Sign In or Create an Account.

By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy

Climate

The 5 Big Questions About the 2023 Wildfire Smoke Crisis

We have answers.

A question mark amid a wildfire.
Heatmap Illustration/Getty Images

The eastern and northern United States are suffering under a hazy, poisonous cloud of wildfire smoke, produced by out-of-control forest fires in Quebec and Nova Scotia. The most toxic soot and ash are sitting virtually on top of North America’s most densely populated corridor, clouding the air in New York City; Toronto; Ottawa; Philadelphia, Washington, D.C.; and Norfolk, Virginia.

Air pollution alerts are in effect across the United States and Canada, affecting roughly 150 million people.

This is Heatmap’s set of commonly asked questions about the crisis. We’ll keep it updated throughout the event.

Why is it so smoky now?

Hundreds of wildfires have raged across northern Quebec for the past few weeks, driven by unusually warm and dry conditions.

Then on Monday, a low-pressure system surrounded by counterclockwise winds moved just off New England’s coast. Its strong, dry gusts fanned the flames in Canada, then pushed the resulting smoke and ash into the eastern United States.

Intense Canadian fires are unusual this early in the season, but the fires this year were fed by a warm spring and drought-like condition, Kent Moore, an atmospheric-physics professor at the University of Toronto, told me. Because the fires took hold before the vegetation could “green up” for the spring, the conflagrations grew more rapidly than they normally would, he said.

The dry conditions also helped the fires ignite the soil itself. “Because the soil was so dry — because of the dry winter and the dry spring — the fire got into the ground,” he said. “The vegetation below ground started to burn, and those are much harder to put out.”

How does the current crisis compare to previous events?

This is likely one of America’s worst days for air pollution in several decades, in terms of the number of people affected and the severity of the exposure, Marshall Burke, an economist and sustainability professor at Stanford, told me.

“It’s pretty off the chart,” Burke said. Wildfire smoke is affecting New York City much more acutely — and much earlier in the year — than it has at any time since 2006, when contemporary air-pollution data began to be kept.

What’s the connection between the 2023 Canadian wildfires and climate change?

It is difficult to attribute a single unprecedented event to climate change, and the climatology of wildfires in eastern North America is particularly challenging. (Climate change has more clearly worsened wildfires out West.) “This is probably an unlucky year for Canada, as far as wildfires go,” Moore, the atmospheric physicist, said.

But wildfires will become more likely across Canada as the climate changes, he said. And while climate change should broadly increase rainfall across Canada, it will also increase the likelihood of heat waves and more extreme spring and summer temperatures, which can make wildfires more likely.

“Nova Scotia has always had wildfires. It’s just they’ve had more wildfires this year than they have on average for the whole year,” he said. “There’s always going to be wildfires, but there’s going to be more of them.” As Canadian cities sprawl into previously uninhabited woodland areas, he added, the human impacts of wildfires will increase — even if the number and intensity of wildfires does not.

What should I do about the air pollution?

First, consult the air quality index at AirNow.gov. The AQI is a unit-less index of air quality running from zero to 500; any reading above 100 would rank as unusually polluted in the United States. On Wednesday afternoon, some air sensors in New York and New Jersey indicated that the AQI exceeded 400.

If it’s higher than 100, then the most vulnerable groups of people — including children, the elderly, anyone with a cardiopulmonary condition, and pregnant women — should limit strenuous activity outdoors. If higher than 150, then people should generally try to limit their outdoor activity; at levels above 200, the air is considered unhealthy and everyone should try to go outside as little as possible.

If you think you might be especially vulnerable, err on the side of caution. Recently, a body of new and large-scale studies have shown that air pollution is generally worse for the body and brain than previously thought.

Then, if you’re in an area with hazardous air pollution, consider how to limit your exposure to the air as much as possible. Keep your doors and windows closed. An air filter outfitted with a HEPA filter can improve the air in a home or apartment. It should generally be closer to the most sensitive people.

“Any pregnant moms — if my wife or anyone I knew was pregnant right now — I would be texting them to stay inside and sit by an air filter,” Burke told me. Exposure to severe air pollution during pregnancy has been shown to increase the risk of preterm birth, and it can reduce a child’s lifelong earnings, cognitive performance, and other indicators, he said.

A KN95 or N95 mask — the type of high-filtration mask used to prevent COVID infection — can also significantly limit your exposure to soot and ash. If you are in a sensitive group or are worried about air pollution’s health effects, you could consider wearing a mask inside if you have no other way to filter the air.

Get the best of Heatmap directly in your inbox:

* indicates required
  • Green

    You’re out of free articles.

    Subscribe today to experience Heatmap’s expert analysis 
of climate change, clean energy, and sustainability.
    To continue reading
    Create a free account or sign in to unlock more free articles.
    or
    Please enter an email address
    By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy
    AM Briefing

    Georgia on My Mind

    On electrolyzers’ decline, Anthropic’s pledge, and Syria’s oil and gas

    The Alabama statehouse.
    Heatmap Illustration/Getty Images

    Current conditions: Warmer air from down south is pushing the cold front in Northeast back up to Canada • Tropical Cyclone Gezani has killed at least 31 in Madagascar • The U.S. Virgin Islands are poised for two days of intense thunderstorms that threaten its grid after a major outage just days ago.

    THE TOP FIVE

    1. Alabama weighs scrapping utility commission elections after Democratic win in Georgia

    Back in November, Democrats swept to victory in Georgia’s Public Service Commission races, ousting two Republican regulators in what one expert called a sign of a “seismic shift” in the body. Now Alabama is considering legislation that would end all future elections for that state’s utility regulator. A GOP-backed bill introduced in the Alabama House Transportation, Utilities, and Infrastructure Committee would end popular voting for the commissioners and instead authorize the governor, the Alabama House speaker, and the Alabama Senate president pro tempore to appoint members of the panel. The bill, according to AL.com, states that the current regulatory approach “was established over 100 years ago and is not the best model for ensuring that Alabamians are best-served and well-positioned for future challenges,” noting that “there are dozens of regulatory bodies and agencies in Alabama and none of them are elected.”

    Keep reading...Show less
    Red
    Electric Vehicles

    Why the Electric Toyota Highlander Matters

    The maker of the Prius is finally embracing batteries — just as the rest of the industry retreats.

    The 2027 Highlander.
    Heatmap Illustration/Toyota, Getty Images

    Selling an electric version of a widely known car model is no guarantee of success. Just look at the Ford F-150 Lightning, a great electric truck that, thanks to its high sticker price, soon will be no more. But the Toyota Highlander EV, announced Tuesday as a new vehicle for the 2027 model year, certainly has a chance to succeed given America’s love for cavernous SUVs.

    Highlander is Toyota’s flagship titan, a three-row SUV with loads of room for seven people. It doesn’t sell in quite the staggering numbers of the two-row RAV4, which became the third-best-selling vehicle of any kind in America last year. Still, the Highlander is so popular as a big family ride that Toyota recently introduced an even bigger version, the Grand Highlander. Now, at last, comes the battery-powered version. (It’s just called Highlander and not “Highlander EV,” by the way. The Highlander nameplate will be electric-only, while gas and hybrid SUVs will fly the Grand Highlander flag.)

    Keep reading...Show less
    Green
    Energy

    Democrats Should Embrace ‘Cleaner’ LNG, This Think Tank Says

    Third Way’s latest memo argues that climate politics must accept a harsh reality: natural gas isn’t going away anytime soon.

    A tree and a LNG boat.
    Heatmap Illustration/Getty Images

    It wasn’t that long ago that Democratic politicians would brag about growing oil and natural gas production. In 2014, President Obama boasted to Northwestern University students that “our 100-year supply of natural gas is a big factor in drawing jobs back to our shores;” two years earlier, Montana Governor Brian Schweitzer devoted a portion of his speech at the Democratic National Convention to explaining that “manufacturing jobs are coming back — not just because we’re producing a record amount of natural gas that’s lowering electricity prices, but because we have the best-trained, hardest-working labor force in the history of the world.”

    Third Way, the long tenured center-left group, would like to go back to those days.

    Keep reading...Show less
    Green