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Tire toxicity faces fresh scrutiny after salmon die-offs
For decades, concerns about automobile pollution have focused on what comes out of the tailpipe. Now, researchers and regulators say, we need to pay more attention to toxic emissions from tires as vehicles roll down the road.
At the top of the list of worries is a chemical called 6PPD, which is added to rubber tires to help them last longer. When tires wear on pavement, 6PPD is released. It reacts with ozone to become a different chemical, 6PPD-q, which can be extremely toxic — so much so that it has been linked to repeated fish kills in Washington state.
The trouble with tires doesn’t stop there. Tires are made primarily of natural rubber and synthetic rubber, but they contain hundreds of other ingredients, often including steel and heavy metals such as copper, lead, cadmium and zinc.
As car tires wear, the rubber disappears in particles, both bits that can be seen with the naked eye and microparticles. Testing by a British company, Emissions Analytics, found that a car’s tires emit 1 trillion ultrafine particles per kilometer driven — from 5 to 9 pounds of rubber per internal combustion car per year.
And what’s in those particles is a mystery, because tire ingredients are proprietary.
“You’ve got a chemical cocktail in these tires that no one really understands and is kept highly confidential by the tire manufacturers,” said Nick Molden, CEO of Emissions Analytics. “We struggle to think of another consumer product that is so prevalent in the world and used by virtually everyone, where there is so little known of what is in them.”
Regulators have only begun to address the toxic tire problem, though there has been some action on 6PPD.
The chemical was identified by a team of researchers, led by scientists at Washington State University and the University of Washington, who were trying to determine why coho salmon returning to Seattle-area creeks to spawn were dying in large numbers.
Working for the Washington Stormwater Center, the scientists tested some 2,000 substances to determine which one was causing the die-offs, and in 2020 they announced they’d found the culprit: 6PPD.
The Yurok Tribe in Northern California, along with two other West Coast Native American tribes, have petitioned the Environmental Protection Agency to prohibit the chemical. The EPA said it is considering new rules governing the chemical. “We could not sit idle while 6PPD kills the fish that sustain us,” said Joseph L. James, chairman of the Yurok Tribe, in a statement. “This lethal toxin has no place in any salmon-bearing watershed.”
California has begun taking steps to regulate the chemical, last year classifying tires containing it as a “priority product,” which requires manufacturers to search for and test substitutes.
“6PPD plays a crucial role in the safety of tires on California’s roads and, currently, there are no widely available safer alternatives,” said Karl Palmer, a deputy director at the state’s Department of Toxic Substances Control. “For this reason, our framework is ideally suited for identifying alternatives to 6PPD that ensure the continued safety of tires on California’s roads while protecting California’s fish populations and the communities that rely on them.”
The U.S. Tire Manufacturers Association says it has mobilized a consortium of 16 tire manufacturers to carry out an analysis of alternatives. Anne Forristall Luke, USTMA president and CEO, said it “will yield the most effective and exhaustive review possible of whether a safer alternative to 6PPD in tires currently exists.”
Molden, however, said there is a catch. “If they don’t investigate, they aren’t allowed to sell in the state of California,” he said. “If they investigate and don’t find an alternative, they can go on selling. They don’t have to find a substitute. And today there is no alternative to 6PPD.”
California is also studying a request by the California Stormwater Quality Association to classify tires containing zinc, a heavy metal, as a priority product, requiring manufacturers to search for an alternative. Zinc is used in the vulcanization process to increase the strength of the rubber.
When it comes to tire particles, though, there hasn’t been any action, even as the problem worsens with the proliferation of electric cars. Because of their quicker acceleration and greater torque, electric vehicles wear out tires faster and emit an estimated 20% more tire particles than the average gas-powered car.
A recent study in Southern California found tire and brake emissions in Anaheim accounted for 30% of PM2.5, a small-particulate air pollutant, while exhaust emissions accounted for 19%. Tests by Emissions Analytics have found that tires produce up to 2,000 times as much particle pollution by mass as tailpipes.
These particles end up in water and air and are often ingested. Ultrafine particles, even smaller than PM2.5, are also emitted by tires and can be inhaled and travel directly to the brain. New research suggests tire microparticles should be classified as a pollutant of “high concern.”
In a report issued last year, researchers at Imperial College London said the particles could affect the heart, lungs and reproductive organs and cause cancer.
People who live or work along roadways, often low-income, are exposed to more of the toxic substances.
Tires are also a major source of microplastics. More than three-quarters of microplastics entering the ocean come from the synthetic rubber in tires, according to a report from the Pew Charitable Trusts and the British company Systemiq.
And there are still a great many unknowns in tire emissions, which can be especially complex to analyze because heat and pressure can transform tire ingredients into other compounds.
One outstanding research question is whether 6PPD-q affects people, and what health problems, if any, it could cause. A recent study published in Environmental Science & Technology Letters found high levels of the chemical in urine samples from a region of South China, with levels highest in pregnant women.
The discovery of 6PPD-q, Molden said, has sparked fresh interest in the health and environmental impacts of tires, and he expects an abundance of new research in the coming years. “The jigsaw pieces are coming together,” he said. “But it’s a thousand-piece jigsaw, not a 200-piece jigsaw.”
This article was produced by KFF Health News, a national newsroom that produces in-depth journalism about health issues and is one of the core operating programs at KFF — the independent source for health policy research, polling and journalism. KFF Health News is the publisher of California Healthline, an editorially independent service of the California Health Care Foundation.
A Russian court on Monday convicted a theater director and a playwright of terrorism charges and sentenced them to six years each in prison, the latest in an unrelenting crackdown on dissent across the country that has reached new heights since Moscow sent troops into Ukraine.
Zhenya Berkovich, a prominent independent theater director, and playwright Svetlana Petriychuk have already been in jail for over a year awaiting trial.
Authorities claimed their play “Finist, the Brave Falcon” justifies terrorism, which is a criminal offense in Russia punishable by up to seven years in prison. Berkovich and Petriychuk have both repeatedly rejected the accusations against them.
In one hearing, Berkovich told the court that she staged the play in order to prevent terrorism, and Petriychuk echoed her sentiment, saying that she wrote it in order to prevent events like those depicted in the play.
The women’s lawyers pointed out at court hearings before the trial that the play was supported by the Russian Culture Ministry and won the Golden Mask award, Russia’s most prestigious national theater award. In 2019, the play was read to inmates of a women’s prison in Siberia, and Russia’s state penitentiary service praised it on its website, Petriychuk’s lawyer said.
Alexander Zemlianichenko / AP
The case against Berkovich and Petriychuk elicited outrage in Russia. An open letter in support of the two artists, started by the independent Novaya Gazeta newspaper, was signed by more than 16,000 people since their arrest.
The play, the letter argued, “carries an absolutely clear anti-terrorist sentiment.”
Dozens of Russian actors, directors and journalists also signed affidavits urging the court to release the two from custody pending investigation and trial.
Immediately after Russia launched its full-scale invasion of Ukraine, the Kremlin unleashed a sweeping campaign of repression, unparalleled since the Soviet era. It has effectively criminalized any criticism of the war, with the authorities targeting not only prominent opposition figures who eventually received draconian prison terms, but anyone who spoke out against it, publicly or otherwise.
Pressure mounted on critical artists in Russia, too. Actors and directors were fired from state-run theaters, and musicians were blacklisted from performing in the country. Some were slapped with the label “foreign agent,” which carries additional government scrutiny and strong negative connotations. Many have left Russia.
Berkovich, who is raising two adopted daughters, refused to leave Russia and continued working with her independent theater production in Moscow, called Soso’s Daughters. Shortly after the start of the war in Ukraine, she staged an anti-war picket and was jailed for 11 days.
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Americans are increasingly skeptical about the value and cost of college, with most saying they feel the U.S. higher education system is headed in the “wrong direction,” according to a new poll.
Overall, only 36% of adults say they have a “great deal” or “quite a lot” of confidence in higher education, according to the report released Monday by Gallup and the Lumina Foundation. That confidence level has declined steadily from 57% in 2015.
Some of the same opinions have been reflected in declining enrollment as colleges contend with the effects of the student debt crisis, concerns about the high cost of tuition and political debates over how they teach about race and other topics.
Whether a college educations is required to achieve professional success is also up for debate, as only about 1 in 4 Americans say a bachelor’s degree is necessary to secure a well-paying job, according to a March survey from the Pew Research Center.
Employment opportunities and earnings for young men without college degrees have improved in the last decade, reversing some of the economic damage that eroded the group’s fortunes starting in the 1970s. Young men with only a high school degree have seen a slight rebound in their earnings since 2014, Pew found.
The median annual income for men 25- to 34-years-old without a college degree was $45,000 in 2023, a 15% increase from $39,300 in 2014 when adjusted for inflation, according to Pew’s analysis of Census data.
Dimming belief in college
But the dimming view of whether college is worth the time and money extends across all demographics, including gender, age and political affiliation. Among Republicans, the number of respondents with high confidence in higher education has dropped 36 percentage points over the last decade — far more than it dropped for Democrats or independents.
“It’s so expensive, and I don’t think colleges are teaching people what they need to get a job,” said Randy Hill, 59, a registered Republican in Connecticut and a driver for a car service. His nephew plans to do a welding apprenticeship after graduating high school. “You graduate out of college, you’re up to eyeballs in debt, you can’t get a job, then you can’t pay it off. What’s the point?”
The Gallup-Lumina survey’s overall finding — that 36% of adults have strong confidence in higher education — is unchanged from the year before. But what concerns researchers is shifting opinion on the bottom end, with fewer Americans saying they have “some” confidence and more reporting “very little” and “none.” This year’s findings show almost as many people have little or no confidence, 32%, as those with high confidence.
Tuition too high
“The No. 1 deterrent for a student not to pursue a college degree is affordability — they simply think they can’t afford the cost of a higher education,” Michael Itzkowitz, founder of HEA Group, a research and consulting firm focused on college, told CBS MoneyWatch in May.
The schools with the best return on investment for low- and middle-income students include many of California’s state colleges, which tend to be lower-priced than nonprofit private universities, he noted.
Experts say that fewer college graduates could worsen labor shortages in fields from health care to information technology. For those who forgo college, it often means lower lifetime earnings — 75% less compared with those who get bachelor’s degrees, according to Georgetown University’s Center on Education and the Workforce. And during an economic downturn, those without degrees are more likely to lose jobs.
“It is sad to see that confidence hasn’t grown at all,” said Courtney Brown, vice president at Lumina, an education nonprofit focused on increasing the numbers of students who seek education beyond high school. “What’s shocking to me is that the people who have low or no confidence is actually increasing.”
This year’s survey added new, detailed questions in an effort to understand why confidence is shrinking.
Almost one-third of respondents say college is “too expensive,” while 24% feel students are not being properly educated or taught what they need to succeed.
The survey did not specifically touch on the protests this year against the war in Gaza that divided many college campuses, but political views weighed heavily on the findings. Respondents voiced concerns about indoctrination, political bias and that colleges today are too liberal. Among the respondents who lack confidence, 41% cite political agendas as a reason.
Generally when people express confidence in higher education, they are thinking of four-year institutions, according to Gallup. But the survey found that more people have confidence in two-year institutions. Forty-nine percent of adults say they have “a great deal” or “quite a lot” of confidence in two-year programs, compared with 33% of Americans who feel that way about four-year colleges.
California college student Kristen Freeman understands why.
“It’s about saving money. That’s why I went to a two-year. It’s more bang for your buck,” said Freeman, 22, a sociology major at Diablo Valley Community College with plans to transfer to San Jose State University for the final two years of college.
Freeman understands the concerns about indoctrination and whether college prepares students for life and work but also feels the only way to change structural problems is from the inside. “I am learning about the world around me and developing useful skills in critical thinking,” Freeman said. “I think higher education can give students the spark to want to change the system.”