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The most important stories for you to know today
  • SoCal hotel workers went on strike Sunday.
    People walk around in red shirts with yellow signs that say "On Strike" and "En Huelga"
    About 150 hotel workers marched around in a loop in front of the InterContinental Hotel in downtown Los Angeles on Sunday, July 2.

    Today in How To LA: 

    SoCal workers strike at downtown hotels, a second bus carrying migrants from the Texas-Mexico border arrived at Union Station; plus, more tributes to Chris “Spanto” Printup

    Top story: Hotel workers across Southern California went on strike Sunday morning after the contract between UNITE HERE Local 11 and 61 hotels expired Friday. Workers are protesting for better pay, affordable health care and feasible workloads at their hotels. For example, one of their demands is an immediate $5 wage increase with $3 annual bumps through the remainder of the 3-year contract totaling an $11 increase.

    More news you need to know:

    • On Saturday, a bus carrying migrants from the Texas-Mexico border arrived at Union Station —  the second sent to Los Angeles by Texas Gov. Greg Abbott in a little over two weeks.  City officials and a collection of nonprofits scrambled to assist the group, which includes 11 children. It’s expected many will stay with relatives nearby while they await asylum. 
    • July 2 marked the start of the third month of strikes for the Writers Guild of America, and Hollywood experts say that it’ll likely not be resolved before September. Wonder how the writers’ absence will affect the coming year of TV and film content hitting screens? Read NPR's Mandalit del Barco breakdown of the production delays.
    • Four of the candidates competing to replace outgoing Senator Dianne Feinstein in 2024 joined LAist 89.3’s AirTalk to speak about their priorities. Earlier this year, Senator Feinstein announced she would not run for reelection after facing calls from all sides of the aisle expressing worries about the 90-year-old’s ability to serve.

    If you were downtown yesterday, it’s likely that you saw people cosplaying as their favorite anime and comic book characters. But you might also have seen hundreds of cooks, dishwashers, housekeepers and other hotel workers who traded in their uniforms for red shirts and joined the picket line in front of the InterContinental, Sheraton and other locations.

    LA hotel workers demand better pay

    About How to LA Newsletter

    This is the web version of our How To LA newsletter. Sign up here to get this newsletter sent to your inbox each weekday morning

    Hotel workers across Southern California went on strike Sunday morning after the contract between UNITE HERE Local 11 and 61 hotels expired Friday. Workers are protesting for better pay, affordable health care and feasible workloads at their hotels. For example, one of their demands is an immediate $5 wage increase with $3 annual bumps through the remainder of the three-year contract, totaling an $11 increase.

    Currently, hotel workers like kitchen steward Jackeline Reynoso make $25 per hour. The average for a hotel worker is $20-25 per hour.

    “That is not enough in today’s society,” Reynoso said. “The entire economy is playing with us. It’s just crazy.”

    She’s a single mom who is raising a young daughter. According to the Living Wage Calculator, she would need to make a living wage of $43.81 in order to comfortably raise her child in L.A.

    A woman with brown skin tone stands and smiles with her daughter while carrying picket signs.
    Jackeline Reynoso works as a kitchen steward at the InterContinental Hotel in downtown Los Angeles.
    (
    Aaricka Washington
    /
    LAist
    )

    In recent months, we’ve seen several worker strikes, from academic workers at the University of California to school workers with L.A. Unified to Hollywood writers. But this one impacts tourists expecting a warm, welcoming stay at a hotel. With more and more conventions approaching this summer, business could be impacted.

    At the picket lines in front of the InterContinental Hotel, people shouted “Si, Se Puede” while drivers passed by, honking their horns. Some strikers were out there as early as 6 a.m.

    The workers I spoke with told me their wages were too low to fully support their families in L.A., especially with inflation and rent increases. The median gross rent in L.A. County from 2017 to 2021 was $1,641, according to the U.S. Census. In order to afford just a one-bedroom apartment, people need to make a living wage of $64,000, according to a report from the RAND Corporation.

    Mark Laguitan is a food runner for InterContinental Hotels who makes $500-600 per paycheck. He has a wife and two sons.

    “I only live in a studio-type apartment,” Laguitan said. “I have a car to pay and high insurance, plus the rent. Even with both of us working, we can’t afford it. We don’t know if we can buy food. I have a new baby. I don’t know if I can buy milk and diapers. We need this contract, it’s not only because we want it, it's because we need this and we deserve this contract to be signed by the owner.”

    The Westin Bonaventure in Downtown L.A. did reach a tentative deal with the union Thursday, averting a strike there.

    For more on what’s at stake and how the hotels have responded, LAist has this report. We will be updating the story as more news develops.

    Stay safe and cool, L.A. There’s more news below — just keep reading.

    We’re here to help curious Angelenos connect with others, discover the new, navigate the confusing, and even drive some change along the way.

    More news

    (After you stop hitting snooze)

    • On Saturday, a bus carrying migrants from the Texas-Mexico border arrived at Union Station —  the second sent to Los Angeles by Texas Gov. Greg Abbott in a little over two weeks. City officials and a collection of nonprofits scrambled to assist the group, which includes 11 children. It’s expected many will stay with relatives nearby while they await asylum. 
    • July 2 marked the start of the third month of strikes for the Writers Guild of America, and Hollywood experts say that it’ll likely not be resolved before September. Wonder how the writers’ absence will affect the coming year of TV and film content hitting screens? Read NPR's Mandalit del Barco breakdown of the production delays.
    • Four of the candidates competing to replace outgoing Senator Dianne Feinstein in 2024 joined LAist 89.3’s Airtalk to speak about their priorities. Earlier this year, Senator Feinstein announced she would not run for reelection after facing calls from all sides of the aisle expressing worries about the 90-year-old’s ability to serve. 
    • California’s legislature is considering two bills to hold corporations accountable for their contributions to climate change. If approved, California would become the first state in the U.S. to require large corporations to disclose their greenhouse gas emissions.
    • Traveling this summer? Grab the bug spray, public health officials advise. Cases of malaria have popped up in Florida and Texas and in Europe, there are reports of an uptick in mosquito-borne diseases. 
    • There’s a bunch of events planned for the Fourth of July all across Southern California, from fireworks displays and concerts to block parties and parades. Check them all out in the LAist weekly event roundup as well as other fun things to do this week.

    *At LAist we will always bring you the news freely, but occasionally we do include links to other publications that may be behind a paywall. Thank you for understanding! 

    Wait... one more thing

    The Top Three Tea-Sipping Trends

    A Brown man wearing a black jacket and pants holding a beverage poses for the camera in front of a well-lit bar.
    Chris "Spanto" Printup attends 1800 Tequila’s VIP dinner presented by the Los Angeles Rams and SoFi on February, 12 2022
    (
    Presley Ann
    /
    Getty Images for 1800 Tequila
    )

    THREE — Trek across Los Angeles by foot 

    As an Angeleno, you might find yourself driving across the city on any given day for an odd errand, or to hit the beach. But have you ever considered taking that journey by foot? Videographer Tucker O’Neill and his friend Wes Braumbaugh decided to tackle the Los Angeles sprawl, making a 40-mile trek from Pasadena to Santa Monica last Sunday. The walk took 14 hours, and O’Neill posted about his journey on Reddit.com, and garnered a lot of attention. My colleague Fiona Ng sat down with O’Neill and Braumbaugh for a Q&A about the journey.

    TWO – The Lakers continue to make moves over the weekend 

    The new NBA regular season won't tip off until the fall, but we've just entered the league's free agency period, where plenty of players (and money) move as teams look for ways to reshape their rosters. L.A.'s two teams have been busy. Looking to reel in their 18th championship, the Lakers have re-signed forward Rui Hachimura and guards D’Angelo Russell and Austin Reaves. The team is also adding guard Gabe Vincent, following his standout season with the Miami Heat. The Clippers are re-signing guard Russell Westbrook and acquiring forward K.J. Martin from the Houston Rockets in exchange for two future second-round draft picks.

    ONE - Tributes to Spanto continue…

    Following the tragic passing of Chris “Spanto” Printup, founder of L.A. streetwear brand Born x Raised, a mural has been raised on Hollywood and Highland in his honor. Local street artist Alex Ali Gonzalez painted the mural. Photographer Carlos Jaramillo, a former collaborator of Spanto’s, noted in a post that the mural was based on a photo that Spanto had once told him was his “favorite picture taken of him.” Born x Raised reposted Gonzalez’s mural to their Instagram stories, along with other tributes from Spanto’s fans and supporters. Spanto’s mural joins Gonzalez’s two other murals of deceased culinary legend Anthony Bourdain and rap music star Mac Miller on the wall.

    Help Us Cover Your Community

    Got something you’ve always wanted to know about Southern California and the people who call it home? Is there an issue you want us to cover? Ask us anything.

    Have a tip about news on which we should dig deeper? Let us know.

  • DOJ wanted to stop counting of 20K ballots
    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.

    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."

  • Sponsored message
  • State officials may pull project funding
    A view from above of a pair of green hills at the bottom of the frame and the ocean in the horizon.
    Catalina Island is home to more than 4,000 residents, who live with slow, unreliable internet connection.

    Topline:

    California’s Public Utilities Commission will decide whether to claw back or keep $37.5 million in grant funding to bring fast, reliable internet to Catalina Island.

    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.

    Read on … for more on where things stand.

    California’s Public Utilities Commission will decide on Thursday whether to claw back or keep $37.5 million in grant funding meant to bring fast, reliable internet to Catalina Island.

    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.

    Nereida Moreno contributed to the reporting of this story.

  • All the tax measures on the LA, OC ballots
    An illustrated wallet with cash, a receipt and coins sits before a Los Angeles street scene with palm trees and skyline.
    More than 30 cities in L.A. and Orange counties have tax increases of some kind on the Nov. 3 ballot.

    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.

    The only other utility users tax on the ballot in Los Angeles or Orange counties this year is in San Marino, where residents will decide whether to extend the city’s existing 5% utility users tax, which is set to expire on March 31, 2027, and increase it to 6%. Last year, the tax provided almost $2.2 million in revenue. As of 2021, a total of 162 out of 540 California cities and counties had a utility users tax, according to Coleman’s California Local Government Finance Almanac.

    Orange: Hotel and sales taxes could go up 

    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 would raise 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.

    You can find it all at LAist.com/Vote.

    Further reading

  • LA fires exposed millions to materials
    Person in a red helmet and yellow protective clothing aims a hose at a burning pickup truck as flames and thick orange smoke fill the street.
    A firefighter battles the Eaton Fire, Jan. 8, 2025, in Altadena, Calif.

    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?”

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