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A pre-print study from smoke researcher Marshall Burke and others shows how fires are eating into air quality gains.
The Greater Los Angeles area is awash in smoke and ash as multiple fires burn in and around the city. It’s too soon to assess the overall pollution impacts from this rare January event, but we know the smoke is filled with tiny particles known as PM2.5, one of the most pernicious public health villains, associated with increased risk of respiratory and heart disease and premature death.
Last year, the Environmental Protection Agency tightened the National Ambient Air Quality Standard for PM2.5 for the first time since 2012. The South Coast Air Quality District, which contains Los Angeles, is known for having some of the worst air quality in the country. State officials have already deemed it to be out of compliance — and that’s without even counting pollution from major wildfires. But new research raises questions about whether complying with the new standard will even be possible in many places due to the increasing frequency and severity of wildfires.
Marshall Burke, who published the not-yet-peer-reviewed findings in December, is a Stanford University researcher who has spent the past several years investigating how wildfires have affected PM2.5 exposure in the U.S. In a 2023 paper published in Nature, he and his co-authors found that over just six years, wildfire smoke eroded decades of air quality improvements throughout the country. The trend was particularly bad in Western states, of course — some of which saw more than half of their gains erased. The pre-print of the new paper updates those findings to include data from 2023. But it also goes deeper on what this means in light of the new air quality standards. The authors find that 34% of air monitoring stations registered PM2.5 above the regulatory limit because of smoke in at least one of the last five years.
Technically, wildfire smoke is completely unregulated. Jurisdictions can request to exclude “exceptional events,” such as days when PM2.5 spiked due to wildfire, from their calculations. But as the “smoke season” has grown longer and more places experience more days with degraded air quality due to smoke, local officials have not been requesting more exemptions. The researchers analyzed applications for exemptions since 2019, and found that they were more common on days with higher levels of wildfire smoke, but were still infrequent overall.
One reason might be that local pollution control officers don’t always recognize when smoke has pushed pollution over the limit on a particular day versus other factors. There is also a “substantial resource burden involved” in demonstrating the influence of wildfire smoke on ambient air quality, the paper says. Also, as smoke becomes more commonplace, it may be more difficult for officials to make the case that a given smoke event is “exceptional.”
In any case, if this low rate of applications for exemptions continues, many more regions may find themselves to be out of compliance with the new PM2.5 standard.
In the paper’s discussion section, the researchers posit that as wildfire smoke continues to get worse, either of two possible scenarios could play out. In the first, air quality districts affected by smoke get better at applying for exemptions and therefore achieve compliance with the Clean Air Act, even as local air quality and public health deteriorate. In the second, they find other ways to stay in compliance with the standards, such as by tightening pollution caps on power plants and factories. “Such mitigation could be cost effective in many regions where abatement costs remain low relative to the benefits of further air quality improvements,” the authors write, “but could become onerous if wildfire smoke concentrations continue to grow, as is expected under a warming climate.”
The first scenario is bleak, and the second comes with a pretty big caveat. But those aren’t the only options — we can also reduce the risk of wildfires with better land-use planning and management. Unfortunately, promising strategies like controlled burns can push PM2.5 levels over the standard, and those are not exempt from reporting the way that wildfires are — creating a perverse incentive not to do them.
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The Army Corps of Engineers, which oversees U.S. wetlands, halted processing on 168 pending wind and solar actions, a spokesperson confirmed to Heatmap.
UPDATE: On February 6, the Army Corp of Engineers announced in a one-sentence statement that it lifted its permitting hold on renewable energy projects. It did not say why it lifted the hold, nor did it explain why the holds were enacted in the first place. It’s unclear whether the hold has been actually lifted, as I heard from at least one developer who was told otherwise from the agency shortly after we received the statement.
The Army Corps of Engineers confirmed that it has paused all permitting for well over 100 actions related to renewable energy projects across the country — information that raises more questions than it answers about how government permitting offices are behaving right now.
On Tuesday, I reported that the Trump administration had all but paralyzed environmental permitting decisions on solar and wind projects, even for facilities constructed away from federal lands. According to an internal American Clean Power Association memo sent to the trade association’s members and dated the previous day, the Army Corps of Engineers apparatus for approving projects on federally shielded wetlands had come to a standstill. Officials in some parts of the agency have refused even to let staff make a formal determination as to whether proposed projects touch protected wetlands, I reported.
In a statement to me, the Army Corps has confirmed it has “temporarily paused evaluation on” 168 pending permit actions “focused on regulated activities associated with renewable energy projects.” According to the statement, the Army Corps froze work on those permitting actions “pending feedback from the Administration on the applicability” of an executive order Trump issued on his first day in office, “Unleashing American Energy,” and that the agency “anticipates feedback on or about” February 7 from administration officials.
While the statement demonstrates how vast the potential impacts to the renewables sector may be, it also leaves several important questions unanswered. It’s unclear whether each pending permit action that has been frozen applies to its own individual project, or whether some projects have more than one permit pending before the Army Corps, so it is still fuzzy precisely how many projects may be impacted. The Army Corps did not say whether that feedback would lead to the lifting of holds on permitting activity, nor did it explain why the holds were enacted in the first place.
Finally, there’s one big question that still needs answering: The executive order in question focuses on fossil fuel projects and says nothing about renewable energy — no mentions of “renewable,” no “solar,” no “wind.” Why did this order trigger a permitting freeze in the first place? This level of confusion and ambiguity is part and parcel with other statements in the ACP memo, including that guidance and agency perspectives have varied widely in recent weeks depending on who in the government is being asked.
Climate advocates are already pressing the panic button. “This is a 5 alarm fire alert. This could decimate all the clean energy we worked to pass under Biden,” Nick Abraham, state communications director for League of Conservation Voters, wrote on Bluesky in response to my reporting.
I asked the Army Corps for clarity on how the executive order led to a pause on their permitting activity, and we’ll update this story if we hear back.
The leaders of both countries reached deals with the U.S. in exchange for a 30-day reprieve on border taxes.
U.S. President Donald Trump and Mexican President Claudia Sheinbaum announced a month-long pause on across-the-board 25% tariff on Mexican goods imported into the United States that were to take effect on Tuesday.
In a post on Truth Social, Trump said that Sheinbaum had agreed to deploy 10,000 Mexican troops to the U.S.-Mexico border, “specifically designated to stop the flow of fentanyl, and illegal migrants into our Country.” Secretary of State Marco Rubio, Secretary of the Treasury Scott Bessent, and Secretary of Commerce Howard Lutnick will lead talks in the coming month over what comes next.
“I look forward to participating in those negotiations, with President Sheinbaum, as we attempt to achieve a ‘deal’ between our two Countries,” Trump wrote.
In her own statement, Sheinbaum said the U.S. had committed to work on preventing the trafficking of firearms into Mexico.
There has still been no pause on planned tariffs on Canadian imports, which would likely affect the flow of oil, minerals, and lumber, as well as possibly break automobile supply chains in the United States. Canadian leaders announced several measures to counter the tariffs at both the federal and provincial level.
Trump and Canadian Prime Minister Justin Trudeau have spoken today, and are scheduled to do so again this afternoon. Canadian officials are not optimistic, however, that they’ll be able to get a similar deal, a Canadian official told The New York Times.
UPDATE 4:55 p.m. ET: Trudeau announced that he had reached a similar deal that would stave off the imposition of tariffs for a month. Following a “good call” with Trump, Trudeau said in a post on X that he would deploy personnel and resources to his country’s southern border. “Nearly 10,000 frontline personnel are and will be working on protecting the border,” Trudeau wrote. He also said that Canada would have a “Fentanyl Czar” and would “launch a Canada- U.S. Joint Strike Force to combat organized crime, fentanyl and money laundering.”
PJM is projecting nearly 50% demand growth through the end of the 2030s.
The nation’s largest electricity market expects to be delivering a lot more power through the end of the next decade — even more than it expected last year.
PJM Interconnection, which covers some or all of 13 states (and Washington, D.C.) between Maryland and Illinois, released its latest long-term forecast last week, projecting that its summer peak demand would climb by almost half, from 155,000 megawatts in 2025 to around 230,000 in 2039.
The electricity market attributed the increased demand to “the proliferation of data centers, electrification of buildings and vehicles, and manufacturing,” and noted (not for the first time) that the demand surge comes at the same time many fossil fuel power plants are scheduled to close, especially coal plants. Already, some natural gas and even some coal plants in PJM andelsewhere that were scheduled to close have seen their retirement dates pushed out in order to handle forecast electricity demand.
This is just the latest eye-popping projection of forthcoming electricity demand from PJM and others — last year, PJM forecast summer peak demand of about 180,000 megawatts in 2035, a figure that jumped to around 220,000 megawatts in this year’s forecast.
While summer is typically when grids are most taxed due to heavy demand from air conditioning, as more of daily life gets electrified — especially home heating — winter demand is forecast to rise, too. PJM forecast that its winter peak demand would go from 139,000 megawatts in 2025, or 88% of the summer peak, to 210,000 megawatts in 2039, or 95% of its summer peak demand forecast for that year.
Systems are designed to accommodate their peak, but winter poses special challenges for grids. Namely, the electric grid can freeze, with natural gas plants and pipelines posing a special risk in cold weather — not to mention that it’s typically not a great time for solar production, either.
Aftab Khan, PJM’s executive vice president for operations, planning, and security, said in a statement Thursday that much of the recent demand increase was due to data centers growing “exponentially” in PJM’s territory.
The disparity between future demand and foreseeable available supply in the short term has already led to a colossal increase in “capacity” payments within PJM, where generators are paid to guarantee they’ll be able to deliver power in a crunch. These payments tend to favor coal, natural gas, and nuclear power plants, which can produce power (hopefully) in all weather conditions whenever it’s needed, in a way that variable energy generation such as wind and solar — even when backed up by batteries — cannot as yet.
Prices at the latest capacity auction were high enough to induce Calpine, the independent power company that operates dozens of natural gas power plants and recently announced a merger with Constellation, the owner of the Three Mile Island nuclear plant, to say it would look at building new power plants in the territory.
The expected relentless increase in power demand, power capacity, and presumably, profits for power companies, was thrown into doubt, however, when the Chinese artificial intelligence company DeepSeek released a large language model that appears to require far less power than state of the art models developed by American companies such as OpenAI. While the biggest stock market victim has been the chip designer Nvidia, which has shed hundreds of billions of dollars of market capitalization this week, a number of power companies including Constellation and Vistra are down around 10%, after being some of the best stock market performers in 2024.