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Experts explain what you can do about the smoke engulfing the East Coast and Midwest.
Canadian wildfire smoke has descended upon large swaths of the Midwest and Eastern United States this week, and as of publication tens of millions of Americans are living under air quality alerts warning them not to go outside. As my colleague Jeva Lange writes, the air in New York City today is reminiscent of a time before the Clean Air Act existed.
Wildfires, for the most part, have historically been the purview of the West; East Coasters, accustomed to hurricanes and blizzards, have mostly managed to avoid the fallout from forest fires. That’s not quite so true anymore, and this week’s smoke is a likely preview of how things will work in the future. So how should people react when smoke makes its way to their cities?
To find out, I called up two doctors from Harvard’s T.H. Chan School of Public Health: Francesca Dominici, professor of biostatistics, population, and data science; and Kimberly Humphrey, an emergency physician and a fellow at the school’s Center for Climate, Health, and the Global Environment. I spoke separately to Dominici and Humphrey; our conversations have been combined and edited for length and clarity.
Dominici: I think the way to think about it is not to be overly panicking, but maybe it’s a day to not spend hours outside exercising. For people that have compromised immune systems or existing respiratory or cardiovascular diseases, it would be good to limit outdoor exposure as much as possible. So don't panic but be cautious.
Humphrey: Smoke from wildfires is a complex mixture of things. The thing about wildfires is they can burn anything. If a house is burning, for example, you have really complex mixtures of whatever is in that house that’s going into the air.
The one that we really worry about is the fine particles, which are known as PM 2.5 (i.e. particles smaller than 2.5 micrometers). They’re very little particles that people breathe in which have really significant impacts on heart and lung function, particularly in people who have chronic health conditions. But the impacts are still significant for people who are healthy previously and have no underlying health problems. It can cause coughing, wheezing, difficulty breathing, eye irritation, and short-term issues with lung function, even in people who don’t have any previous problems with their lungs.
Dominici: It’s not like walking by, for example, a construction site. You can see that dust, and those are not small particles. Those are coarse particles that make you cough or sneeze or bring tears to your eyes. That’s actually good, because you’re basically filtering them out. But these small particles, you don’t feel them. They penetrate very deep into the lungs, and then they cause inflammation that makes our immune response less effective.
Dominici: We know that these exposures to high-level fine particulate matter have both an immediate effect and a very acute effect. So we see an increase in, for example, hospital admissions, which go up the same day and the day after. But there have also been lots of studies that have documented that this effect can last for a very long time. We see chronic effects including effects on cognitive function like an exacerbation of dementia and Alzheimer's disease.
Humphrey: The first thing we would say is stay inside, shut your windows, stay away from the smoke, maybe buy an air purifier, exercise indoors.
But one of the tricky things with giving this kind of advice is that wildfire smoke affects people who are from disadvantaged socioeconomic communities more predominantly. And those are often the people that can't do the things that we would recommend to protect their health. For instance, many people have to go out to work or may be sleeping rough or have housing insecurity, and they don't have access to well-structured houses that protect them against wildfire smoke. So there's a real inequity there about the ability for people to follow the advice to keep themselves safe.
Dominici: You can totally take your dog for a walk or your kid to the playground, but if your child has asthma that’s something to watch out for. Maybe don’t spend hours outside, and make sure you have their asthma medications. People with pre-existing conditions should contact their primary-care physicians and discuss if they should potentially change their medication dosage to make sure their exposure to smoke doesn’t exacerbate whatever problem they have.
Humphrey: We’re seeing health impacts at levels below what the EPA recommends as safe levels of PM 2.5 exposure, so when our apps say “sensitive people” it’s probably actually a message for all of us. It’s important, I think, for people who call themselves healthy to understand that you can be a marathon runner and any exposure to wildfire smoke is going to have some kind of impact on you.
Humphrey: It’s very similar to COVID, so cloth masks and surgical masks offer some protection, they’re better than nothing, but they’re not as good as N95 masks. We’d recommend a really high-quality mask like an N95 because it does filter out those very, very tiny particles and offers really good protection.
Humphrey: I think we have the tools. What’s missing is education. So many people have access to air quality data, it’s on an app or on the internet, but they need more education about what to do with it. I’m very, very concerned with the socioeconomic inequities in particular. It’s a lot of the same issues as COVID: All of these issues are really, really hard to solve but are part of this whole piece.
Dominici: In a certain way, COVID has been a wake-up call. We are much more cautious about what’s in our air. I think it’s always important to keep in mind that when we’re talking about the health effects, we have to really understand that they’re a manifestation of the climate crisis. It’s not something we’re going to see in the future. It’s something that’s happening right now.
Read more about wildfire smoke:
The World's Wildfire Models Are Getting Torched
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Kettle offers parametric insurance and says that it can cover just about any home — as long as the owner can afford the premium.
Los Angeles is on fire, and it’s possible that much of the city could burn to the ground. This would be a disaster for California’s already wobbly home insurance market and the residents who rely on it. Kettle Insurance, a fintech startup focused on wildfire insurance for Californians, thinks that it can offer a better solution.
The company, founded in 2020, has thousands of customers across California, and L.A. County is its largest market. These huge fires will, in some sense, “be a good test, not just for the industry, but for the Kettle model,” Brian Espie, the company’s chief underwriting officer, told me. What it’s offering is known as “parametric” insurance and reinsurance (essentially insurance for the insurers themselves.) While traditional insurance claims can take years to fully resolve — as some victims of the devastating 2018 Camp Fire know all too well — Kettle gives policyholders 60 days to submit a notice of loss, after which the company has 15 days to validate the claim and issue payment. There is no deductible.
As Espie explained, Kettle’s AI-powered risk assessment model is able to make more accurate and granular calculations, taking into account forward-looking, climate change-fueled challenges such as out-of-the-norm weather events, which couldn’t be predicted by looking at past weather patterns alone (e.g. wildfires in January, when historically L.A. is wet). Traditionally, California insurers have only been able to rely upon historical datasets to set their premiums, though that rule changed last year and never applied to parametric insurers in the first place.
“We’ve got about 70 different inputs from global satellite data and real estate ground level datasets that are combining to predict wildfire ignition and spread, and then also structural vulnerability,” Espie told me. “In total, we’re pulling from about 130 terabytes of data and then simulating millions of fires — so using technology that, frankly, wouldn’t have been possible 10 or maybe five years ago, because either the data didn’t exist, or it just wasn’t computationally possible to run a model like we are today.”
As of writing, it’s estimated that more than 2,000 structures have burned in Los Angeles. Whenever a fire encroaches on a parcel of Kettle-insured land, the owner immediately qualifies for a payout. Unlike most other parametric insurance plans, which pay a predetermined amount based on metrics such as the water level during a flood or the temperature during a heat wave regardless of damages, Kettle does require policyholders to submit damage estimates. The company told me that’s usually pretty simple: If a house burns, it’s almost certain that the losses will be equivalent to or exceed the policy limit, which can be up to $10 million. While the company can always audit a property to prevent insurance fraud, there are no claims adjusters or other third parties involved, thus expediting the process and eliminating much of the back-and-forth wrangling residents often go through with their insurance companies.
So how can Kettle afford to do all this while other insurers are exiting the California market altogether or pulling back in fire-prone regions? “We like to say that we can put a price on anything with our model,” Espie told me. “But I will say there are parts of the state that our model sees as burning every 10 to 15 years, and premiums may be just practically too expensive for insurance in those areas.” Kettle could also be an option for homeowners whose existing insurance comes with a very high wildfire deductible, Espie explained, as buying Kettle’s no-deductible plan in addition to their regular plan could actually save them money were a fire to occur.
But just because an area has traditionally been considered risky doesn’t mean that Kettle’s premiums will necessarily be exorbitant. The company’s CEO, Isaac Espinoza, told me that Kettle’s advanced modeling allows it to drill down on the risk to specific properties rather than just general regions. “We view ourselves as ensuring the uninsurable,” Espinoza said. “Other insurers just blanket say, we don’t want to touch it. We don’t touch anything in the area. We might say, ’Hey, that’s not too bad.’”
Espie told me that the wildly destructive fires in 2017 and 2018 “gave people a wake up call that maybe some of the traditional catastrophe models out there just weren’t keeping up with science and natural hazards in the face of climate change.” He thinks these latest blazes could represent a similar turning point for the industry. “This provides an opportunity for us to prove out that models built with AI and machine learning like ours can be more predictive of wildfire risk in the changing climate, where we’re getting 100 mile per hour winds in January.”
Everyone knows the story of Mrs. O’Leary’s cow, the one that allegedly knocked over a lantern in 1871 and burned down 2,100 acres of downtown Chicago. While the wildfires raging in Los Angeles County have already far exceeded that legendary bovine’s total attributed damage — at the time of this writing, on Thursday morning, five fires have burned more than 27,000 acres — the losses had centralized, at least initially, in the secluded neighborhoods and idyllic suburbs in the hills above the city.
On Wednesday, that started to change. Evacuation maps have since extended into the gridded streets of downtown Santa Monica and Pasadena, and a new fire has started north of Beverly Hills, moving quickly toward an internationally recognizable street: Hollywood Boulevard. The two biggest fires, Palisades and Eaton, remain 0% contained, and high winds have stymied firefighting efforts, all leading to an exceedingly grim question: Exactly how much of Los Angeles could burn. Could all of it?
“I hate to be doom and gloom, but if those winds kept up … it’s not unfathomable to think that the fires would continue to push into L.A. — into the city,” Riva Duncan, a former wildland firefighter and fire management specialist who now serves as the executive secretary of Grassroots Wildland Firefighters, an advocacy group, told me.
When a fire is burning in the chaparral of the hills, it’s one thing. But once a big fire catches in a neighborhood, it’s a different story. Houses, with their wood frames, gas lines, and cheap modern furniture, might as well be Duraflame. Embers from one burning house then leap to the next and alight in a clogged gutter or on shrubs planted too close to vinyl siding. “That’s what happened with the Great Chicago Fire. When the winds push fires like that, it’s pushing the embers from one house to the others,” Duncan said. “It’s a really horrible situation, but it’s not unfathomable to think about that [happening in L.A.] — but people need to be thinking about that, and I know the firefighters are thinking about that.”
Once flames engulf a block, it will “overpower” the capabilities of firefighters, Arnaud Trouvé, the chair of the Department of Fire Protection Engineering at the University of Maryland, told me in an email. If firefighters can’t gain a foothold, the fire will continue to spread “until a change in driving conditions,” such as the winds weakening to the point that a fire isn’t igniting new fuel or its fuel source running out entirely, when it reaches something like an expansive parking lot or the ocean.
This waiting game sometimes leads to the impression that firefighters are standing around, not doing anything. But “what I know they’re doing is they’re looking ahead to places where maybe there’s a park, or some kind of green space, or a shopping center with big parking lots — they’re looking for those places where they could make a stand,” Duncan told me. If an entire city block is already on fire, “they’re not going to waste precious water there.”
Urban firefighting is a different beast than wildland firefighting, but Duncan noted that Forest Service, CALFIRE, and L.A. County firefighters are used to complex mixed environments. “This is their backyard, and they know how to fight fire there.”
“I can guarantee you, many of them haven’t slept 48 hours,” she went on. “They’re grabbing food where they can; they’re taking 15-minute naps. They’re in this really horrible smoke — there are toxins that come off burning vehicles and burning homes, and wildland firefighters don’t wear breathing apparatus to protect the airways. I know they all have horrible headaches right now and are puking. I remember those days.”
If there’s a sliver of good news, it’s that the biggest fire, Palisades, can’t burn any further to the west, the direction the wind is blowing — there lies the ocean — meaning its spread south into Santa Monica toward Venice and Culver City or Beverly Hills is slower than it would be if the winds shifted. The westward-moving Santa Ana winds, however, could conceivably fan the Eaton fire deeper into eastern Los Angeles if conditions don’t let up soon. “In many open fires, the most important factor is the wind,” Trouvé explained, “and the fire will continue spreading until the wind speed becomes moderate-to-low.”
Though the wind died down a bit on Wednesday night, conditions are expected to deteriorate again Thursday evening, and the red flag warning won’t expire until Friday. And “there are additional winds coming next week,” Kristen Allison, a fire management specialist with the Southern California Geographic Area Coordination Center, told me Wednesday. “It’s going to be a long duration — and we’re not seeing any rain anytime soon.”
Editor’s note: Firefighting crews made “big gains” overnight against the Sunset fire, which threatened famous landmarks like the TLC Chinese Theater and the Dolby Theatre, which will host the Academy Awards in March. Most of the mandatory evacuation notices remaining in Hollywood on Thursday morning were out of precaution, the Los Angeles Times reported. Meanwhile, the Palisades and Eaton fires have burned a combined 27,834 acres, destroyed 2,000 structures, killed at least five people, and remain unchecked as the winds pick up again. This piece was last updated on January 9 at 10:30 a.m. ET.
On greenhouse gases, LA’s fires, and the growing costs of natural disasters
Current conditions: Winter storm Cora is expected to disrupt more than 5,000 U.S. flights • Britain’s grid operator is asking power plants for more electricity as temperatures plummet • Parts of Australia could reach 120 degrees Fahrenheit in the coming days because the monsoon, which usually appears sometime in December, has yet to show up.
The fire emergency in Los Angeles continues this morning, with at least five blazes raging in different parts of the nation’s second most-populated city. The largest, known as the Palisades fire, has charred more than 17,000 acres near Malibu and is now the most destructive fire in the county’s history. The Eaton fire near Altadena and Pasadena has grown to 10,600 acres. Both are 0% contained. Another fire ignited in Hollywood but is reportedly being contained. At least five people have died, more than 2,000 structures have been destroyed or damaged, 130,000 people are under evacuation warnings, and more than 300,000 customers are without power. Wind speeds have come down from the 100 mph gusts reported yesterday, but “high winds and low relative humidity will continue critical fire weather conditions in southern California through Friday,” the National Weather Service said.
Apu Gomes/Getty Images
As the scale of this disaster comes into focus, the finger-pointing has begun. President-elect Donald Trump blamed California Gov. Gavin Newsom, suggesting his wildlife protections have restricted the city’s water access. Many people slammed the city’s mayor for cutting the fire budget. Some suspect power lines are the source of the blazes, implicating major utility companies. And of course, underlying it all, is human-caused climate change, which researchers warn is increasing the frequency and severity of wildfires. “The big culprit we’re suspecting is a warming climate that’s making it easier to burn fuels when conditions are just right,” said University of Colorado fire scientist Jennifer Balch.
America’s greenhouse gas emissions were down in 2024 compared to 2023, but not by much, according to the Rhodium Group’s annual report, released this morning. The preliminary estimates suggest emissions fell by just 0.2% last year. In other words, they were basically flat. That’s good news in the sense that emissions didn’t rise, even as the economy grew by an estimated 2.7%. But it’s also a little worrying given that in 2023, emissions dropped by 3.3%.
Rhodium Group, EPA
The transportation, power, and buildings sectors all saw upticks in emissions last year. But there are some bright spots in the report. Emissions fell across the industrial sector (down 1.8%) and oil and gas sector (down 3.7%). Solar and wind power generation surpassed coal for the first time, and coal production fell by 12% to its lowest level in decades, resulting in fewer industrial methane emissions. Still, “the modest 2024 decline underscores the urgency of accelerating decarbonization in all sectors,” Rhodium’s report concluded. “To meet its Paris Agreement target of a 50-52% reduction in emissions by 2030, the U.S. must sustain an ambitious 7.6% annual drop in emissions from 2025 to 2030, a level the U.S. has not seen outside of a recession in recent memory.”
Insured losses from natural disasters topped $140 billion last year, up significantly from $106 billion in 2023, according to Munich Re, the world’s largest insurer. That makes 2024 the third most expensive year in terms of insured losses since 1980. Weather disasters, and especially major U.S. hurricanes, accounted for a large chunk ($47 billion) of these costs: Hurricanes Helene and Milton were the most devastating natural disasters of 2024. “Climate change is taking the gloves off,” the insurer said. “Hardly any other year has made the consequences of global warming so clear.”
Munich Re
A new study found that a quarter of all the world’s freshwater animals are facing a high risk of extinction due to pollution, farming, and dams. The research, published in the journal Nature, explained that freshwater sources – like rivers, lakes, marshes, and swamps – support over 10% of all known species, including fish, shrimps, and frogs. All these creatures support “essential ecosystem services,” including climate change mitigation and flood control. The report studied some 23,000 animals and found about 24% of the species were at high risk of extinction. The researchers said there “is urgency to act quickly to address threats to prevent further species declines and losses.”
A recent oil and gas lease sale in Alaska’s Arctic National Wildlife Refuge got zero bids, the Interior Department announced yesterday. This was the second sale – mandated by Congress under the 2017 Tax Act – to generate little interest. “The lack of interest from oil companies in development in the Arctic National Wildlife Refuge reflects what we and they have known all along – there are some places too special and sacred to put at risk with oil and gas drilling,” said Acting Deputy Secretary Laura Daniel-Davis. President-elect Donald Trump has promised to open more drilling in the refuge, calling it “the biggest find anywhere in the world, as big as Saudi Arabia.”
“Like it or not, addressing climate change requires the help of the wealthy – not just a small number of megadonors to environmental organizations, but the rich as a class. The more they understand that their money will not insulate them from the effects of a warming planet, the more likely they are to be allies in the climate fight, and vital ones at that.” –Paul Waldman writing for Heatmap