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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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On Venezuela’s oil, permitting reform, and New York’s nuclear plans
Current conditions: Cold temperatures continue in Europe, with thousands of flights canceled at Amsterdam Schiphol Airport, while Scotland braces for a winter storm • Northern New Mexico is anticipating up to a foot of snow • Australia continues to swelter in heat wave, with “catastrophic fire risk” in the state of Victoria.
The White House said in a memo released Wednesday that it would withdraw from more than 60 intergovernmental organizations, including the United Nations Framework Convention on Climate Change, the international climate community’s governing organization for more than 30 years. After a review by the State Department, the president had determined that “it is contrary to the interests of the United States to remain a member of, participate in, or otherwise provide support” to the organizations listed. The withdrawal “marks a significant escalation of President Trump’s war on environmental diplomacy beyond what he waged in his first term,” Heatmap’s Robinson Meyer wrote Wednesday evening. Though Trump has pulled the United States out of the Paris Agreement (twice), he had so far refused to touch the long-tenured UNFCCC, a Senate-ratified pact from the early 1990s of which the U.S. was a founding member, which “has served as the institutional skeleton for all subsequent international climate diplomacy, including the Paris Agreement,” Meyer wrote.
Among the other organizations named in Trump’s memo was the Intergovernmental Panel on Climate Change, which produces periodic assessments on the state of climate science. The IPCC produced the influential 2018 report laying the intellectual foundations for the goal of limiting global warming to 1.5 degrees Celsius above pre-industrial levels.
More details are emerging on the Trump administration’s plan to control Venezuela’s oil assets. Trump posted Tuesday evening on Truth Social that the U.S. government would take over almost $3 billion worth of Venezuelan oil. On Wednesday, Secretary of Energy Chris Wright told a Goldman Sachs energy conference that “going forward we will sell the production that comes out of Venezuela into the marketplace.” A Department of Energy fact sheet laid out more information, including that “all proceeds from the sale of Venezuelan crude oil and oil products will first settle in U.S. controlled accounts,” and that “these funds will be disbursed for the benefit of the American people and the Venezuelan people at the discretion of the U.S. government.” The DOE also said the government would selectively lift some sanctions to enable the oil sales and transport and would authorize importation of oil field equipment.
As I wrote for Heatmap on Monday, sanctions are just one barrier to oil development among a handful that would have to be cleared for U.S. oil companies to begin exploiting Venezuela’s vast oil resources.
In a Senate floor speech, Senator Martin Heinrich of New Mexico blasted the Trump administration’s anti-renewables executive actions, saying that the U.S. is “facing an energy crisis of the Trump administration’s own making,” and that “the Trump administration is dismantling the permitting process that we use to build new energy projects and get cheaper electrons on the grid.” Heinrich, a Democrat, is the ranking member of the Senate Committee on Energy and Natural Resources and a key player in any possible permitting reform bill. Though he said he supports permitting reform in principle, calling for “a system that can reliably get to a ‘yes’ or a ‘no’ on a permit in two to three years — not 10, not 17,” he said that “any permitting deal is going to have to guarantee that no administration of either party can weaponize the permitting process for cheap political points.” Heinrich called on Trump officials “to follow the law. They need to reverse their illegal stop work orders, and they need to start approving legally compliant energy projects.”
He did offer an olive branch to the Republican senators with whom he would have to negotiate on any permitting legislation, noting that “the challenge to doing permitting reform is not in this building,” specifying that Senators Mike Lee, chair of the ENR Committee, and Shelly Moore-Capito, chair of the Senate Committee on Environment and Public Works, have not been barriers to a deal. Instead, he said, “it is this Administration that is poisoning the well.”

The climate science nonprofit Climate Central released an analysis Thursday morning ranking 2025 “as the third-highest year (after 2023 and 2024) for billion-dollar weather and climate disasters — with 23 such events causing 276 deaths and costing a total of $115 billion in damages,” according to a press release.
Going back to 1980, the average number of disasters costing $1 billion or more to clean up was nine, with an average total bill of $67.9 billion. The U.S. hit that average within the first weeks of last year with the Los Angeles wildfires, which alone were responsible for over $61 billion in damages, the most economically damaging wildfire on record.
The New York Power Authority announced Wednesday that 23 “potential developers or partners,” including heavyweights like NextEra and GE Hitachi and startups like The Nuclear Company and Terra Power, had responded to its requests for information on developing advanced nuclear projects in New York State. Eight upstate communities also responded as potential host sites for the projects.
New York Governor Kathy Hochul said last summer that New York’s state power agency would go to work on developing 1 gigawatt of nuclear capacity upstate. Late last year, Hochul signed an agreement with Ontario Premier Doug Ford to collaborate on nuclear technology. Ontario has been working on a small modular reactor at its existing Darlington nuclear site, across Lake Ontario from New York.
“Sunrise Wind has spent and committed billions of dollars in reliance upon, and has met the requests of, a thorough review process,” Orsted, the developer of the Sunrise Wind project off the coast of New York, said in a statement announcing that it was filing for a preliminary injunction against the suspension of its lease late last year.
The move would mark a significant escalation in Trump’s hostility toward climate diplomacy.
The United States is departing the United Nations Framework Convention on Climate Change, the overarching treaty that has organized global climate diplomacy for more than 30 years, according to the Associated Press.
The withdrawal, if confirmed, marks a significant escalation of President Trump’s war on environmental diplomacy beyond what he waged in his first term.
Trump has twice removed the U.S. from the Paris Agreement, a largely nonbinding pact that commits the world’s countries to report their carbon emissions reduction goals on a multi-year basis. He most recently did so in 2025, after President Biden rejoined the treaty.
But Trump has never previously touched the UNFCCC. That older pact was ratified by the Senate, and it has served as the institutional skeleton for all subsequent international climate diplomacy, including the Paris Agreement.
The United States was a founding member of the UN Framework Convention on Climate Change. It first joined the treaty in 1992, when President George H.W. Bush signed the pact and lawmakers unanimously ratified it.
Every other country in the world belongs to the UNFCCC. By withdrawing from the treaty, the U.S. would likely be locked out of the Conference of the Parties, the annual UN summit on climate change. It could also lose any influence over UN spending to drive climate adaptation in developing countries.
It remains unclear whether another president could rejoin the framework convention without a Senate vote.
As of 6 p.m. Eastern on Wednesday, the AP report cited a U.S. official who spoke on condition of anonymity because the news had not yet been announced.
The Trump administration has yet to confirm the departure. On Wednesday afternoon, the White House posted a notice to its website saying that the U.S. would leave dozens of UN groups, including those that “promote radical climate policies,” without providing specifics. The announcement was taken down from the White House website after a few minutes.
The White House later confirmed the departure from 31 UN entities in a post on the social network X, but did not list the groups in question.
Bloom Energy is riding the data center wave to new heights.
Fuel cells are back — or at least one company’s are.
Bloom Energy, the longtime standard-bearer of the fuel cell industry, has seen its share of ups and downs before. Following its 2018 IPO, its stock price shot up to over $34 before falling to under $3 a share in October 2019, then soared to over $42 in the COVID-era market euphoria before falling again to under $10 in 2024. Its market capitalization has bounced up and down over the years, from an all time low of less than $1 billion in 2019 and further struggles in early 2020 after it was forced to restate years of earnings thanks to an accounting error after already struggling to be profitable, up again to more than $7 billion in 2021 amidst a surge of interest in backup power.
The stock began soaring (again) in the middle of last year as anything and everything plausibly connected to artificial intelligence was going vertical. Today, Bloom Energy is trading at more than $111 a share, with a market cap north of $26 billion — and that’s after a dramatic fall from its all-time high price of over $135 per share, reached in November. By contrast, Southwest Airlines is worth around $22 billion; Edison International, the parent company of Southern California Edison, is worth about $22.5 billion.
This is all despite Bloom recording regular losses according to generally accepted accounting principles, although its quarterly revenue has risen by over 50%, and its reported non-GAAP and adjusted margins and profits have grown considerably. The company has signed deals or deployed its fuel cells with Oracle, the utility AEP, Amazon Web Services, gas providers, the network infrastructure company Equinix, the real estate developer Brookfield, and the artificial intelligence infrastructure company CoreWeave, Bloom’s chief executive and founder, KR Sridhar, said in its October earnings call.
While fuel cells have been pitched for decades as a way to safely use hydrogen for energy, fuel cells can also run on natural gas or biogas, which the company has seized on as a way to ride the data center boom. Bloom leadership has said that the company will double its manufacturing capacity by the end of this year, which it says will “support” a projected four-fold annual revenue increase. “The AI build-outs and their power demands are making on-site power generated by natural gas a necessity,” Sridhar said during the earnings call.
To get a sense of how euphoric perception of Bloom Energy has been, Morgan Stanley bumped its price target from $44 dollars a share to $85 on September 16 — then just over a month later, bumped it again to $155, calling the company “one of our favorite ‘time to power’ stocks given its available capacity and near-term expansion plans.”
Bloom has also won plaudits from semiconductor and data center industry analysts. The research firm SemiAnalysis described Bloom’s fuel cells as a “a fairly niche solution [that] is now taking an increasingly large share of the pie.”
It’s been a long journey from green tech darling to AI infrastructure for Bloom Energy — and fuel cells as a technology.
Bloom was founded in 2001, originally as Ion America, and quickly attracted high profile Silicon Valley investors. By 2010, fuel cells (and Bloom) were still being pitched as the generation source of the future, with The New York Times reporting in 2010 that Bloom had “spent nearly a decade developing a new variety of solid oxide fuel cell, considered the most efficient but most technologically challenging fuel-cell technology.” That product launch followed some $400 million in funding, and Bloom would hit an almost $3 billion valuation in 2011.
By 2016, however, when the company first filed with the Securities and Exchange Commission to sell shares to the public, it was being described by the Wall Street Journal as “a once-ballyhooed alternative energy startup,” in an article that said the fuel cell industry had been an “elusive target for decades, with a succession of companies unable to realize its business potential.” The company finally went public in 2018 at a valuation of $1.6 billion.
Then came the AI boom.
Fuel cells don’t use combustion to generate power, instead combining oxygen ions with hydrogen from natural gas and generating emissions of carbon dioxide and water, albeit without the particulate pollution of other forms of fossil-fuel-based electricity generation. This makes the process of getting permits from the Environmental Protection Agency “significantly smoother and easier than that of combustion generators,” SemiAnalysis wrote in a report.
In today’s context, Bloom’s fuel cells are yet another on-site, behind-the-meter natural gas power solution for data centers. “The rapid expansion of AI data centers in the U.S. is colliding with grid bottlenecks, driving operators to adopt BTM generation for speed-to-power and resilience to their modularity, fast deployment, and ability to handle volatile AI workloads,” Jefferies analyst Dushyant Ailani wrote in a note to clients. “Natural gas reciprocating engines, Batteries, and Bloom fuel cells are emerging as a preferred solution due to their modularity, fast deployment, and ability to handle volatile AI workloads.”
SemiAnalysis estimates that capital expenditure for Bloom fuel cells are substantially higher than those for gas turbines on a kilowatt-hour basis — $3,000 to $4,000 for fuel cells, compared to between $1,500 and $2,500 for turbines. But where the company excels is in speed. “The big turbines are sold out for four or five years,” Maheep Mandloi, an analyst at Mizuho Securities, told me. “The smaller ones for behind the meter for one to two years. These guys can deliver, if needed, within 90 days.”
Like other data center-related companies, Bloom has faced some local opposition, though not a debilitating amount. In Hilliard, Ohio, the state siting board overrode concerns about the deployment of more than 200 fuel cells at an AWS facility.
Bloom is also far from the only company that has realigned itself to ride the AI wave. Caterpillar, which makes simple turbine systems largely for the oil and gas industry, has become a data center darling, while the major turbine manufacturers Mitsubishi, Siemens Energy, and GE Vernova have all seen dramatic increases in their stock price in the last year. Korean industrial conglomerate Doosan is now developing a new large-scale turbine. Even the supersonic jet startup Boom is developing a gas turbine for data centers.
While artificial intelligence — or at least artificial intelligence companies — promises unforeseen technological and scientific advancements, so far it’s being powered by the technological and scientific advancements of the past.