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Are eco-friendly “green” tires also chemically green? Comparing metals, rubbers and selected organic compounds in green and conventional tires
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Researchers chemically analyzed nine "eco-friendly" green tires alongside seven conventional tires and found no significant difference in their hazardous chemical content — in fact, green tires contained on average nearly twice as much of the harmful additive 6PPD. The study suggests that marketing a tire as sustainable does not necessarily mean it releases fewer toxic chemicals into the environment.
Tires are a major source of synthetic and natural rubber particles, metals and organic compounds, in which several compounds are linked to negative environmental impact. Recent advances in material technology, coupled with focus on sustainability, have introduced a new range of tires, sold as "green, sustainable, and eco-friendly". Although these "green" tires may have lower impact on the environment on a global scale, there is no current knowledge about the chemical composition of "green" tires, and whether they are more eco-friendly when considering the release of tire wear particles or tire-associated chemicals. Here we have investigated the chemical composition of nine "green" vehicle tires, one "green" bike tire and seven "conventional" vehicle tires. No significant difference was found between "green" and "conventional" tires tested in this study. For N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine (6PPD), the average concentration in "green" tires were higher (16 ± 7.8 µg/mg) compared to "conventional" tires (8.7 ± 4.5 µg/mg). The relationship between metals, selected organic compounds and rubbers demonstrated large variation across brands, and lower variability between tires grouped according to their seasonal use. This study indicates that more work is needed to understand how the shift towards sustainable tires might change the chemical composition of tires.
More Papers Like This
Is recycling sustainable: The promise and risks of scrap tire valorization
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Every year, 1.5 billion old tires need to be dealt with, and while recycling them sounds like a clean solution, this review of existing research shows it's more complicated: breaking down tires can release harmful chemicals like microplastics, heavy metals, and a toxic byproduct called 6PPD-quinone into the environment. These pollutants can build up in soil, water, and air, raising long-term health and environmental concerns, meaning the recycling methods meant to help the planet may need better safety regulations and monitoring before they're truly sustainable.
Retreaded tires are an overlooked source of microplastics with distinct additive leaching and ecotoxicity
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Researchers found that tire wear particles from retreaded tires leach additives — especially the highly water-soluble p-phenylenediamine IPPD — at markedly higher rates than new or used tires, causing greater toxicity to bacteria and algae, with global emissions projected to increase several hundred-fold by 2060.
Tire and Road Wear Particles as Vectors of Hydrophobic Tire Additives: Quantifying Contributions to Chlorinated Paraffins in Urban Road Environments
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Tiny particles worn off tires as they roll on roads aren't just plastic pollution — they also carry chemical additives called chlorinated paraffins, which are used in tire manufacturing and linked to health concerns. Researchers found these chemicals in road dust and roadside soil at levels showing that tire particles are a major source, contributing anywhere from 5% to over 44% of these chemicals depending on the location. Since this dust settles in places where people live, work, and play, it means tire wear may be spreading potentially harmful chemicals through our everyday environment more than previously realized.
Study on the ecotoxicological effects of airplane tire wear particles versus automobile tire wear particles on earthworms
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Researchers compared the toxicity of airplane and automobile tire wear particles in earthworms, finding that airplane-derived particles caused more severe antioxidant enzyme suppression, intestinal tissue damage, and gut microbial diversity loss — with LC-MS toxicity profiling identifying 6PPD, RD, and DCH as the highest-risk compounds driving these effects.
Recycled tire rubber materials in the spotlight. Determination of hazardous and lethal substances
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Researchers analyzed crumb rubber from recycled tires used in artificial turf fields and playgrounds and found hazardous chemicals including 6PPD, a compound whose breakdown product (6PPD-quinone) is lethal to certain fish species. All 40 crumb rubber samples contained these toxic substances, while alternative infill materials like cork and sand were much safer. This is concerning because crumb rubber is itself a microplastic material, and children playing on these surfaces are directly exposed to both the particles and the chemicals they contain.
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