Topline:
Previous scientific research shows that the detritus left behind after a fire can be laden with toxic compounds and gases, from heavy metals to burned plastics to asbestos.
Why it matters: Exposure to the ash and even air can cause short-term health impacts, from the runny eyes Ronaghi experienced to respiratory issues and mor
Keep reading ... for tips on how to protect yourself while cleaning up after the fires.
Reza Ronaghi lost his home in the Los Angeles wildfires last week.
"Not a single house survived in our two-block area," he said.
Ronaghi is a pulmonologist at the University of California, Los Angeles. So he is well-acquainted with the health risks associated with breathing in wildfire smoke. But even he, a medical professional, was shocked to see how many potential health risks lurked in the detritus, ash, and smoke left behind after the fires.
"This is not just a regular fire," he said. The ash contains material from "thousands of houses and all the material the house was made of, the inside, the appliances, the roof, the list goes on."
But what alarmed him more was how little health and safety guidance officials offered to residents returning to the neighborhood to see what was left of their homes.
He and several neighbors were allowed back into their Pacific Palisades neighborhood a few days after the burn; the ground was still smoking. He wore an N95 mask, but quickly realized he should have more thoroughly protected himself — with gloves, goggles, a respirator mask like those used when working with chemicals, and long clothes that he could remove and bag immediately after leaving the area.
After just 20 or 30 minutes, he said, his eyes were watering and his nose was irritated. Later on, he realized his skin was irritated where it had accidentally been exposed.
Previous scientific research shows that the detritus left behind after a fire can be laden with toxic compounds and gases, from heavy metals to burned plastics to asbestos. Exposure to the ash and even air can cause short-term health impacts, from the runny eyes Ronaghi experienced to respiratory issues and more.
But it's not just the immediate health issues that concern Ronaghi. The exposure people experience now, he worries, could lead to health effects down the road.
Exposure to toxic materials left behind after houses burn can be "actually much more dangerous than what smoke may do to your lungs alone," he said.
So as people return to their homes, he wants them to take care — because "right now, we're talking about long-term consequences."
It matters what materials have burned
Wildfire smoke and ash can be dangerous to people's health even when a fire burns primarily trees and plants. But fires that burn through man-made materials are often filled with a more toxic mix. After California's 2018 Camp Fire, researchers found abnormally high concentrations of lead downwind of the burn, which they suspect came from the houses that went up in smoke. Researchers in Los Angeles have found preliminary suggestions that the ash there has high concentrations of metals, as well. Exposure to lead can lead to short-term problems like headaches or dizziness. High exposures have been associated with issues from cognitive trouble to reproductive and cardiovascular problems.
It's not just metals. Appliances, coolant fluid, polyester curtains, cleaning products — all the manmade parts of a house can produce a rich suite of health-harming compounds and gases, like benzene and formaldehyde, and polycyclic aromatic hydrocarbons, or PAHs.
But research on the long-term effects of wildfire smoke has only recently begun.
Surveys after the Lahaina wildfires in 2023 found that residents exposed to smoke and ash experienced increases in heart, kidney, and mental health issues. An EPA-led study exposed mice to smoke from army burn pits, which include many materials that might be found in burning homes and cars; the mice exposed to the smoke showed signs of inflammation and lung injury.
In the most damaged and contaminated areas, officials will usually send in debris-removal teams to clear away the most dangerous waste and ash. But Ronaghi stressed that anyone visiting the area before that process is complete should take precautions.
He recommends anyone visiting burn sites use N95 masks or respirators, if possible, along with goggles to protect their eyes (ski or swim goggles would work in a pinch, he says); gloves; and long clothes that they can remove before returning to wherever they're staying. Bag those clothes during transport, and wash them immediately upon arriving home, other experts suggest, to avoid bringing hazards into your living space.
Even those whose homes are still standing, including those far from the front lines of the fire, may be contending with ash and smoke. Research conducted after the 2021 Marshall Fire in Boulder, Colo., found that "smoke managed to penetrate indoors and through cracks underneath doors and windows," in homes downwind of the fire, said Joost de Gouw, a University of Colorado, Boulder atmospheric chemist and author of one of the studies. Residents reported health disturbances, from headaches to respiratory problems, for weeks afterward.
Hazardous gases associated with the wildfire smoke, such as benzene and naphthalene, could be detected in homes downwind of the Marshall Fire long after the burns were put out. Those gases, another study suggested, could have been absorbed by textiles, mattresses, and maybe even the wood framing and drywall in homes.
Those gases take time to dissipate, de Gouw said, during which period residents may still be exposed.
After the fire, "all of these gases that were absorbed into building materials were slowly being rereleased through indoor air, where you were smelling them," he said. "That process took about five weeks before everything ventilated out again."
How to clean up
Even for those farther from the burned neighborhoods, the cleanup could be dangerous — and could stretch over weeks.
Because the leftover ash and smoke can contain dangerous components, experts who spoke with NPR recommend protecting yourself thoroughly whenever you clean your home if it was affected by wildfire smoke.
"People who are going back to these homes should wear N95 masks to protect themselves," said Colleen Reid, a health geographer at the University of Colorado, Boulder, who worked on one of the Marshall Fire smoke studies. "We found that when people cleaned, it resuspended that ash," lifting it back into the air where people might inhale it.
Reid also suggests wearing gloves and long-sleeved clothes and pants while cleaning.
She said scientists are still working on coming up with rigorously tested recommendations for best cleaning practices after wildfires. But a 2023 study shows that cleaning a home's hard surfaces by dusting, wiping down with damp cloths, and mopping can effectively lower the concentrations of smoke-associated gases.
Reid suggests "using a HEPA-filter vacuum, and really cleaning all the surfaces — like wiping them down to try to remove those sources of the chemicals that are off-gassing."
More porous surfaces, like couches and other textiles, can persist as an ongoing source of exposure; Reid suggests replacing them, if possible.
de Gouw and other researchers found that constantly running air filters with activated carbon lowered the gas concentrations in those first weeks after the fire. But concentrations went back up when the air filters were stopped — so "it's important to keep them running for those few weeks," he said.
Research from Portland State University found that PAH levels can be lowered post-fire by simple cleaning and washing any textiles that can be washed. Long-term exposure to PAH's has been linked to increased risk of cancer.
The message, said de Gouw, is to clean everything one can carefully and thoroughly, because the smoke can affect nearly every part of a home — even in houses far from the fire line. Any efforts to lower the dose of potentially dangerous smoke and ash byproducts can help protect people, he said.
Ronaghi is still dealing with the fallout of the fires. For now, his family is dealing with the loss of their home and figuring out how, and where, to rebuild their life.
But as he processes, he wants to make sure others understand the ongoing risks.
"Most of the time we hear about fires and we say, okay, you know, we'll be okay. We're kind of removed from it," he said.
But for people across Los Angeles, it's all too possible to be exposed to health-damaging toxins right now: "And you won't know for a very, very, very long time," he said. "That's why it's super important" to protect yourself.
Copyright 2025 NPR
Topline:
After copper wire theft left the Sixth Street Bridge in darkness for years, the city of Los Angeles has hired a Pasadena-based engineering firm to restore the lighting, a move aimed at improving safety for Boyle Heights and the surrounding neighborhoods.
The backstory? Aging infrastructure, copper wire theft and delayed repairs led to nearly 2,000 streetlight service requests in Boyle Heights in 2024. Nearly seven miles of copper wire have been reported stolen from the Sixth Street Bridge.
Read on ... for more on the history of the Sixth Street Bridge.
After copper wire theft left the Sixth Street Bridge in darkness for years, the city of Los Angeles has hired a Pasadena-based engineering firm to restore the lighting, a move aimed at improving safety for Boyle Heights and the surrounding neighborhoods.
City officials contracted Tetra Tech to relight the bridge, which has been plagued by copper wire theft since its opening in 2022. The outages have frustrated residents and commuters who use the bridge to walk, run, bike and drive between downtown LA and the Eastside.
Aging infrastructure, copper wire theft and delayed repairs led to nearly 2,000 streetlight service requests in Boyle Heights in 2024. Nearly seven miles of copper wire have been reported stolen from the Sixth Street Bridge.
Tetra Tech began working on the project’s design in January and is scheduled to restore the wiring to all lights along the bridge, including along roadways, barriers, ramps, stairways and arches before the 2028 Olympic and Paralympic Games come to Los Angeles that summer, according to a Feb. 18 news release from Councilmember Ysabel Jurado’s office.
The firm – which was selected by the city’s Bureau of Engineering – will fortify the pull boxes, service cabinet and conduits to protect against copper wire theft. Tetra Tech will also install a security camera system to deter vandalism and theft.
“When our streets are well-lit, our neighborhoods feel safer and more connected,” Jurado said in the news release. “The Sixth Street Bridge plays a vital role in connecting Angelenos between the Eastside and the heart of the City.”
Jurado – who pledged to look into fixing the Sixth Street Bridge lights when she was elected in 2024 – said the partnership with Tetra Tech “moves us one step closer to restoring one of the City’s most iconic landmarks as a safe, welcoming public space our communities deserve.”
According to officials, the total contract value with Tetra Tech is $5.3 million, which includes work on the Sixth Street Bridge as well as the Sixth Street PARC project, which encompasses 12 acres of recreational space underneath and adjacent to the bridge.
The PARC project will make way for sports fields, fitness equipment, event spaces and a performance stage. PARC’s grand opening is anticipated later this year.
Because the work for the PARC project and the bridge is connected, the Board of Engineers recommended using the existing PARC contract with Tetra Tech to ensure completion ahead of the 2028 Games, officials said.
The cost for the design work on the bridge alone is roughly $1 million.
On Thursday, Jurado announced that her streetlight repair crew had restored lighting and strengthened infrastructure for more than 400 streetlights across her district, including Boyle Heights, Lincoln Heights, and El Sereno. Next, they plan to tackle repairs in downtown L.A.
Topline:
For the last 70 years, the 27th Street Bakery hasn’t just been the go-to place for people who want to spend less time in the kitchen — it’s become a staple in South Central, providing jobs and security for people living in the neighborhood.
The history: The bakery sits on Central Avenue, the focal point of Black Los Angeles between the 1930s and 1960s. As segregation laws were struck down, Black people in LA began to move elsewhere and took their businesses with them. The bakery, though, is still Black-owned and operating 70 years later.
Read on ... for more on the local landmark.
For the last 70 years, the 27th Street Bakery hasn’t just been the go-to place for people who want to spend less time in the kitchen — it’s become a staple in South Central, providing jobs and security for people living in the neighborhood.
The bakery is Black-owned and in its third generation as a business. It’s co-owned by sisters Denise Cravin-Paschal and Olympic gold-medalist Jeanette Bolden-Pickens, as well as her husband Al Pickens.
“My grandfather employed a lot of people around here as he was growing his business and so have we,” Cravin-Paschal told the LA Local. “They feel that this is a safe place to come. We have the respect of being here for 70 years and so we enjoy it.”
The bakery sits on Central Avenue, the focal point of Black Los Angeles between the 1930s and 1960s. As segregation laws were struck down, Black people in LA began to move elsewhere and took their businesses with them. The bakery, though, is still Black-owned and operating 70 years later.
Today it is considered the largest manufacturer of sweet potato pies on the West Coast, the bakery’s website states. Last year, the city and District 9 Councilmember Curren Price Jr. presented the bakery with a plaque that reads: “A Walk Down Central Avenue — A legacy of community: powered by the people and its places.”
It hangs on the wall in the bakery’s lobby along with several other photos and recognitions they’ve received over the years.
“Our goal is to keep this legacy alive and we’re celebrating 70 years of being here in business. We are so grateful to the community,” Bolden-Pickens said.
In celebration of its anniversary, a sign in the bakery says it is offering one slice of sweet potato pie for 70 cents on Saturdays starting this weekend through Oct. 31.
The bakery began as a restaurant in the 1930s on Central Avenue founded by Harry and Sadie Patterson, according to the family and Los Angeles Conservancy. Back then, Central Avenue was the epicenter of LA’s Black community and Patterson, who came from Shreveport, Louisiana, decided to bring his Southern recipes to life in Los Angeles.
The restaurant later became a bakery in 1956, according to the bakery’s website. Patterson’s daughter Alberta Cravin and her son Gregory Spann took over the bakery in 1980. After Spann passed away, Cravin’s daughters — the sisters who are current owners — took over the family business. Five other relatives also help them out, Cravin-Paschal said.
These days, the bakery is open Tuesday through Saturday each week and the bulk of their customers are other businesses. They serve nearly 300 vendors including convenience stores like 7-Eleven, Ralphs grocery stores, Smart & Final, ARCO gas stations, restaurants and other mom-and-pop stores. Louisiana Fried Chicken has been a customer since 1980, Cravin-Paschal said.
An average delivery today is usually 45 dozen pies and they also ship orders out of state, Cravin-Paschal said.
She also told The LA Local they have six full time employees and most of them have worked for the bakery at least 25 years.
“I like working here, I like the people,” Maximina “Maxi” Rodriguez, a longtime employee, told The LA Local. After 32 years at the bakery, she said she plans to retire in June. “I’m going to miss it.”
Rodriguez said working at the bakery is a family affair for her, too. Her sister, Guadalupe Garibaldi, has worked at the bakery for over 40 years and her niece, Yoselin Garibaldi, is now a cashier and driver.
For Bolden-Pickens and Cravin-Paschal, running the bakery is a labor of love. Both told The LA Local that their grandfather taught them to stay true to the fresh ingredients they use and not to cut corners.
These lessons helped Bolden-Pickens in her life before taking over the family business. She won a gold medal as part of the U.S. 4×100 meter relay team in track and field during the 1984 Olympics.
“What I learned from being an Olympian is that it takes a lot of hard work. I learned that from my grandfather,” she said.
Bolden-Pickens said it hasn’t been easy running the business, but they’ve been able to stay afloat because of the lessons learned from their grandfather.
“I remember during the pandemic, we actually had to go to the egg farm and stand in line for a couple of hours just to get the eggs that we needed,” Bolden-Pickens said. “We use the best spices. We make our own vanilla.”
Cravin-Paschal said after the death of their brother Gregory Spann, who was the main baker for nearly two decades, they struggled for a few years to keep the recipe and taste consistent. But eventually they figured it out.
“We had a little rough spot because we all know the recipes but you have to put it together (correctly),” Cravin-Paschal said. “Now we’re back to the original taste.”
Topline:
As marijuana use among teens has grown in the past decade, researchers have been trying to better understand the health risks of the drug. Now, a new longitudinal study finds that cannabis use among adolescents increases risks of being diagnosed with bipolar and psychotic disorders, as well as anxiety and depression, years later.
What was the study: Researchers analyzed health data on 460,000 teenagers in the Kaiser Permanente Health System in Northern California. The teens were followed until they were 25 years old.
What was the result: They found that the teens who reported using cannabis in the past year were at a higher risk of being diagnosed with several mental health conditions a few years later, compared to teens who didn't use cannabis.
Read on ... for more on what the study found.
As marijuana use among teens has grown in the past decade, researchers have been trying to better understand the health risks of the drug. Now, a new longitudinal study finds that cannabis use among adolescents increases risks of being diagnosed with bipolar and psychotic disorders, as well as anxiety and depression, years later.
"This is very, very, very worrying," says psychiatrist Dr. Ryan Sultan at Columbia University, a cannabis researcher who wasn't involved in the new study published in the latest JAMA Health Forum.
Researchers analyzed health data on 460,000 teenagers in the Kaiser Permanente Health System in Northern California. The teens were followed until they were 25 years old. The data included annual screenings for substance use and any mental health diagnoses from the health records. Researchers excluded the adolescents who had symptoms of mental illnesses before using cannabis.
"We looked at kids using cannabis before they had any evidence of these psychiatric conditions and then followed them to understand if they were more likely or less likely to develop them," says Dr. Lynn Silver, a pediatrician and researcher at the Public Health Institute, and an author of the new study.
They found that the teens who reported using cannabis in the past year were at a higher risk of being diagnosed with several mental health conditions a few years later, compared to teens who didn't use cannabis.
Teens who reported using cannabis had twice the risk of developing two serious mental illnesses: bipolar, which manifests as alternating episodes of depression and mania, and psychotic disorders, such as schizophrenia which involve a break with reality.
Now, only a small fraction — nearly 4,000 — of all teens in the study were diagnosed with each of these two disorders. Both bipolar and psychotic disorders are among the most serious and disabling of mental illnesses.
"Those are the scarier conditions that we worry about," says Sultan.
Silver points out these illnesses are expensive to treat and come at a high cost to society. The U.S. cannabis market is an industry with a value in the tens-of-billions — but the societal cost of schizophrenia has been calculated to be $350 billion a year.
"And if we increase the number of people who develop that condition in a way that's preventable, that can wipe out the whole value of the cannabis market," Silver says.
The new study also found that the risk for more common conditions like depression and anxiety was also higher among cannabis users.
"Depression alone went up by about a third," says Silver, "and anxiety went up by about a quarter."
But the link between cannabis use and depression and anxiety got weaker for teens who were older when they used cannabis. "Which really shows the sensitivity of the younger child's brain to the effects of cannabis," says Silver. "The brain is still developing. The effects of cannabis on the receptors in the brain seem to have a significant impact on their neurological development and the risk for these mental health disorders."
Silver hopes these findings will make teens more cautious about using the drug, which is not as safe as people perceive it to be.
"With legalization, we've had a tremendous wave of this perception of cannabis as a safe, natural product to treat your stress with," she says. "That is simply not true."
The new study is well designed and gets at "the chicken or the egg, order-of-operations question," says Sultan. There have been other past studies that have also found a link between cannabis use and mental health conditions, especially psychosis. But, those studies couldn't tell whether cannabis affected the likelihood of developing mental health symptoms or whether people with existing problems were more likely to use cannabis — perhaps to treat their symptoms.
But by excluding teens who were already showing mental health symptoms, the new study suggests a causal link between cannabis use and later mental health diagnoses. Additional research is needed to understand the link fully.
Sultan, the psychiatrist and researcher at Columbia University, says the study confirms what he's seeing in his clinic — more teens using cannabis who've developed new or worsening mental health symptoms.
"It is most common around anxiety and depression, but it's also showing up in more severe conditions like bipolar disorder and psychosis," he says.
He notes that mental health disorders are complex in origin. A host of risk factors, like genetics, environment, lifestyle and life experiences all play a role. And some young people are more at risk than others.
"When someone has a psychotic episode in the context of cannabis or a manic episode in the context of cannabis, clinicians are going to say, 'Please do not do that again because you're you're you're playing with fire,'" he says.
Because the more they use the drug, he says the more likely that their symptoms will worsen over time, making recovery harder.
"What we're worried about [is if] you sort of get stuck in psychosis, it gets harder and harder to pull the person back," says Sultan. "Psychosis and severe mood disorders, particularly bipolar disorder are like seizures in your brain. They're sort of neurotoxic to your brain, and so it seems to be associated with a more rapid deterioration of the brain."
Topline:
A proposed bill in the California legislature would require certain electric bikes to register with the Department of Motor Vehicles and to carry license plates.
Why does it matter?: This proposal would make it easier to identify people involved in dangerous incidents.
Why now?: E-bike related injuries increased 18-fold between 2018 and 2023, according to data from the Statewide Integrated Traffic Records System.
Read on for more details …
Some electric bikes in California could soon require license plates under a proposed state bill aiming to address the rise in electric bike related injuries.
AB 1942 or the E-bike Accountability Act, would apply exclusively to Class 2 and Class 3 electric bikes.
Class 2 bikes can be operated without peddling until it reaches the speed of 20 mph.
Class 3 bikes reach a max speed of 28 mph; motor assist could only kick in with peddling.
The bill would also require owners to carry proof of ownership and would direct the Department of Motor Vehicles to establish a registration process. It was introduced by Assemblymember Rebecca Bauer-Kahan of Orinda in Contra Costa County earlier this month.
E-bike injuries spiked 18-fold between 2018 and 2023, according to state traffic data.
The bill may be heard in committee March 16.
