Tire Wear Particles: The Pollution Source Hiding in Plain Sight
Tire Wear Particles
Tire and brake wear now account for close to 60% of road transport particulate pollution in the United States, a share that has grown quietly as tailpipe emissions have been engineered down toward negligible levels.
The particles themselves are a mix of synthetic rubber fragments, fillers and road debris. Roughly 6 million tons are released globally each year, making up 5–10% of ocean microplastics and 3–7% of airborne particulate matter.
The Scale of the Inversion
Studies cited by researchers put tire particle emissions at up to 1,850 times those of vehicle exhaust. Per kilometre driven, tires shed around 36 milligrams of particles; a modern tailpipe fitted with a gasoline particulate filter can emit as little as 0.02 milligrams over the same distance.
The finest fraction is the most troubling. Particles below 23 nanometres can travel deep into the body and reach organs through the bloodstream, which is why non-exhaust emissions have moved up the research agenda.
In urban air, tire particles can represent 3–7% of PM2.5. Much of the remainder does not stay airborne at all — it settles into soils and waterways, and eventually contributes to the microplastic burden in the oceans, where tire material is estimated at 5–10% of the total and can enter the food chain.
Brakes Add to the Load
Work by the California Air Resources Board found brake wear particulate emissions ranging from 3.3 to 13.6 milligrams per mile, varying with vehicle type, brake material and driving conditions.
Together, tire and brake wear are now treated as critical non-exhaust sources, with growing attention paid to what they mean for communities living close to busy roads.
Chemistry, not Just Dust
Findings from the Environmental Protection Agency have sharpened concern about specific substances carried in tire debris. 6PPD-quinone is the best-known example: highly toxic in aquatic systems and linked to mass die-offs of coho salmon in the Pacific Northwest.
The pressure is unlikely to ease. As heavier, higher-torque electric vehicles take a larger share of the fleet, tire wear may increase even as exhaust emissions disappear entirely.
What It Means for Waste Strategy
Tire wear reframes the end-of-life tire problem. The material is not only a disposal liability once the tire is scrapped — it is shedding into the environment across its whole service life. That strengthens the case for recovering value from the tires that do reach collection, and for keeping their carbon and oil fractions inside a closed loop instead of landfill, stockpiles or open burning.
Close the Loop on Tires before They Become Pollution
Every tire that is properly collected and processed is one that will not sit in a stockpile leaching chemistry into soil and water. Advanced pyrolysis recovers carbon black, oil, steel and gas from that stream and returns them to industry as products rather than emissions.
Klean Industries delivers these plants on a KBR turnkey basis — performance-guaranteed, 100% bankable, and structured so the owner is not carrying technology risk. Our references are commercial-scale and operating, including a recovered carbon black facility in Poland.
You can license the technology and build it yourself, or have us deliver the facility turnkey and hand it over in production. Either route starts with a conversation about your tire volumes and local regulation.
Contact Klean Industries » GO.
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