The pollution from tires is a massive health and environmental scandal
Buckle up, because what you’re about to find out might make you angry. Tires are everywhere! Cars, trucks, bikes, motorcycles, planes. And still, almost nobody talks about the huge problems they cause. Like the 6 million metric tons of toxic particles the world generates every year just from tires wearing down. That’s a health and environmental disaster on a massive scale. Tires are silent killers, and they contaminate our air, our water and our food. So why the deafening silence? Maybe because an industry worth $180 billion a year does everything it can to keep a lid on it. That’s what we’re going to try to work out over the course of this piece.
Electric cars make tire pollution worse
Electric cars get pitched to us over and over as the miracle green fix. But one problem keeps getting left out: battery weight. Those behemoths run several hundred kilos apiece, which makes an electric vehicle 10 to 30% heavier than its gas equivalent. And the heavier the vehicle, the faster its tires wear out. So EV tires wear down 20% faster on average than the tires on a conventional car. Straight result of that: electric vehicles put out 20 to 26% more tire particle emissions than gas cars.
Starting to see the problem? We’re making a pollution source worse. An electric car can weigh up to 760 kilos (about 1,700 pounds) more than its gas twin. Those extra hundreds of kilos literally crush the tires against the asphalt, which releases even more toxic particles into the environment. Add the instant torque of electric motors, full power from the first second, and you speed up the wear even more. So going electric won’t fix the emissions problem unless we take the tire question seriously. But hang on, what’s actually in a tire?
What goes into a tire is a toxic secret
Think you know what’s in your tires? Think again! A tire runs roughly 40 to 60% natural and synthetic rubber, 20 to 35% carbon black, up to 28% aromatic oil, a steel frame, heavy metals like zinc, cadmium, lead and copper, and 5 to 15% chemical additives. Laid out like that, it almost sounds manageable. The trouble starts the second you dig into the chemical additives, because we’re talking about hundreds of different substances. And here’s the scandal: tire makers don’t have to disclose everything they put in. So there are hundreds of formulas out there, each manufacturer guarding its secret recipes, because the exact formulation counts as proprietary. Nobody really knows what goes into these things.
Staggering, right? You’re driving on a chemical cocktail and nobody knows its exact composition. And the little we do know is plenty to worry about. Zinc, lead, cadmium, mercury, chromium and vanadium, for a start. Heavy metals, every one of them, every one terrible for your health. Polycyclic aromatic hydrocarbons too, the famous PAHs, known carcinogens. 6PPD is in there as well, and we’ll come back to that one because it’s the worst of the lot. Plus benzothiazoles, phthalates, sulfenamides, guanidines and thiazoles. Want me to keep going, or do you get the idea of what a tire is made of?
PAH levels in the oils can hit 300 to 700 milligrams per kilo. And it doesn’t stop there, because some of the breakdown products of these chemicals are more toxic than the original compounds. Meaning: as the tire wears and those substances break down in air and sunlight, they get more dangerous than they already were. Which brings up the real question. Where does all this poison end up?
Tires pollute the oceans and waterways on a massive scale
Brace yourself, the numbers are dizzying. Tires are the world’s second biggest source of microplastic pollution, right behind single-use plastics. Every year, 200,000 metric tons of particles wind up in seas and oceans around the globe. To give you a sense of the scale, 5 to 10% of all the plastic in marine waters comes from tires wearing down. Narrow it to primary microplastics, the ones released straight out as tiny particles instead of coming from bigger pieces breaking apart, and the figure jumps to 28%! So more than a quarter of the invisible pollution wrecking marine life comes off our tires.
How does it get all the way out there? Easy enough to follow. You drive, your tires wear, the particles drop onto the road. In cities with stormwater collection, rain carries them into the sewers. Trouble is, plenty of cities dump that stormwater straight into rivers with no treatment at all. In cities that do run it through a treatment plant, 35% of the particles slip through the filters anyway. From there they end up in irrigation water for farms and even in drinking water. On country roads, highways and anywhere without a collection system, it’s worse. There, 100% of the particles go straight into the wild the moment it rains, into ditches, fields, forests and streams. Overall, 82% of everything tires shed ends up in waterways.
One specific chemical is the real nightmare, and it’s called 6PPD-quinone. 6PPD itself is an additive in almost every tire on the road, there to keep the rubber from cracking. Problem is, when 6PPD meets atmospheric ozone, it turns into 6PPD-quinone. That stuff is lethal to certain fish. It kills 40 to 90% of the coho salmon spawning in West Coast streams. For decades scientists couldn’t figure out why those salmon died off in waves after every rainfall. A 2020 study cracked it and pinned the slaughter on 6PPD-quinone carried out of tire particles by runoff.
The same highly toxic compound also kills rainbow trout, brook trout, Arctic char and white sturgeon. Acute mortality, even at vanishingly small concentrations. Other aquatic species don’t get off either. The particles cause cell damage, hormone disruption, weakened immune systems and, eventually, death. So the water is massively contaminated, but the air you breathe is even worse.
Tire particles in the air are an invisible killer
You may have just breathed in tire particles without knowing it. Because 3 to 7% of all PM2.5 air pollution comes from tire wear. PM2.5 means particles under 2.5 micrometers across, small enough to sink deep into your lungs. And you can’t dodge them, because a single car puts out 1 trillion particles smaller than 100 nanometers for every kilometer it drives. You read that right: one trillion per kilometer!
These ultrafine particles are small enough to do what bigger ones can’t. They cross straight through lung tissue into your bloodstream. They can even get past the blood-brain barrier and reach your brain. The fallout runs wide: studies suggest links with heart problems, lung problems, developmental and reproductive damage and cancers. Lab work has also shown oxidative stress and inflammatory responses in lung tissue exposed to tire particles.
Now hold on, because here’s the most shocking number of all. In 2021, 52% of all particle pollution from road transport came from tires and brakes. More than half! Tailpipes now pollute less than tires do. The State of Global Air 2024 report (2021 data) even puts it at 8.1 million deaths a year, which makes air pollution the second leading risk factor for death worldwide. And everything points to tire wear feeding a serious share of that global toll.
A standard tire sheds 1.5 to 3 kg of rubber over its life. On an average car with tires that last 40,000 km (about 25,000 miles), that works out to roughly 200 mg of particles per kilometer. The number swings hard depending on several things: vehicle weight (electric SUVs can put out 440 to 600 mg/km), driving style (aggressive or smooth), how soft the tire is (a sport tire wears faster than a hardened long-life one) and above all the quality of the road surface. Coarse tar or concrete grinds tires down far faster than smooth asphalt, which drives particle emissions way up over the same distance. Sounds small, until you multiply it by the number of vehicles on Earth and get the size of the disaster. So the air is polluted, the water is polluted… and now guess what? Our food, inevitably, too 🙁
Tire residue is contaminating our food
Yes, you read that right. Tire residue is sitting in your salad. A University of Vienna study showed that the chemical additives in tires get taken up by vegetable roots and build up in the leaves we eat. The researchers dosed hydroponic lettuce with a little tire particulate, and the result left no room for doubt. Every chemical compound they tested was absorbed by the plants. Every single one, including the famous 6PPD and its toxic derivative 6PPD-quinone.
The same Vienna team measured real concentrations in leafy greens grown in Switzerland and Israel: 238 nanograms of benzothiazole per kilo and 0.4 nanograms of 6PPD per kilo. Depending on your diet, that means an involuntary daily intake of 12 to 1,296 nanograms of benzothiazole and 0.06 to 2.6 nanograms of 6PPD. Which is a very big problem, because no safety threshold has ever been set for these substances in food. So we swallow tire additives every day without knowing at what dose they turn dangerous for our health. How does this crap get into our vegetables? Irrigation water, obviously! Because as we saw earlier, tire particles contaminate freshwater sources and farm soil. So the chemical additives end up absorbed through plant roots.
And that’s not all! 6PPD and 6PPD-quinone showed up in the urine of 150 people tested in southern China, children, adults and pregnant women. Pregnant women carried the highest concentrations. So we literally have tire residue inside our bodies. If it’s established that humans are contaminated, what about the rest of the living world?
Tires are destroying wildlife and plant life
The damage obviously doesn’t stop at humans and fish. The whole ecosystem is getting absolutely hammered. Start with soil. Tire particles contaminate it and wipe out the organisms that matter, microbes and worms. Those same bacteria and worms are the ones that aerate the dirt and make the nutrients plants need to grow. Lose them and the soil packs down tighter and holds water worse.
The plants take the hit directly. Tire particles stunt root and shoot growth in a long list of crops: mung beans, soy, leeks, wheat. Our food crops grow worse because of tires. As for marine life, we’ve already talked about it. But it goes further. The particles also contaminate marine copepods, the tiny crustaceans holding up the entire ocean food chain. Kill the copepods and you kill everything that eats them, then everything that eats the things that eat them… and so on to the top of the food chain. The higher you climb, the more the concentration builds. So guess who ends up with the biggest dose?
Burning tires is a health and environmental disaster
A burning tire is a straight-up chemical apocalypse. Set one on fire and it releases a cocktail of highly toxic substances. Among the poisons: dioxins, furans, polycyclic aromatic hydrocarbons, PCBs, hydrogen chloride and benzene. Plus a whole range of heavy metals, cadmium, nickel, zinc, mercury, chromium and vanadium.
The measured pollution levels are beyond belief. One study clocked an average PM10 concentration of 280 micrograms per cubic meter over 24 hours of burning, 7 times the ambient air measured at the same spot before the fire. Total PAH concentration hit 2,918 micrograms per cubic meter. Sulfur dioxide emissions ran 3 times over EPA limits. That is appalling.
A tire fire easily tops 1,000°C (about 1,830°F). Water or foam is usually completely useless against it, and the only thing that works is burying the tires under dirt or sand. And the worst part is that some tire fires have burned nonstop for months. Take Virginia in 1983, where 7 million tires went up and threw a smoke plume 900 meters (3,000 feet) high that stretched 80 kilometers (50 miles). It burned for 9 months and contaminated every water source around it with lead and arsenic. People who caught heavy involuntary doses of dioxins and furans came out of it with chloracne (a horrible skin disease), liver trouble and elevated blood lipids.
So let’s be very clear about this. Until the tire composition problem gets fixed, the least we can do is not make it stupidly worse. Protesting is a fundamental right, and being angry at injustice is legitimate and even necessary. But burning tires at a demonstration is criminal for the environment and dangerous for your health and everyone else’s. If you want to fight for a just cause, don’t wreck the planet while you’re at it, because there are other ways to be heard. Meanwhile, if burning tires is that bad, we can always just let them rot away, right?
Abandoned tires pollute for centuries
Bad news, it’s not really better! A standard tire takes 50 to 80 years to break down in typical landfill conditions. Fifty to eighty years is already enormous. But some studies suggest certain types of tire could need up to 2,000 years to decompose completely. Two thousand years! Your car’s tire will still be sitting there long after your great-great-great-great-grandchildren are gone.
How many tires are lying around the planet right now? Four billion used tires are piled up in landfills and stockpiles worldwide, 2 billion of them in the United States alone. And they don’t sit there politely inert while they wait to decompose. A tire left in the sun leaks methane into the atmosphere, a greenhouse gas far more powerful than CO2. The heavy metals and chemicals inside leach out little by little and contaminate the soil and the groundwater.
Just leaving tires on the ground for a while is enough to wipe out the beneficial bacteria in the soil, which keeps plants from growing properly. So those brilliant Pinterest and Insta ideas about turning old tires into planters? Forget it. Another major problem gets nowhere near enough attention. Abandoned tires make perfect mosquito nurseries, because they collect rainwater and create little stagnant pools that are ideal for larvae. The result is a spread of diseases like West Nile virus, dengue, malaria and encephalitis.
In Europe, 95% of end-of-life tires get collected for recycling, which looks encouraging on paper. But let’s dig into what “recycling” actually means. In reality, 55% get turned into recoverable material and 40% get burned for energy recovery. Nearly half still end up as fuel for cement plants and other polluting industries. The rest gets ground into rubber crumb for synthetic sports fields, children’s playground surfaces or mixed into asphalt. Trouble is, those uses just scatter the toxic particles somewhere else. Tire-crumb sports fields are getting more and more controversial over their health risks. The gaps between European countries are huge too, some hit 90% recycling while others stall at 60%. And some people are even thinking about recycling tires into building material. Which opens a whole other set of problems, coming up next.
Building with tires carries toxic risks
Earthships use dirt-packed tires as building material. On paper it looks smart, you reuse something and keep it out of a landfill. On the ground it’s a lot messier, because tires don’t shed their toxicity once they’re buried in a wall. They keep releasing toxic substances into your indoor air. The carbon black that comes off over time is classed as a known carcinogen by NIOSH. Zinc oxide can be inhaled as particles and bring on chills, fever, chest tightness and coughing.
Green building and indoor air quality specialists are unambiguous: don’t use tires to build a home. Why? Because over time the offgassing works its way through the earth layers and the plasters that are supposed to seal it in. Those volatile substances don’t stay politely stuck behind your wall, they migrate through porous material bit by bit. And the offgassing keeps going for years. Wall coatings also degrade with age, which lets tire particles escape both inside and out. End result, your supposedly green house contaminates your indoor air and your vegetable garden.
And this isn’t just theory or hypothesis. Several people have developed allergies they didn’t have before living in Earthships. Some moved out and got their health back after a while. Coincidence? Maybe, maybe not. Some countries have flat-out banned tires in buildings. In Belgium, Earthship builders now use earthbags instead of old tires. Sacks you fill with dirt. But careful! Polypropylene (plastic) bags aren’t much better than tires from an environmental standpoint. Natural fiber bags, hemp or burlap, are an excellent alternative. Building with them just takes a specific technique.
At NovaFuture our position is clear, and we apply the precautionary principle. Tires are highly toxic, so why take the slightest risk of contaminating your home? Especially a place where you spend a third of your life and where your kids grow up. And clean alternatives exist, and they work perfectly well. So use those instead of taking pointless risks. Now, with all these dangers scientifically proven and thoroughly documented, what is the tire industry doing about it?
The tire industry dodges all regulation thanks to lobbying
Here we get to the heart of the scandal and the real question, the one nobody wants asked. Why does nothing move, with all this damning evidence on the table? The answer is simple and it fits in one word: money! The global tire industry is worth $180 billion a year. A hundred and eighty billion! No need to spell out that with that kind of firepower you can swing a lot of political decisions and kill off a lot of inconvenient regulation.
Tire manufacturers have stepped up their lobbying of European Union lawmakers who are considering tighter rules on tire wear. Why put that much effort into blocking them? Because those rules could cost them billions in product redesign. And their tactics are, to stay polite, pretty creative. The European tire manufacturers’ lobby commissioned a study that conveniently concludes most tire particles never reach rivers and oceans. These people were born before shame was invented!
And it goes further! They hired a consulting firm that specializes in defending corporations against chemical exposure claims. Two former employees of that firm said something revealing, on condition of anonymity. Quote: “If we found anything that made our client look bad, we wouldn’t publish it.” You read that right, rigged studies to protect tire industry profits.
The payoff for all that lobbying? No specific regulation exists on tire wear rates, and oversight of the chemicals used in production is extremely thin. Not one existing rule directly addresses what tire wear particles do to the environment. Line that up against what comes out of a tailpipe and you get a clear double standard. Tailpipe emissions have been studied at length and ultra-regulated for decades. Tire and brake emissions are much harder to measure and control, so we let them slip past regulation entirely.
Meanwhile the world produces 3 billion new tires every year, and that number only climbs. But a few timid moves are starting to surface here and there. The environmental group Earthjustice filed a notice of intent to sue tire manufacturers for violating the Endangered Species Act over their use of 6PPD. A new California law now requires tire makers to look into alternatives to harmful additives like 6PPD. But at a global level, or even a federal one? Nothing at all.
Conclusion – It’s high time to act!
We’re not saying go back to wooden wheels. We’re not morons preaching a return to the Stone Age, and we know perfectly well that transportation needs tires. What we’re calling out is the total absence of environmental effort from a sector poisoning the planet with complete impunity. And that the tire sector answers to nobody on what goes into its products, when it’s a major public health issue.
So if you also think this can’t stay buried any longer, share this article far and wide and push it out on every social network you’re on. The more of us talking about it and passing it along, the harder it gets for the industry and the politicians to look away and keep pretending everything’s fine. Silence kills, so let’s all be our own media outlet.
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