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The finding by Stanford researchers confirms the danger — and lack of precedent — for the East Coast’s ongoing wildfire smoke crisis.
Wednesday, June 7, was by far the worst day for wildfire smoke exposure in American history, subjecting more people to greater amounts of soot and ash than any previous day on record, according to a new and rapid analysis conducted by Stanford researchers.
The finding confirms the danger — and lack of precedent — for the ongoing wildfire smoke crisis, which has smothered the northern and eastern United States in an acrid haze. Since Monday, a strong low-pressure system has fanned dozens of wildfires in northern Quebec, then blown the resulting smoke into North America’s most densely populated corridor, covering New York City, Philadelphia, Washington, D.C., and Toronto.
Even as the smoke moved in, it made history. Tuesday became the country’s third-worst day for wildfire smoke on record, according to research from the same Stanford team. Only two days in September 2020 — when vast wildfires sheathed California, Idaho, and the Pacific Northwest in smoke — had exposed more Americans to higher intensities of toxic particulate matter.
Wednesday smashed those records. By the late afternoon, New York and New Jersey’s sky had turned a pungent orange, and their air quality fell to “very unhealthy” or even “hazardous” levels for all groups, the worst category. The rest of the Northeast and Mid-Atlantic faced similar or only slightly better conditions, and wildfire smoke at least somewhat afflicted virtually everywhere between Minneapolis, Atlanta, and Boston.
Stanford.
The vast geographic sweep of the smoke — and the fact that it was so intense in the country’s biggest city — obliterated the old record. The country’s previous worst day for smoke exposure was September 13, 2020, when nearly 35 million Americans were exposed to more than 50 micrograms per cubic meter of microscopic soot and ash. That is five times worse than what the World Health Organization considers safe.
But on Wednesday, roughly 62 million Americans — nearly one in five — were exposed to such high levels of particulate matter.
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It was “just a massive, awful event, with highly populated areas getting hit with unprecedented levels of pollution,” Marshall Burke, an economist and professor at the Stanford Doerr School of Sustainability, said on Twitter. He leads the school’s Environmental Change and Human Outcomes Lab, which conducted the research.
The study encompassed data from 2006 to 2023. The researchers studied which days were worst on a population- and exposure-adjusted basis. In other words, on which days in history were the most Americans subjected to the most intense amounts of wildfire smoke?
Because the U.S. population has grown over time, and because wildfires have enlarged over the past few decades, it is unlikely that any days prior to 2006 saw so many Americans exposed to so much smoke. Most of the record days in the data set have happened since 2018.
With the new record in place, Tuesday falls to the fourth-worst day for wildfire smoke on record.
Speaking earlier this week, Burke said that what made this event so distinct from previous ones is that the wildfire smoke hit the country’s largest and most populated cities. “It’s mainly due to the East Coast having so many people. It’s New York, Boston, D.C., Detroit. Out West, our cities are just smaller,” he told me.
Read more about the wildfire smoke engulfing the East Coast:
Wednesday Was the Worst Day for Wildfire Pollution in U.S. History
The 5 Big Questions About the 2023 Wildfire Smoke Crisis
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The science is still out — but some of the industry’s key players are moving ahead regardless.
The ocean is by far the world’s largest carbon sink, capturing about 30% of human-caused CO2 emissions and about 90% of the excess heat energy from said emissions. For about as long as scientists have known these numbers, there’s been intrigue around engineering the ocean to absorb even more. And more recently, a few startups have gotten closer to making this a reality.
Last week, one of them got a vote of confidence from leading carbon removal registry Isometric, which for the first time validated “ocean alkalinity enhancement” credits sold by the startup Planetary — 625.6 to be exact, representing 625.6 metric tons of carbon removed. No other registry has issued credits for this type of carbon removal.
When the ocean absorbs carbon, the CO2 in the air reacts with the water to form carbonic acid, which quickly breaks down into hydrogen ions and bicarbonate. The excess hydrogen increases the acidity of the ocean, changing its chemistry to make it less effective at absorbing CO2, like a sponge that’s already damp. As levels of atmospheric CO2 increase, the ocean is getting more acidic overall, threatening marine ecosystems.
Planetary is working to make the ocean less acidic, so that it can take in more carbon. At its pilot plant in Nova Scotia, the company adds alkalizing magnesium hydroxide to wastewater after it’s been used to cool a coastal power plant and before it’s discharged back into the ocean. When the alkaline substance (which, if you remember your high school chemistry, is also known as a base) dissolves in the water, it releases hydroxide ions, which combine with and neutralize hydrogen ions. This in turn reduces local acidity and raises the ocean’s pH, thus increasing its capacity to absorb more carbon dioxide. That CO2 is then stored as a stable bicarbonate for thousands of years.
“The ocean has just got such a vast amount of capacity to store carbon within it,” Will Burt, Planetary’s vice president of science and product, told me. Because ocean alkalinity enhancement mimics a natural process, there are fewer ecosystem concerns than with some other means of ocean-based carbon removal, such as stimulating algae blooms. And unlike biomass or soil-related carbon removal methods, it has a very minimal land footprint. For this reason, Burt told me “the massiveness of the ocean is going to be the key to climate relevance” for the carbon dioxide removal industry as a whole.
But that’s no guarantee. As with any open system where carbon can flow in and out, how much carbon the ocean actually absorbs is tricky to measure and verify. The best oceanography models we have still don’t always align with observational data.
Given this, is it too soon for Planetary to issue credits? It’s just not possible right now for the startup — or anyone in the field — to quantify the exact amount of carbon that this process is removing. And while the company incorporates error bars into its calculations and crediting mechanisms, scientists simply aren’t certain about the degree of uncertainty that remains.
“I think we still have a lot of work to do to actually characterize the uncertainty bars and make ourselves confident that there aren’t unknown unknowns that we are not thinking about,” Freya Chay, a program lead at CarbonPlan, told me. The nonprofit aims to analyze the efficacy of various carbon removal pathways, and has worked with Planetary to evaluate and inform its approach to ocean alkalinity enhancement.
Planetary’s process for measurement and verification employs a combination of near field observational data and extensive ocean modeling to estimate the rate, efficiency, and permanence of carbon uptake. Close to the point where it releases the magnesium hydroxide, the company uses autonomous sensors at and below the ocean’s surface to measure pH and other variables. This real-time data then feeds into ocean models intended to simulate large-scale processes such as how alkalinity disperses and dissolves, the dynamics of CO2 absorption, and ultimately how much carbon is locked away for the long-term.
But though Planetary’s models are peer-reviewed and best in class, they have their limits. One of the largest remaining unknowns is how natural changes in ocean alkalinity feed into the whole equation — that is, it’s possible that artificially alkalizing the ocean could prevent the uptake of naturally occurring bases. If this is happening at scale, it would call into question the “enhancement” part of alkalinity enhancement.
There’s also the issue of regional and seasonal variability in the efficiency of CO2 uptake, which makes it difficult to put any hard numbers to the efficacy of this solution overall. To this end, CarbonPlan has worked with the marine carbon removal research organization [C]Worthy to develop an interactive tool that allows companies to explore how alkalinity moves through the ocean and removes carbon in various regions over time.
As Chay explained, though, not all the models agree on just how much carbon is removed by a given base in a given location at a given time. “You can characterize how different the models are from each other, but then you also have to figure out which ones best represent the real world,” she told me. “And I think we have a lot of work to do on that front.”
From Chay’s perspective, whether or not Planetary is “ready” to start selling carbon removal credits largely depends on the claims that its buyers are trying to make. One way to think about it, she told me, is to imagine how these credits would stand up in a hypothetical compliance carbon market, in which a polluter could buy a certain amount of ocean alkalinity credits that would then allow them to release an equivalent amount of emissions under a legally mandated cap.
“When I think about that, I have a very clear instinctual reaction, which is, No, we are far from ready,”Chay told me.
Of course, we don’t live in a world with a compliance carbon market, and most of Planetary’s customers thus far — Stripe, Shopify, and the larger carbon removal coalition, Frontier, that they’re members of — have refrained from making concrete claims about how their voluntary carbon removal purchases impact broader emissions goals. But another customer, British Airways, does appear to tout its purchases from Planetary and others as one of many pathways it’s pursuing to reach net zero. Much like the carbon market itself, such claims are not formally regulated.
All of this, Chay told me, makes trying to discern the most responsible way to support nascent solutions all the more “squishy.”
Matt Long, CEO and co-founder of [C]Worthy, told me that he thinks it’s both appropriate and important to start issuing credits for ocean alkalinity enhancement — while also acknowledging that “we have robust reason to believe that we can do a lot better” when it comes to assessing these removals.
For the time being, he calls Planetary’s approach to measurement “largely credible.”
“What we need to adopt is a permissive stance towards uncertainty in the early days, such that the industry can get off the ground and we can leverage commercial pilot deployments, like the one that Planetary has engaged in, as opportunities to advance the science and practice of removal quantification,” Long told me.
Indeed, for these early-stage removal technologies there are virtually no other viable paths to market beyond selling credits on the voluntary market. This, of course, is the very raison d’etre of the Frontier coalition, which was formed to help emerging CO2 removal technologies by pre-purchasing significant quantities of carbon removal. Today’s investors are banking on the hope that one day, the federal government will establish a domestic compliance market that allows companies to offset emissions by purchasing removal credits. But until then, there’s not really a pool of buyers willing to fund no-strings-attached CO2 removal.
Isometric — an early-stage startup itself — says its goal is to restore trust in the voluntary carbon market, which has a history of issuing bogus offset credits. By contrast, Isometric only issues “carbon removal” credits, which — unlike offsets — are intended to represent a permanent drawdown of CO2 from the atmosphere, which the company defines as 1,000 years or longer. Isometric’s credits also must align with the registry’s peer-reviewed carbon removal protocols, though these are often written in collaboration with startups such as Planetary that are looking to get their methodologies approved.
The initial carbon removal methods that Isometric dove into — bio-oil geological storage, biomass geological storage, direct air capture — are very measurable. But Isometric has since branched beyond the easy wins to develop protocols for potentially less permanent and more difficult to quantify carbon removal methods, including enhanced weathering, biochar production, and reforestation.
Thus, the core tension remains. Because while Isometric’s website boasts that corporations can “be confident every credit is a guaranteed tonne of carbon removal,” the way researchers like Chay and Long talk about Planetary makes it sound much more like a promising science project that’s being refined and iterated upon in the public sphere.
For his part, Burt told me he knows that Planetary’s current methodologies have room for improvement, and that being transparent about that is what will ultimately move the company forward. “I am constantly talking to oceanography forums about, Here’s how we’re doing it. We know it’s not perfect. How do we improve it?” he said.
While Planetary wouldn’t reveal its current price per ton of CO2 removed, the company told me in an emailed statement that it expects its approach “to ultimately be the lowest-cost form” of carbon removal. Burt said that today, the majority of a credit’s cost — and its embedded emissions — comes from transporting bases from the company’s current source in Spain to its pilot project in Nova Scotia. In the future, the startup plans to mitigate this by co-locating its projects and alkalinity sources, and by clustering project sites in the same area.
“You could probably have another one of these sites 2 kilometers down the coast,” he told me, referring to the Nova Scotia project. “You could do another 100,000 tonnes there, and that would not be too much for the system, because the ocean is very quickly diluted.”
The company has a long way to go before reaching that type of scale though. From the latter half of last year until now, Planetary has released about 1,100 metric tons of material into the ocean, which it says will lead to about 1,000 metric tons of carbon removal.
But as I was reminded by everyone, we’re still in the first inning of the ocean alkalinity enhancement era. For its part, [C]Worthy is now working to create the data and modeling infrastructure that startups such as Planetary will one day use to more precisely quantify their carbon removal benefits.
“We do not have the system in place that we will have. But as a community, we have to recognize the requirement for carbon removal is very large, and that the implication is that we need to be building this industry now,” Long told me.
In other words: Ready or not, here we come.
On mercury rising, climate finance, and aviation emissions
Current conditions: Tropical Storm Andrea has become the first named Atlantic storm of 2025 • Hundreds of thousands are fleeing their homes in southwest China as heavy rains cause rivers to overflow • It’s hot and humid in New York’s Long Island City neighborhood, where last night New York City mayoral candidate Zohran Mamdani delivered his victory speech after defeating former governor and longtime party power broker Andrew Cuomo in the race’s Democratic primary.
The brutal heat dome baking the eastern half of the United States continues today. Cooler weather is in the forecast for tomorrow, but this heat wave has broken a slew of temperature records across multiple states this week:
In Washington, D.C., rail temperatures reached a blistering 135 degrees, forcing the city’s Metro to slow down train service. Meanwhile, in New Jersey, the heat sickened more than 150 people attending a high school graduation ceremony. As power demand surged, the Department of Energy issued an energy emergency in the Southeast to “help mitigate the risk of blackouts.”
As Heatmap’s Matthew Zeitlin pointed out on Tuesday, in terms of what is on the grid and what is demanded of it, this may be the easiest summer for a long time. “Demands on the grid are growing at the same time the resources powering it are changing,” Zeitlin writes. “Electricity load growth is forecast to grow several percent a year through at least the end of the decade. At the same time, aging plants reliant on oil, gas, and coal are being retired (although planned retirements are slowing down), while new resources, largely solar and batteries, are often stuck in long interconnection queues — and, when they do come online, offer unique challenges to grid operators when demand is high.”
A group of 21 Democrat-led states including New Jersey, Massachusetts, New York, Arizona, and California, is suing the Trump administration for cutting billions of dollars in federal funding, including grants related to climate change initiatives. The lawsuit says federal agencies have been “unlawfully invoking a single subclause” to cancel grants that the administration deems no longer align with its priorities. The clause in question states that federal agencies can terminate grants “pursuant to the terms and conditions of the federal award, including, to the extent authorized by law, if an award no longer effectuates the program goals or agency priorities.” The states accuse the administration of leaning on this clause for “virtually unfettered authority to withhold federal funding any time they no longer wish to support the programs for which Congress has appropriated funding.”
The rollback has gutted projects across states and nonprofits that support diversity, equity, and inclusion, as well as climate change preparation programs and research. The states say the clause is being used unlawfully, and hope a judge agrees. “These cuts are simply illegal,” said New York Attorney General Letitia James. “Congress has the power of the purse, and the president cannot cut billions of dollars of essential resources simply because he doesn’t like the programs being funded.”
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A brief update from the Bonn Climate Change Conference in Germany: A group of 44 “Least Developed Countries” have called for rich countries to triple the financing goal for climate change adaptation by 2030 compared to 2022 levels. The current target sits at $40 billion a year by 2025, a number set back in 2021 at COP26. According toClimate Home News, tripling the financing goal on 2022 levels would bring in a little less than $100 billion annually. That’s far short of the $160 billion to $340 billion that the United Nations estimates will be needed by 2030. The Indian Express also reports that developing countries have “managed to force a reopening of discussions on the obligations of developed nations to ‘provide’ finance, and not just make efforts towards ‘mobilising’ financial resources, for climate action.” The issue will also be discussed at COP30 in Brazil later this year. The Bonn conference has been running since June 16 and ends tomorrow.
In the UK, aviation is now a bigger source of greenhouse gas emissions than the power sector, according to a new report from the Climate Change Committee. The independent climate advisors say that demand for leisure travel is boosting demand for international flights, and “continued emissions growth in this sector could put future targets at risk.” Meanwhile, the UK power sector has been rapidly decarbonizing, and is now the sixth largest source of emissions. (In the U.S., electricity production is the second-largest source of emissions, behind transportation.) The report also found that heat pump installations increased by 56% in 2024, and that nearly 20% of new vehicles sold were electric. UK emissions were down 50% last year compared to 1990.
The committee applauded the progress but urged more action from the government to cut electricity prices to help speed up the transition to clean technologies. “Our country is among a leading group of economies demonstrating a commitment to decarbonise society,” said Piers Forster, interim chair of the committee. “This is to be celebrated: delivering deep emissions reduction is the only way to slow global warming.”
Voters in North Carolina want Congress to leave the Inflation Reduction Act well enough alone, a new poll from Data for Progress finds. The survey, which asked North Carolina voters specifically about the clean energy and climate provisions in the bill, presented respondents with a choice between two statements: “The IRA should be repealed by Congress” and “The IRA should be kept in place by Congress.” (“Don’t know” was also an option.) The responses from voters broke down predictably along party lines, with 71% of Democrats preferring to keep the IRA in place compared to just 31% of Republicans, with half of independent voters in favor of keeping the climate law. Overall, half of North Carolina voters surveyed wanted the IRA to stick around, compared to 37% who’d rather see it go — a significant spread for a state that, prior to the passage of the climate law, was home to little in the way of clean energy development.
North Carolina now has a lot to lose with the potential repeal of the Inflation Reduction Act, as Heatmap’s Emily Pontecorvo has pointed out. The IRA brought more than 17,000 jobs to the state, along with $20 billion in investment spread out over 34 clean energy projects. Electric vehicle and charging manufacturers in particular have flocked to the state, with Toyota investing $13.9 billion in its Liberty EV battery manufacturing facility, which opened this past April.
As a fragile ceasefire between Israel and Iran takes hold, oil prices are now lower than they were before the conflict began on June 13.
Rob and Jesse talk with Michael Grunwald, author of the new book We Are Eating the Earth.
Food is a huge climate problem. It’s responsible for somewhere between a quarter and a third of global greenhouse gas emissions, but it concerns a much smaller share of global climate policy. And what policy does exist is often … pretty bad.
On this week’s episode of Shift Key, Rob and Jesse talk with Michael Grunwald, the author of the new book We Are Eating the Earth. It’s a book about land as much as it’s a book about food — because no matter how much energy abundance we ultimately achieve, we’re stuck with the amount of land we’ve got.
Grunwald is a giant of climate journalism and a Heatmap contributor, and he has previously written books about the Florida everglades and the Obama recovery act. Shift Key is hosted by Jesse Jenkins, a professor of energy systems engineering at Princeton University, and Robinson Meyer, Heatmap’s executive editor.
Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, YouTube, or wherever you get your podcasts.
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Here is an excerpt from our conversation:
Robinson Meyer: How did writing the book change how you, yourself, approached food — or you, yourself, eat? Do you find yourself eating less meat now? Do you find yourself eating less dairy?
Michael Grunwald: I cut out beef pretty early in my reporting. It became really obvious early on that beef is the baddie. I mean, if you’re a vegan, that’s amazing. That’s the best thing you can do from a climate perspective. If you’re vegetarian, that’s also great. But it turns out that cutting out beef is about as good as going vegetarian because vegetarians tend to eat more dairy, and cows are really the problem.
Beef is like, use 10 times more land and generate 10 times more emissions than chicken or pork. And yeah, chicken or pork are worse than beans and lentils. But I, like many people are weak. I’m a hypocrite. I feel like this stuff, it’s sort of like organized religion — you have to find the level of hypocrisy that you’re comfortable with. And I couldn’t justify continuing to eat beef while writing a book about how beef is really the problem, and we need to eat less beef and better beef.
But look, you know, our ancestors started eating meat 2 million years ago, and we’re really, I think, kind of hardwired to eat it. That said, I have stuck to it. I write in the book about how I did a bunch of reporting on cattle ranches in Brazil, and I spent two weeks sort of trying to think about how we could have better beef. And I did fall off the wagon during those two weeks because like, steak is delicious. People told me that, you know, Oh, if you’re still eating chicken and pork, after a month, you won’t even miss beef. And they lied. I still miss beef.
But look, I do think — and we can talk about this — I know in the climate world it’s become kind of uncool to talk about individual action. There’s this whole spate of stories about like, you know, I’m in the climate movement and I don’t care if you recycle, or veganism isn’t gonna save the world. But I honestly think, first of all, emissions are us. JBS and Donald Trump and McDonald’s are not forcing us to eat all this beef. These are decisions we make. Second of all, that if we do take this seriously as a climate crisis — I mean, it’s true. Policy is going to matter more. Corporate behavior is going to matter a lot. But individual emissions matter, too. And I don’t like the idea of people saying, like, Yeah, this is a horrible crisis, but also your emissions don’t matter.
I guess I understand enviros don’t want to sound like scolds. They used to have a bad reputation. But honestly, I think … well, now I think their reputation is for ineffectual rather than scoldy. And I think I liked it better when they were scoldy.
Mentioned:
Preorder We Are Eating the Earth
The real war on coal, by Michael Grunwald
The Senate GOP’s seismic overhaul of clean energy tax credits
Music for Shift Key is by Adam Kromelow.