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“I pulled the data for the past 18 years, and it’s almost off the charts.”
Air pollution in New York and across the eastern United States, driven by an outbreak of wildfires across Quebec and Nova Scotia, has reached the worst level since 2005, when modern records began, according to a Stanford economist.
“I pulled the data for the past 18 years, and it’s almost off the charts,” Marshall Burke, an economist who specializes in climate change and an associate professor at the Stanford Doerr School of Sustainability, told me.
Surveying the dangerous haze that stretched across the country on Tuesday, he said it could conceivably be one of the worst days for air pollution even before the 2000s. Rarely have so many people been exposed to so much particulate matter, or PM2.5, a toxic haze of microscopic soot and ash that is linked to early death and can penetrate the blood-brain barrier. (It’s called PM2.5 because it measures 2.5 or fewer microns across.)
New York City’s air pollution index — which spiked to more than 200 on Tuesday, a level considered “very unhealthy” for all groups — was comparable to a “pretty bad event that we’d get on the West Coast,” he said. But it is unheard of for such toxic air to afflict such a densely populated part of the country. In the late evening, New York briefly had the worst air quality of any city on Earth, beating Delhi, India, and Doha, Qatar.
Burke has published widely on climate change’s costs, studying how rising temperatures might affect crop yields, suicide, and the outbreak of wars. But on Tuesday evening, he said that the economic impacts of wildfires — and their voluminous smoke output — might be one of the biggest unknown dangers of climate. Our conversation also touched on the heinous health effects of wildfire smoke, especially for women and children. It has been edited and condensed for clarity and readability.
That’s a great question. We’ll have to see how long it lasts. A lot of the West in 2020 — really, in California — basically had what you guys are having but for a month. Sometimes it wasn’t quite as acute, but often we got days and days of stuff about as bad as what you guys are having. So I think it’s a hopefully very short-run vision of what some of the rest of the country has dealt with.
But the important part here is the number of people getting exposed. You get days in the West where, like, Missoula, Montana, is hit pretty hard. Or in the 2020 event, we had parts of California get hit pretty hard for weeks. But today we’re talking about the most populated parts of the country just getting hammered. So in that sense, it’s pretty anomalous — it’s different from the Western events where you have unpopulated areas getting dosed.
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People have been studying the health impacts of wildfire smoke for a while — and it’s interesting. You would think we would have a pretty precise answer, but we still don't have a great one.
That’s mainly because these levels of air pollution are so high they induce some weird behaviors. So people actually notice the smoke, and they respond in a way that shapes health outcomes.
So you see some things you would expect. Respiratory hospitalizations or emergency department visits go way up — that’s been shown by a lot of groups. And that’s caused by asthma, that’s COPD, that’s bad stuff.
But other stuff changes — car wrecks go down, there are fewer fractures, people don’t break their legs playing soccer. Basically, what economists would call avoidance behavior pushes back in the other direction pretty substantially. So on really bad days, it’s this funny mix of worsened respiratory outcomes and declines in other, “non-smoke-related” visits.
That said, there are demonstrable negative health impacts for vulnerable groups. And all the research suggests we should draw the circle wider and wider in terms of what we call “vulnerable groups.”
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. We see very large impacts on preterm birth for moms who are exposed while their kids were in utero. Like I said, my daughter has asthma, so on days like this, she gets to blow it out on the iPad sitting next to the air filter.
So part of the story is not nuanced. If you’re a vulnerable group, it’s a good time to protect yourself.
There is also an ongoing debate about whether wildfire-sourced PM2.5 is better, worse, or the same as PM2.5 from fossil fuel combustion. Some early evidence suggests it’s maybe a lot worse for respiratory function — I’m not fully convinced myself but it could be true. We see a lot of nasty stuff in wildfire smoke. We see heavy metals that get aerosolized, all this stuff that’s in your sink when houses burn, that gets aerosolized. But I think broadly, the PM2.5 literature is a good guide for what’s happening.
For me, it's so important to mention the backdrop, which is just this remarkable policy success in improving air quality. And it was driven by bipartisan public policy that was really good and really worked. You can look at papers on this: You just don’t get bad air-pollution days anymore on the East Coast. They’re gone. They just don’t exist.
Yeah, the Clean Air Act, exactly. And that is being so quickly undone in the West by wildfires. Less so in the East — we saw fingerprints of it last year — but this is going to be a big event, and it’s going to change our estimates a lot. So this really nice progress that we had made is just being rapidly eroded now, and I thought that was just a West Coast story, but maybe now it’s happening in the East too.
Now, I don’t think this is going to happen every year for you guys on the East Coast. I don’t think the data suggests that yet. But it’s not going to happen never — it’s going to be more common.
They were never going to originate in the East Coast, almost surely. Wildfire smoke might affect the East Coast, but it was going to come from somewhere else.
Exactly. And I think honestly that’s what you should still expect. Although the forecast for the next couple of days suggests there’s pretty high fire risk across a bunch of the Northeast, so it’s not out of the question. We could see some starts in the Northeast that could contribute to the smoke, but certainly that's not the case right now.
I think that the modal case is going to be one that looks a lot more like what we’re seeing today, where you get big Canadian fires blowing in. But that just makes the air-pollution problem harder, because now we have a transboundary problem.
So what do we do? Do we sue the Canadians? Do we buy them off?
The way I think about it is that the Clean Air Act was built on one main fact, which is that local pollution concentrations depend on local emissions. So if you regulate local emissions, you improve local air quality. And that worked really well for a while.
But that logic no longer holds. Look at the Canadian fires — number one, it's not a point source, and number two, it doesn't stay locally. We’re not equipped to deal with this, and we have dug ourselves a massive hole in terms of a century of putting out fires that have just made this problem a monster.
My pitch for a while on the West Coast has been that wildfire smoke is going to be one of the main — if not the main way — we encounter climate change viscerally. I'm sure it’s going to get hot, but these episodic events that sit with us and really disrupt our activity, this is going to be one of the most widespread ways we encounter it.
But I would not have told that story for you guys on the East Coast. And this is still one very historic event, so I’m not ready to tell that story, but I’m going to draw the boundary a little wider next time I give a talk on this.
That’s exactly right. None of the existing monetized economic costs of climate change — like when we come up with the social cost of carbon or any of that stuff — wildfires are not in there at all. So this is fully un-costed in all the sort of headline climate-change cost numbers that we have.
Certainly, folks are making the links, and if you read the National Climate Assessment then wildfires are in there, but in terms of monetizing the cost, you're 100% right. We have not done that. Honestly, this is a big push in my groups to try to do it back to that, try to monetize these, and I think they're going to be really big.
When we've done back of the envelope estimates, they suggest the costs are at least as large as heat, potentially. Especially if we get more events like the one today.
The effects go beyond that too. There are all these papers now that show cognitive decline when exposed to air pollution and wildfire smoke. We can look at test-score data and in smokier years, kids do worse on tests. The effects are individually small, but you add them up across schools and across counties and they get pretty big.
The question is, is there catchup, right? In terms of learning losses, we would have to follow people for longer than we’re able to right now. But they certainly last within the year. So if I’m exposed in September, and I take a test in April, I can still see the effects of the wildfire.
We see that in our data. Now, we can’t nail the cognitive channel [as being at fault here] — like, it could be because you didn't go to school. But mostly schools don't close during smoke events, and so it’s consistent with the cognitive channel. But maybe the next year you learn what you missed and, you know, we can’t rule that out.
I think the more proven long-term outcomes is the relationship between in utero exposure and later-in-life outcomes. That’s been shown for other air pollutants, and I don’t think there’s any reason to think it’s not true for wildfire as well. In-utero exposure has this lifelong, negative imprint, including on earnings and cognitive function.
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Imagine for a moment that you’re an aerial firefighter pilot. You have one of the most dangerous jobs in the country, and now you’ve been called in to fight the devastating fires burning in Los Angeles County’s famously tricky, hilly terrain. You’re working long hours — not as long as your colleagues on the ground due to flight time limitations, but the maximum scheduling allows — not to mention the added external pressures you’re also facing. Even the incoming president recently wondered aloud why the fires aren’t under control yet and insinuated that it’s your and your colleagues’ fault.
You’re on a sortie, getting ready for a particularly white-knuckle drop at a low altitude in poor visibility conditions when an object catches your eye outside the cockpit window: an authorized drone dangerously close to your wing.
Aerial firefighters don’t have to imagine this terrifying scenario; they’ve lived it. Last week, a drone punched a hole in the wing of a Québécois “super soaker” plane that had traveled down from Canada to fight the fires, grounding Palisades firefighting operations for an agonizing half-hour. Thirty minutes might not seem like much, but it is precious time lost when the Santa Ana winds have already curtailed aerial operations.
“I am shocked by what happened in Los Angeles with the drone,” Anna Lau, a forestry communication coordinator with the Montana Department of Natural Resources and Conservation, told me. The Montana DNRC has also had to contend with unauthorized drones grounding its firefighting planes. “We’re following what’s going on very closely, and it’s shocking to us,” Lau went on. Leaving the skies clear so that firefighters can get on with their work “just seems like a no-brainer, especially when people are actively trying to tackle the situation at hand and fighting to save homes, property, and lives.”
Courtesy of U.S. Forest Service
Although the super soaker collision was by far the most egregious case, according to authorities there have been at least 40 “incidents involving drones” in the airspace around L.A. since the fires started. (Notably, the Federal Aviation Administration has not granted any waivers for the air space around Palisades, meaning any drone images you see of the region, including on the news, were “probably shot illegally,” Intelligencer reports.) So far, law enforcement has arrested three people connected to drones flying near the L.A. fires, and the FBI is seeking information regarding the super soaker collision.
Such a problem is hardly isolated to these fires, though. The Forest Service reports that drones led to the suspension of or interfered with at least 172 fire responses between 2015 and 2020. Some people, including Mike Fraietta, an FAA-certified drone pilot and the founder of the drone-detection company Gargoyle Systems, believe the true number of interferences is much higher — closer to 400.
Law enforcement likes to say that unauthorized drone use falls into three buckets — clueless, criminal, or careless — and Fraietta was inclined to believe that it’s mostly the former in L.A. Hobbyists and other casual drone operators “don’t know the regulations or that this is a danger,” he said. “There’s a lot of ignorance.” To raise awareness, he suggested law enforcement and the media highlight the steep penalties for flying drones in wildfire no-fly zones, which is punishable by up to 12 months in prison or a fine of $75,000.
“What we’re seeing, particularly in California, is TikTok and Instagram influencers trying to get a shot and get likes,” Fraietta conjectured. In the case of the drone that hit the super soaker, it “might have been a case of citizen journalism, like, Well, I have the ability to get this shot and share what’s going on.”
Emergency management teams are waking up, too. Many technologies are on the horizon for drone detection, identification, and deflection, including Wi-Fi jamming, which was used to ground climate activists’ drones at Heathrow Airport in 2019. Jamming is less practical in an emergency situation like the one in L.A., though, where lives could be at stake if people can’t communicate.
Still, the fact of the matter is that firefighters waste precious time dealing with drones when there are far more pressing issues that need their attention. Lau, in Montana, described how even just a 12-minute interruption to firefighting efforts can put a community at risk. “The biggest public awareness message we put out is, ‘If you fly, we can’t,’” she said.
Fraietta, though, noted that drone technology could be used positively in the future, including on wildfire detection and monitoring, prescribed burns, and communicating with firefighters or victims on the ground.
“We don’t want to see this turn into the FAA saying, ‘Hey everyone, no more drones in the United States because of this incident,’” Fraietta said. “You don’t shut down I-95 because a few people are running drugs up and down it, right? Drones are going to be super beneficial to the country long term.”
But critically, in the case of a wildfire, such tools belong in the right hands — not the hands of your neighbor who got a DJI Mini 3 for Christmas. “Their one shot isn’t worth it,” Lau said.
Plus 3 more outstanding questions about this ongoing emergency.
As Los Angeles continued to battle multiple big blazes ripping through some of the most beloved (and expensive) areas of the city on Friday, a question lingered in the background: What caused the fires in the first place?
Though fires are less common in California during this time of the year, they aren’t unheard of. In early December 2017, power lines sparked the Thomas Fire near Ventura, California, which burned through to mid-January. At the time it was the largest fire in the state since at least the 1930s. Now it’s the ninth-largest. Although that fire was in a more rural area, it ignited for some of the same reasons we’re seeing fires this week.
Read on for everything we know so far about how the fires started.
Six major fires started during the Santa Ana wind event last week:
Officials are investigating the cause of the fires and have not made any public statements yet. Early eyewitness accounts suggest that the Eaton Fire may have started at the base of a transmission tower owned by Southern California Edison. So far, the company has maintained that an analysis of its equipment showed “no interruptions or electrical or operational anomalies until more than one hour after the reported start time of the fire.” A Washington Post investigation found that the Palisades Fire could have risen from the remnants of a fire that burned on New Year’s Eve and reignited.
On Thursday morning, Edward Nordskog, a retired fire investigator from the Los Angeles Sheriff’s Department, told me it was unlikely they had even begun looking into the root of the biggest and most destructive of the fires in the Pacific Palisades. “They don't start an investigation until it's safe to go into the area where the fire started, and it just hasn't been safe until probably today,” he said.
It can take years to determine the cause of a fire. Investigators did not pinpoint the cause of the Thomas Fire until March 2019, more than two years after it started.
But Nordskog doesn’t think it will take very long this time. It’s easier to narrow down the possibilities for an urban fire because there are typically both witnesses and surveillance footage, he told me. He said the most common causes of wildfires in Los Angeles are power lines and those started by unhoused people. They can also be caused by sparks from vehicles or equipment.
At more than 40,000 acres burned total, these fires are unlikely to make the charts for the largest in California history. But because they are burning in urban, densely populated, and expensive areas, they could be some of the most devastating. With an estimated 9,000 structures damaged as of Friday morning, the Eaton and Palisades fires are likely to make the list for most destructive wildfire events in the state.
And they will certainly be at the top for costliest. The Palisades Fire has already been declared a likely contender for the most expensive wildfire in U.S. history. It has destroyed more than 5,000 structures in some of the most expensive zip codes in the country. Between that and the Eaton Fire, Accuweather estimates the damages could reach $57 billion.
While we don’t know the root causes of the ignitions, several factors came together to create perfect fire conditions in Southern California this week.
First, there’s the Santa Ana winds, an annual phenomenon in Southern California, when very dry, high-pressure air gets trapped in the Great Basin and begins escaping westward through mountain passes to lower-pressure areas along the coast. Most of the time, the wind in Los Angeles blows eastward from the ocean, but during a Santa Ana event, it changes direction, picking up speed as it rushes toward the sea.
Jon Keeley, a research scientist with the US Geological Survey and an adjunct professor at the University of California, Los Angeles told me that Santa Ana winds typically blow at maybe 30 to 40 miles per hour, while the winds this week hit upwards of 60 to 70 miles per hour. “More severe than is normal, but not unique,” he said. “We had similar severe winds in 2017 with the Thomas Fire.”
Second, Southern California is currently in the midst of extreme drought. Winter is typically a rainier season, but Los Angeles has seen less than half an inch of rain since July. That means that all the shrubland vegetation in the area is bone-dry. Again, Keeley said, this was not usual, but not unique. Some years are drier than others.
These fires were also not a question of fuel management, Keeley told me. “The fuels are not really the issue in these big fires. It's the extreme winds,” he said. “You can do prescription burning in chaparral and have essentially no impact on Santa Ana wind-driven fires.” As far as he can tell, based on information from CalFire, the Eaton Fire started on an urban street.
While it’s likely that climate change played a role in amplifying the drought, it’s hard to say how big a factor it was. Patrick Brown, a climate scientist at the Breakthrough Institute and adjunct professor at Johns Hopkins University, published a long post on X outlining the factors contributing to the fires, including a chart of historic rainfall during the winter in Los Angeles that shows oscillations between wet and dry years over the past eight decades.
But climate change is expected to make dry years drier and wet years wetter, creating a “hydroclimate whiplash,” as Daniel Swain, a pre-eminent expert on climate change and weather in California puts it. In a thread on Bluesky, Swain wrote that “in 2024, Southern California experienced an exceptional episode of wet-to-dry hydroclimate whiplash.” Last year’s rainy winter fostered abundant plant growth, and the proceeding dryness primed the vegetation for fire.
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Editor’s note: This story was last update on Monday, January 13, at 10:00 a.m. ET.
On tough questioning from the Senate, LA’s fires, and EV leases
Current conditions: Odd weather has caused broccoli and cauliflower plants to come up far too early in the UK • Another blast of Arctic air is headed for the Midwest • An air quality alert has been issued in Los Angeles due to windblown dust and ash.
Firefighters in Los Angeles are scrambling to make progress against the ongoing wildfires there before dangerous winds return. The Palisades and Eaton fires have now been burning for almost a week, charring nearly 40,000 acres, damaging more than 12,000 structures, and leaving at least 24 people dead. They are 13% and 27% contained, respectively. Residents who lost their homes are desperately trying to find new properties to rent or buy in a tight market, with reports of intense bidding wars as landlords hike rents. The economic toll of this disaster is estimated to be between $135 billion and $150 billion. Red flag warnings are in effect today, with critical fire conditions and extreme wind gusts forecast through Wednesday.
Red fire retardant on pool furniture. Justin Sullivan/Getty Images
A few updates on the incoming administration: President-elect Donald Trump tapped Ed Russo to run an advisory environmental task force. Trump said Russo will oversee “initiatives to create great jobs and protect our natural resources, by following my policy of CLEAN AIR and CLEAN WATER. Together, we will achieve American Energy DOMINANCE, rebuild our Economy, and DRILL, BABY, DRILL.” Russo is a longtime Trump loyalist who served as an environmental consultant to the Trump Organization and wrote a book titled “Donald J. Trump: An Environmental Hero”.
Trump also announced his deputies for some key environmental and energy Cabinet positions over the weekend, including:
More than a dozen of Trump’s Cabinet nominees face Senate confirmation hearings this week. Doug Burgum, who is up for interior secretary, has a hearing before the Committee on Energy and Natural Resources tomorrow. Energy secretary nominee Chris Wright has one on Wednesday. EPA nominee Lee Zeldin has one with the Environment and Public Works Committee on Thursday.
Affordable EV leases are “the car market’s hottest deal,” according toThe Wall Street Journal. Car companies are changing the way they pitch EVs to buyers, offering short-term leases with low monthly payments. These deals are attractive to first-time EV shoppers who are still a little bit hesitant to commit, as well as people on a tighter budget. Roughly 45% of EV transactions at the end of 2024 were leases, much higher than the auto industry as a whole. And a provision in the Inflation Reduction Act means leased cars can more easily qualify for the government’s $7,500 EV tax credit. “The proliferation of lease deals has made EVs more accessible to buyers who couldn’t afford their higher sticker prices,” the Journal said. “For the automakers, it is helping get more EVs into customers’ hands after a choppy start for their electric-car operations.”
Wind power could overtake coal in Europe for electricity generation for the first time this year, according to the energy think tank Ember. At the end of 2024, wind power was closing in on coal, coming in at just 4% below the fossil fuel in power generation as the continent’s coal plants close. “That output gap could easily be made up over the course of 2025 by an increase in regional wind generation capacity or by higher average wind speeds at turbine level, or by some combination of both,” Reutersreported. Last year wind power accounted for 20% of electricity consumed in the EU, and the goal is to get that up to 50% by 2050. But as Electreknoted, the same problems plaguing projects in the U.S. – permitting delays and connection bottlenecks – are slowing things down. The EU accounts for 4.6% of global power sector emissions.
The World Health Organization’s European Centre for Environment and Health has issued a callout for “examples of interventions to protect and promote mental health in the face of climate change.” The group wants to take stock of these interventions so that it can identify gaps in mental health care and share some best practices. The callout is aimed at Europe only, but it is indicative of a growing awareness of how the worsening climate crisis is taking a toll on mental health worldwide.
“There’s a lot of finger-pointing going around, and I would just try to emphasize that this is a really complex problem. We have lots of different responsible parties. To me, what has happened requires more of a rethink than a blame game.” –Faith Kearns, a water and wildfire researcher at Arizona State University, speaking to Heatmap about the spread of misinformation around the LA fires