Dozens of tents are seen on a lawn inside the Columbia University Campus after students refused to take down the encampment by the 2 p.m. EDT deadline given to students protesting by Columbia President Minouche Shafik.
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Luiz C. Ribeiro
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Tribune News Service/Getty Images
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Topline:
Students continue to protest at campuses across the country, despite the risk of arrest. Some schools now threaten demonstrators with disciplinary action, while others promise the opposite.
Why it matters: On Sunday, pro-Palestinian protesters and pro-Israeli protesters clashed at the University of California, Los Angeles, leading to what university leaders described as "physical altercations" and prompting them to increase security measures on campus.
Read more ... to see how campuses across the country are approaching this.
Pro-Palestinian demonstrators continue to turn out at schools across the country despite the risk of detention and suspension, with nearly 300 more protesters arrested over the weekend.
At Columbia University, where a pro-Palestinian encampment has catalyzed dozens of similar demonstrations across the nation, student protesters face threats of punishment, including suspension.
On Monday morning, Columbia University President Minouche Shafik announced that negotiations between faculty leaders and student organizers over the encampment were not able to reach an agreement and urged demonstrators to voluntarily disperse.
The university gave students until 2 p.m. ET to disperse and abandon the encampments or else face suspension pending further investigation, according to flyers it distributed on campus.
Students who voluntarily leave and sign a copy of a form committing to abide by university policies will be on academic probation through June 2025, according to the flyers. Those who remain past the deadline will be restricted from all Columbia campuses and property and ineligible to participate in classes and academic or extracurricular activities.
"You are not permitted to complete the Spring 2024 semester, including participate in classes or exams in-person or remotely or otherwise submit assignments or engage in any activities affiliated with Columbia University," the notice reads. "You may lose the semester. If you are scheduled to graduate, you are no longer eligible."
Dozens of New York police officers could be seen gathering outside the campus gates about an hour ahead of the deadline.
Many students remained despite the threats, saying they have no plans to leave unless the university meets its demand to divest from companies they say are aiding Israel's war in Gaza. After the flyers were distributed, Columbia Students for Justice in Palestine posted on X urging students not to sign anything.
Roughly 100 officers in uniform gathered at Columbia University's campus in the leadup to its 2 p.m. deadline for students to disperse from the encampment that's been up for nearly two weeks.
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"We will not be moved by these intimidation tactics. You can see the students are mobilized. There's hundreds of them here today. They will not be moved. We demand divestment, we will not be moved unless by force," Seuda Polat, a Columbia University graduate student, said during a press conference Monday.
Polat continued, "There has been no violence on this encampment. Students from diverse backgrounds have shared their religious observances together. We've celebrated Passover, we've celebrated shabbat twice. This is a place of community, of community learning, not violence."
Police continue to arrest protesters across the country
On Sunday, pro-Palestinian protesters and pro-Israeli protesters clashed at the University of California, Los Angeles, leading to what university leaders described as "physical altercations" and prompting them to increase security measures on campus.
At Virginia Tech University, police arrested scores of protesters in the early hours of Monday morning. Virginia Tech Police confirmed later that day that 91 people, including 54 current students, were arrested and charged with trespassing.
The school had warned of "heavy police activity around the Graduate Life Center" in a series of posts on X (formerly Twitter) starting just after 10 p.m. ET on Sunday, and announced around 3:30 a.m. that the incident "had stabilized." Social media footage shows protesters chanting at police as they lead people into multiple white vans.
Elsewhere in the state, 12 protesters — including nine students — were arrested at the University of Mary Washington on Saturday evening after refusing to vacate an encampment on its Fredericksburg, Va., campus. University President Troy Paino said in a statement that health and safety concerns had emerged on Saturday after protestors invited the off-campus public to join the encampment.
A man holds up a Palestinian flag as activists and students surround piled barricades at an encampment at at George Washington University early Monday.
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Kent Nishimura
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Meanwhile, protests at George Washington University in D.C. are stretching into their fifth day on Monday — the last day of class for the semester — after a tense weekend, culminating in a clash between protesters and police.
Students first set up an encampment on University Yard on Thursday and later launched a second one on nearby H Street after the school put up barricades to restrict access.
Shortly before midnight on Sunday, protesters knocked down the barricades — piling them in a stack in the middle of the lawn — and flooded the lawn, with people remaining there overnight in some 85 tents, the GW Hatchet reports.
GW officials said in a statement early Monday that a group of "approximately 200 protesters from across [D.C., Maryland and Virginia], including professional organizers, activists, and university students, have joined the unauthorized encampment on our campus."
"This is an egregious violation of community trust and goes far beyond the boundaries of free expression and the right to protest," they added. "The university will use every avenue available to ensure those involved are held accountable for their actions."
Schools are alternately threatening and disavowing disciplinary action
Students arrested at Emerson College last week won't face disciplinary action from the school, its president announced.
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Joseph Prezioso
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AFP via Getty Images
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One question on the minds of many is what, if any, disciplinary action student protesters might face from their schools, especially with finals and graduation fast approaching.
Some universities have suspended — or threatened to suspend — students who have been arrested for protesting, while others have said they will not.
Barnard College officials announced Friday that it will allow most of the 53 students who were arrested and suspended after protesting at Columbia University to return to campus. The New York Times reports that suspended students who reached agreements with the college have their access to residence halls, dining facilities and classrooms restored, while others are still working to reach agreements.
On Sunday, Jay Bernhardt, the president of Emerson College in Boston — where more than 100 protesters were arrested at an encampment early Thursday morning — said the college will not bring disciplinary charges against protesters, and will "encourage the district attorney not to pursue charges related to encampment violations."
He said it is also taking steps to support students who were arrested, including posting bail for them and providing housing support to those who are required to stay local for court appearances after the closing of their dorms.
"The College has done its best to keep all community members safe every day during these challenging times, but we recognize that we must do more," he added.
In Texas, the Travis County district attorney has dropped misdemeanor trespassing charges against all 57 people arrested during a protest at UT-Austin last week, after a judge found insufficient evidence to proceed.
Elsewhere, some schools are threatening disciplinary action for students who don't comply with directives to leave encampments that they say violate their policies.
Officials at the University of Florida, where students began protesting on Wednesday, said Friday that demonstrators could face suspension and a three-year ban from campus if they violate specific protest rules, reports member station WUFT.
They are prohibited from using bullhorns or speakers to amplify their voices, possessing weapons and protesting inside campus buildings — but also face more vague prohibitions like "no disruption," according to a list circulated late Thursday.
"They also included 'no sleeping' on a campus where students often doze in the sun between classes," per WUFT.
At Cal Poly Humboldt, officials closed campus to the public on Saturday, several days after student protesters first occupied two academic and administrative buildings. They had previously given protesters until 5 p.m. on Friday to leave with a guarantee of no immediate arrest — but said they would still face consequences.
"This does not, however, eliminate University conduct-related sanctions or legal implications," officials said in a release. "In addition, voluntarily departing in this way will be considered as a mitigating factor in University conduct processes and may reduce the severity of sanctions imposed."
The campus will remain closed until May 10, with work and classes remote through the end of the semester. Officials say they are planning for "various scenarios" for commencement.
At Massachusetts Institute of Technology, president Sally Kornbluth said in a Sunday message to students that their growing encampment violates policies around registering for campus demonstrations and creates a "potential magnet for disruptive outside protestors."
She said rules have been broken, and those who break them — "including rules around the time, place and manner of protest" — will face disciplinary action.
"We are open to further discussion about the means of ending the encampment," she added. "But this particular form of expression needs to end soon."
Some faculty are calling for amnesty
Students and faculty at some universities are calling on their administrations not to discipline protesters. Arrested protesters face uncertainty about not only their legal records but the status of campus housing, financial aid and graduation eligibility.
At the University of Pennsylvania, officials say a campus statue was vandalized with antisemitic graffiti and are calling on demonstrators — from Penn and other area schools — to disband.
A group of Penn faculty and Philadelphia-area elected officials signed a letter last week urging university leaders to "respect students' rights to engage in nonviolent protest" by refraining from calling in law enforcement to make arrests and from filing disciplinary and criminal charges against peaceful protesters at the encampment.
"Protesters nationwide face police violence and severe discipline, and the safety and wellbeing of Philadelphia students exercising their rights are among our foremost concerns," they wrote.
Nearly 300 faculty members at Yale University, where 48 protesters were arrested last week, signed a letter condemning what they called "the criminalization of Yale students engaged in recent acts of peaceful protest." They demanded that the university take no further disciplinary action and called on authorities to drop all charges against them.
They said the protesters arrested face Class A misdemeanors under Connecticut law, which carry possible penalties of up to 364 days in jail.
"Threatening students with sanctions of this kind is unconscionable and should not be the means by which Yale responds to peaceful protest," they added.
In a further sign of discontent, faculty members at universities in California, Georgia and Texas have either initiated or passed largely symbolic votes of no confidence in their leadership, according to the Associated Press.
People extract ballots from their envelopes and prepare them to be scanned for counting in the Vote-By-Mail Processing Boards area at the Orange County Registrar of Voters Facility in Santa Ana, Calif. on Oct. 28, 2026.
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Topline:
A federal judge has denied an unprecedented, emergency request by the Department of Justice to segregate thousands of California ballots in the midterm elections.
What the court said: In his 26-page ruling issued this evening, U.S. District Judge David Carter, a Clinton appointee, denied the Justice Department's request for a temporary restraining order to stop processing the ballots in question. "Never before in American history has the federal government, on the eve of an election, sought to coerce a state and local government to abandon their own Constitutional elections procedures and bend to the will of the Executive Branch," he wrote. Carter also expressed concern about taking action that could disenfranchise eligible voters and create chaos.
The backstory: The Justice Department wants California election officials to stop processing ballots pertaining to 20,000 individuals that federal officials say are "likely" noncitizens. State and local officials in California have countered that the DOJ’s list of “likely” noncitizens is unreliable, with a preliminary analysis by Los Angeles County showing that many on the list do not have active voter registrations.
What's next: The judge said that the federal government can address the issue by continuing to indict people for the crime of illegally voting as noncitizens. DOJ officials say in the last two months they have charged dozens of people for registering or voting without being a U.S. citizen.
A federal judge has denied an unprecedented, emergency request by the Department of Justice to segregate thousands of California ballots in the midterm elections.
The Justice Department wants California election officials to stop processing ballots pertaining to 20,000 individuals that federal officials say are "likely" noncitizens.
State and local officials in California have countered that the DOJ's list of "likely" noncitizens is unreliable, with a preliminary analysis by Los Angeles County showing that many on the list do not have active voter registrations. The officials also claim that setting aside ballots just days before Election Day, when voting and processing mailed ballots are already underway, would be unlawful and infeasible and would disenfranchise eligible voters.
In his 26-page ruling issued Wednesday evening, U.S. District Judge David Carter, a Clinton appointee, denied the Justice Department's request for a temporary restraining order to stop processing the ballots in question.
"Never before in American history has the federal government, on the eve of an election, sought to coerce a state and local government to abandon their own Constitutional elections procedures and bend to the will of the Executive Branch," he wrote.
Carter also expressed concern about taking action that could disenfranchise eligible voters and create chaos.
"Once a vote is segregated, lasting harm has occurred," Carter wrote at the conclusion of his order. "If the Executive can discount votes and threaten an ongoing election due to unproven allegations, then our democracy is in danger. This Court declines to be a party to such process."
The judge said that the federal government can address the issue by continuing to indict people for the crime of illegally voting as noncitizens. DOJ officials say in the last two months they have charged dozens of people for registering or voting without being a U.S. citizen.
The DOJ's lawsuit in California, which was filed Oct. 15, is among a flurry of unprecedented actions the department has waged in states close to Election Day, raising alarms about federal interference in state election procedures.
Like in California, on Monday federal prosecutors asked Washington state election officials to review a list of 400 registered voters the DOJ believes are likely noncitizens. And last week, the DOJ filed an unusual lawsuit in Alaska that seeks to stop the state from certifying the results in its Senate race if the Republican incumbent loses due to votes for a longshot candidate with a similar name who is accused of being a spoiler candidate.
In California's most recent motion to the court, state Attorney General Rob Bonta, a Democrat, asked the judge to take into account the circumstances of DOJ's demand. "This litigation is a precursor to further interference here in California," Bonta wrote. "The Court must not be drawn into this chilling degradation of democratic values and constitutional principles."
The Department of Justice is expected to appeal Carter's denial, and the matter could ultimately wind up before the U.S. Supreme Court.
The DOJ has argued the issue is urgent since ballots are already being processed. Once signatures are verified on returned mail ballot envelopes, the ballots are separated from their envelopes to retain voter confidentiality and it then becomes impossible to retrieve an ineligible ballot.
Federal prosecutors have argued that votes by noncitizens dilute the votes of U.S. citizens. Voting by noncitizens has been shown by audits and investigations to be extremely rare.
The accuracy of the DOJ's list of "likely" noncitizens is still an ongoing matter of dispute.
A Los Angeles County analysis of a small sample of people on the DOJ's list found that a significant portion had said in records they were born in the U.S. But U.S. Citizenship and Immigration Services senior official Nicolas Bartell contested that in recent court filings, writing that his office's review of those individuals found none were U.S.-born.
Bartell did acknowledge the review found four of those people "might have a claim to U.S. citizenship."
He also provided the court additional details about the federal government's methodology in creating the list in recent court filings.
But University of Delaware political scientist Kassra Oskooi, who has been tapped as an expert witness by voting rights groups who are intervening in the case, responded in his own declaration to the court that he believes USCIS's matching protocol "is likely to be unreliable."
Background: Last December, the CPUC awarded a grant to telecom company AVX Networks to install subsea fiber internet infrastructure between Orange County and the island.
Why it matters: Catalina Island is home to more than 4,000 residents, and it draws thousands of tourists each year, but the internet connection is often slow and unreliable. The lack of a reliable internet connection affects critical services on the island such as remote learning and emergency response.
The island is home to more than 4,000 residents, and it draws thousands of tourists each year. Its slow, unreliable internet connection affects everything from remote learning to emergency response.
Lance Ware is CEO of AVX Networks, the company awarded the grant from the CPUC in December 2025. He told LAist host Nereida Moreno that the island depends on a very limited wireless internet link.
“When the town is busy, for instance, a cruise ship comes … the internet just gets crippled along with all the telephone services,” Ware explained.
Months after AVX Networks was awarded the grant, CPUC staff accused the company in July 2026 of breaking federal spending rules, citing insufficient justification and documentation for invoices.
The proposed plan would build the fiber-optic network under the San Pedro Channel from two points on Catalina Island to landings near Huntington Beach. Those cables will then connect to the Middle Mile Broadband Network in Stanton.
Where do things stand today?
CPUC staff allege that AVX Networks violated several program requirements, according to records.
“Since the award, AVX Networks has not shown itself to have the requisite administrative, technical, and operational capacity to deliver on its project, and AVX Networks has failed to comply with the terms and conditions of its award,” the CPUC agenda item records state.
Ware said he “vehemently disagrees” with those statements.
“There are allegations on things in there that do not make sense to us in that we've had no due process or cure and correct period to address,” Ware said.
What’s next?
If the commission terminates the contract and pulls the funding, Ware said the project will be delayed, but not stopped.
“This is not curtains down for us,” Ware added. “It's gonna take longer, and we'll have to find some other way to finance it, but we certainly haven't given up.”
How to participate in CPUC meetings
California’s Public Utilities Commission meets on Thursday, Oct. 29 at 11 a.m. You can watch the meeting remotely here.
To make public comments over the phone: Call (800) 857-1917. When prompted by the operator, unmute your phone and press *1 (star one). You will be prompted to state your name and/or organization. The operator will call on you when it’s your turn to speak.
To make a written comment: You can submit comments on the CPUC docket page.
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Erin Rode
is working on election coverage this fall, along with other topics.
Published October 28, 2026 4:00 PM
More than 30 cities in L.A. and Orange counties have tax increases of some kind on the Nov. 3 ballot.
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Raymond Rivera
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Topline:
By LAist’s count, over 30 cities in Los Angeles and Orange counties are asking residents to approve tax measures on Election Day this Tuesday.
Why now? Municipalities cite stagnant revenues that haven’t kept pace with the rising costs of insurance, maintenance and infrastructure projects, and employee pensions. As a result, big cities, suburbs and small towns alike are all facing multimillion-dollar budget deficits. So they are asking residents to open their wallets — or potentially see deep cuts to basic city services.
Read on ... to find out if possible hikes are coming your way.
Southern Californians are feeling squeezed by the rising costs of, well, everything. And now their local governments are asking for more money, too.
By LAist’s count, more than 30 cities or districts in Los Angeles and Orange counties are asking residents to approve tax measures on Election Day, Nov. 3, citing stagnant revenues that haven’t kept pace with the rising costs of insurance, maintenance and infrastructure projects, and employee pensions. Big cities, suburbs and small towns are all facing multimillion-dollar budget deficits and asking residents to open their wallets — or potentially see deep cuts to basic city services.
The list of local measures on ballots from Culver City to San Clemente includes sales taxes, hotel taxes, business taxes, parcel taxes and utility taxes. Some ballot measures would extend or increase existing taxes while others are brand-new.
Much of the answer to why so many tax measures are on the ballot lies in Proposition 13, which capped property taxes in 1978.
Before Prop. 13, cities and counties relied on property taxes for nearly all of their revenue. In the decades since, they’ve increasingly turned to other types of taxes. Hotel and utility taxes, for example, were essentially nonexistent before the mid-1970s, and sales taxes represented a small sliver of revenue. Even as these taxes have grown, they’ve struggled to replace property tax revenue.
How Proposition 13 reshaped local taxes
Before 1978, California municipalities could raise taxes without voter approval. But in addition to capping property taxes, Proposition 13 also changed the rules for other taxes. Section 4 of Proposition 13 states that any special taxes (which are taxes designated for a specific use) must be approved by two-thirds of voters. A later proposition passed in 1986 requires that general taxes be approved by a simple majority of voters. General taxes are general purpose funds that cities can allocate as they please.
The rules could change again this year with Proposition 43, which would raise the share of votes needed to pass local special tax measures proposed by citizens to two-thirds. Currently, citizen-led special tax initiatives only need to win a simple majority.
Despite what the Nov. 3 ballot might suggest, sales tax measures are actually becoming less common, according to Michael Coleman, author of the California Local Government Finance Almanac. “More and more governments have started to exhaust the capacity for that. There’s a limit in how much you can do both legally and in terms of the tolerance of voters,” Coleman said.
State law caps the maximum combined local and county sales tax rate, and many Southern California cities are already at or near that cap, Coleman said. And sales tax isn’t as reliable as it used to be, amid the broader retail downturn and shift to a service-based economy (most services aren’t taxable in California).
All of that means cities are increasingly turning to “ticky-tacky, peculiar taxes” to come up with revenue, according to Kirk Stark, a professor of tax law and policy at UCLA.
The “conventional tax instruments” — property, income and sales taxes — are all limited by state law, Stark said. “Local governments that are hoping to satisfy demand for any kind of public expenditure have to turn to other, less conventional sources of revenue.”
This year, cities are asking Southern Californians to say yes to a wide range of taxes. Below, we look at three examples in South Gate, Orange and Diamond Bar.
South Gate: A utility users tax
South Gate is asking voters to approve something less common: a utility users tax, or UUT for short. If Measure SG is approved, the 8% tax would be added to bills for utilities such as electricity, water, natural gas, cable and phone service. The tax would bring in an estimated $10.4 million per year.
The city is facing a potential fiscal emergency and a $9.4 million budget deficit. Earlier this year, South Gate began cutting back services, including eliminating its crossing guard program and assigning fewer police officers per shift.
At a City Council meeting on the tax measure earlier this year, several residents spoke against the measure, with some calling the deficit a result of potential financial mismanagement that shouldn’t be pushed onto residents. Others said the monthly costs would simply add a new burden to already tight budgets.
“Being a homeowner here for the past 13 years, I have seen my utilities go up as well as the cost of living, my insurance for my house, and my car insurance go up. I believe there’s got to be a way to fix this problem without the UUT measure,” one resident told the City Council.
“I’m extremely frustrated that you now want to do electricity, water, sewer, cable, cell phone, gas. ... That hurts us. You’re passing that on to us, and that is absolutely not acceptable,” said another.
Most people don’t book a hotel in their own city. That’s made hotel taxes an easier pill to swallow for voters, since the tax is mostly levied on visitors.
The city of Orange is asking voters to approve Measure J, which wouldraise the hotel tax from 10% to 14%. Orange is one of 10 cities across Los Angeles and Orange counties where voters will decide in November whether to increase or establish a local hotel tax, also known as a “transient occupancy tax.”
Orange residents will also vote on a 1-cent sales tax measure, as the city projects a $27.6 million deficit that it calls “one of the largest financial challenges in the city’s history.” The sales tax is expected to bring in $37 million annually, and the hotel tax would add $3 million.
Diamond Bar: A new 1-cent sales tax
Diamond Bar voters will decide on Measure Q, a 1% local sales tax that would add a penny per dollar to purchases of taxable items. The city estimates the tax will bring in an additional $6 million annually, which could help plug a projected budget deficit of $5 million a year by 2030.
“The city’s challenge is simple: costs for city services are going up faster than revenues,” states Diamond Bar’s fact sheet on the measure, which cites rising public safety costs and $100 million in infrastructure and maintenance needs.
Several other cities have local sales tax measures on the ballot, including Santa Ana’s 1.5% sales tax extension and Los Angeles’ sales tax increase for the Los Angeles Fire Department, Measure FD.
“There’s a variety because circumstances among these local governments vary. The types of economies among governments vary, the local conditions, even the preferences for what type of revenue measure or tax measure might work varies,” Coleman said. “A local government that’s looking at one of these is going to look at a number of different options and consider what might be most palatable to the voters in their community.”
What’s on your ballot?
Our LAist Voter Game Plan is here to help guide you through the Nov. 3 election with guides to races across Los Angeles and Orange counties — and that long list of state propositions — to help you cast a ballot that’s in line with your own personal beliefs and values.
But the one thing we don’t do? We don’t tell you how to vote. That part is left up to you.
A firefighter battles the Eaton Fire, Jan. 8, 2025, in Altadena, Calif.
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Ethan Swope
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Associated Press
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Topline:
At the height of the Los Angeles fires in 2025, millions of residents were exposed in a 24-hour period to toxic lead levels from smoke that were 80 times higher than the typical background level, according to a new study. Researchers from the California Institute of Technology compared the chemical composition of smoke from the Eaton Fire with that of a wildfire and found that the urban plume had more lead, arsenic and halogens (which include chlorine and bromine) linked to burning vehicles, building materials and electronics.
Why it matters: “The main, key finding is really that wildfire smoke is very different fundamentally from the urban smoke,” said Nga Lee “Sally” Ng, an author of the study published Wednesday in the journal Science Advances. With the new technology they used to measure what was in the smoke, they were able to “actually see the very detailed component of these particles that we are breathing.”
Health effects: Ed Avol, professor emeritus in the Keck School of Medicine at the University of Southern California who has researched the health effects of air pollution for decades, said significant exposure to heavy metals is consistent with what he’d expect, “but certainly surprising because we haven’t been able to document this sort of thing.” “One of the real advantages of this study is that it had the opportunity to make measurements sort of hour-by-hour across the sampling network. And typically we make measurements of airborne particulates and so forth a couple of times a week, at best,” said Avol, who wasn’t involved in the study.
The backstory: The two wind-whipped infernos in Altadena and the Pacific Palisades that ignited on Jan. 7, 2025, killed at least 31 people and destroyed more than 16,000 structures, mostly homes, and everything in them — cars, paint, furniture, chemicals under sinks and more. Millions of people were exposed to smoke, which across the entire United States has been linked to tens of thousands of deaths annually. A recent study found that metal mixtures in the leftover smoke, ash and debris from the deadly 2023 Maui wildfires were harmful to the lung health of people living nearby long after the burning ended.
At the height of the Los Angeles fires in 2025, millions of residents were exposed in a 24-hour period to toxic lead levels from smoke that were 80 times higher than the typical background level, according to a new study.
Researchers from the California Institute of Technology compared the chemical composition of smoke from the Eaton Fire with that of a wildfire and found that the urban plume had more lead, arsenic and halogens (which include chlorine and bromine) linked to burning vehicles, building materials and electronics.
“The main, key finding is really that wildfire smoke is very different fundamentally from the urban smoke,” said Nga Lee “Sally” Ng, an author of the study published Wednesday in the journal Science Advances. With the new technology they used to measure what was in the smoke, they were able to “actually see the very detailed component of these particles that we are breathing.”
Co-author Haroula Baliaka said understanding the different chemical compositions of smoke from an urban versus a wildland fire helps bridge a missing gap in research. Wildfires are growing larger, more intense, faster-moving and more frequent largely because of drier and warmer weather associated with human-caused climate change. As urban growth and climate change push more fires into cities, researchers said monitoring and emergency response will have to adapt.
Ed Avol, professor emeritus in the Keck School of Medicine at the University of Southern California who has researched the health effects of air pollution for decades, said significant exposure to heavy metals is consistent with what he’d expect, “but certainly surprising because we haven’t been able to document this sort of thing.”
“One of the real advantages of this study is that it had the opportunity to make measurements sort of hour-by-hour across the sampling network. And typically we make measurements of airborne particulates and so forth a couple of times a week, at best,” said Avol, who wasn’t involved in the study.
Thousands of structures burned, releasing toxic chemicals
The two wind-whipped infernos in Altadena and the Pacific Palisades that ignited on Jan. 7, 2025, killed at least 31 people and destroyed more than 16,000 structures, mostly homes, and everything in them — cars, paint, furniture, chemicals under sinks and more. Millions of people were exposed to smoke, which across the entire United States has been linked to tens of thousands of deaths annually. A recent study found that metal mixtures in the leftover smoke, ash and debris from the deadly 2023 Maui wildfires were harmful to the lung health of people living nearby long after the burning ended.
During the fires, researchers measured trace elements of fine particulate matter, or PM2.5, every hour reported by instruments in the Atmospheric Science and Chemistry mEasurement NeTwork ( ASCENT ), a relatively new network of air quality monitors across the U.S. that measures the size and chemical composition of these particulates in real time. Ng said ASCENT is the U.S.'s first measurement network able to measure the chemical composition of airborne particles in real time.
Researchers were able to see what chemicals were in the smoke, track how its composition changed over the fire’s course, and distinguish emissions coming from burning structures. From there, they estimated how many people across Los Angeles were exposed to the heavy metals, particularly lead, during the fire’s first days.
They compared the typical value of lead before the fires and the chemical makeup of smoke from a 2024 fire in Riverside County that burned mostly vegetation with data from the Eaton Fire plume. Contrasted with the wildfire smoke, the plume from the LA fire contained 50 times more lead, three times more arsenic, and seven times more halogens. At the peak of burning, about 7 million people were exposed for 24 hours to lead levels more than 80 times what’s typical.
Lead is a neurotoxin that can stunt children’s development, lower IQ scores and increase blood pressure in adults. Scientists still don’t know how short-term, high exposure to lead impacts human health. Arsenic exposure is associated with various cancers.
Yaguang Wei, assistant professor in the department of environmental medicine at Icahn School of Medicine at Mount Sinai who researches the health impacts of air pollution, wildfire smoke and severe weather, said their findings reinforced some conclusions of a recent study he co-authored that found, in part, that PM2.5 from wildfire smoke was more toxic than particulates from other sources.
“I think their findings are not surprising,” said Wei, who was not involved in the study. When fires burn properties, they’re also burning “a lot of lead on your wall paint and the plastics and electronics and those are very toxic” when they burn, he said.
Monitoring, policies and emergency response need to adapt, experts say
Wei said the study has “important policy implications.” He thinks governments should take stronger actions to protect public health during these fires by investing in more wildfire monitoring and public alerts, and having more prescribed fires.
For Avol, the study is a reminder of our “strange and increasingly dangerous new world” where urban and wildland intersect — and increasingly catch fire.
“It reminds us to be cautious and be concerned and, you know, think about what we can do to minimize this. We’re not going to stop using all these materials containing metals and halogens and so forth in our homes,” he said. “How do we protect people from being exposed to that?”
The Associated Press receives support from the Walton Family Foundation for coverage of water and environmental policy. The AP is solely responsible for all content. For all of AP’s environmental coverage, visit https://apnews.com/hub/climate-and-environment