
• thousands of firefighters working simultaneously,
• assistance from the United States, Australia, New Zealand, South Africa, and Europe.

Despite that, demand can exceed available resources.

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Could Canada do more?

Many experts believe there are steps that could reduce the size and severity of future fires, including:

• more prescribed (controlled) burns during safe conditions,
• thinning forests near communities,
• expanding firefighting capacity,
• improving early detection with satellites, drones, and AI,
• increasing Indigenous-led forest management practices, which have a long history of using controlled fire to reduce fuel buildup.

These approaches can reduce risk in some areas, but they can't eliminate wildfires across millions of acres of remote forest.

What about the smoke affecting the U.S.?

This has become a growing international concern. Canadian officials recognize that wildfire smoke doesn't stop at the border—it can affect air quality across much of North America. However, from an operational standpoint, their first responsibility is to protect people and infrastructure within Canada. Smoke impacts in the United States are considered during coordination and forecasting, but they generally don't determine where firefighters are deployed.

So while it can seem like "just put the fires out before they get huge," the reality is that many of these fires are burning in vast, inaccessible forests under conditions where suppression is extremely difficult. The question of whether Canada should invest more in prevention, expand prescribed burning, or change its wildfire management strategy is an active topic of discussion among policymakers, scientists, and the public.

Why aren't they using drones to detect fires?

They are—but probably not to the extent many people imagine. In fact, drones are becoming an increasingly important tool in Canadian wildfire management, but they aren't yet a complete solution.

Here's what drones are currently used for:

• Detecting new fires after lightning storms or public reports.
• Mapping fire perimeters with high-resolution cameras.
• Using infrared cameras to locate hidden hot spots, even through smoke or at night.
• Assessing damage after a fire passes.
• Keeping firefighters safer by scouting dangerous areas instead of sending people in.

The question many people ask is: "Why not have drones constantly patrol the forests and catch every fire when it's tiny?" There are several challenges.

Canada's forests are unimaginably large

Canada has nearly 9 million square kilometers (about 3.5 million square miles) of land. Even if drones could fly continuously, it would take an enormous fleet, along with operators, maintenance, charging infrastructure, and reliable communications to monitor such a vast area.

Limited flight time

Most battery-powered drones fly for roughly 30–60 minutes before needing to recharge or swap batteries. Longer-endurance drones exist, but they are much more expensive and fewer in number.

Remote locations

Many fires begin far from roads or electrical infrastructure. Launching, recovering, charging, and maintaining drones in those locations can be difficult.

Weather and smoke

Strong winds, heavy smoke, rain, and thunderstorms—the same conditions that often accompany wildfires—can limit when and where drones can fly safely.

They already use multiple detection methods

Wildfire agencies combine:

• Fire lookout towers
• Public reports
• Aircraft patrols
• Lightning detection networks
• Satellite imagery
• Drones in selected areas

Each method has strengths and weaknesses, so they work together rather than relying on a single technology.

Could AI and drones improve things?

Many researchers think so. There is active work on systems where:

• satellites identify possible new fires,
• AI filters out false alarms,
• drones automatically fly to investigate,
• and firefighters receive near real-time information.

Some provinces are already testing versions of this approach, but scaling it across all of Canada's forests is a major technical and financial undertaking.

So your question is a reasonable one, and it's one that wildfire agencies are actively exploring. The technology exists and is improving rapidly. The main obstacles are less about whether drones can detect fires and more about how to deploy enough of them over one of the largest forested areas on Earth in a cost-effective and reliable way.