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Wear and Tear of Tyres: A Stealthy Source of Microplastics in the Environment
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This paper compiles existing knowledge on tire wear as a major but often overlooked source of microplastics, estimating global per-person emissions at about 0.8 kilograms per year. Tire particles enter waterways, air, and soil, with an estimated 5-10% of ocean plastic pollution originating from tire wear. The study calls for increased awareness and creative solutions to address this stealthy yet substantial contributor to microplastic contamination.
Wear and tear from tyres significantly contributes to the flow of (micro-)plastics into the environment. This paper compiles the fragmented knowledge on tyre wear and tear characteristics, amounts of particles emitted, pathways in the environment, and the possible effects on humans. The estimated per capita emission ranges from 0.23 to 4.7 kg/year, with a global average of 0.81 kg/year. The emissions from car tyres (100%) are substantially higher than those of other sources of microplastics, e.g., airplane tyres (2%), artificial turf (12-50%), brake wear (8%) and road markings (5%). Emissions and pathways depend on local factors like road type or sewage systems. The relative contribution of tyre wear and tear to the total global amount of plastics ending up in our oceans is estimated to be 5-10%. In air, 3-7% of the particulate matter (PM2.5) is estimated to consist of tyre wear and tear, indicating that it may contribute to the global health burden of air pollution which has been projected by the World Health Organization (WHO) at 3 million deaths in 2012. The wear and tear also enters our food chain, but further research is needed to assess human health risks. It is concluded here that tyre wear and tear is a stealthy source of microplastics in our environment, which can only be addressed effectively if awareness increases, knowledge gaps on quantities and effects are being closed, and creative technical solutions are being sought. This requires a global effort from all stakeholders; consumers, regulators, industry and researchers alike.
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This study analyzed tire wear particles as a major source of microplastics in the environment, estimating that tire abrasion contributes a substantial fraction of total microplastic emissions globally and highlighting road runoff as a key delivery pathway to waterways.
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This review provides an overview of tire road and wear particles as a major source of microplastic emissions, examining both experimental and mathematical approaches to measuring tire wear. The study notes that while tire wear particles are found in alarming amounts across various environments, they remain less studied than other microplastics, and calls for more accurate simulation models to predict tire wear emissions.
Wheels of Contamination: Car tire microplastics from source to sea
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Researchers traced the pathway of car tire microplastics from their origin on road surfaces through environmental transport routes to marine deposition, estimating that over 55 million kilograms of tire wear particles enter aquatic environments annually. The study synthesized evidence on emission rates, transport mechanisms, and ecological risks associated with tire-derived microplastics reaching the sea.
Contribution of Road Vehicle Tyre Wear to Microplastics and Ambient Air Pollution
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This review finds that tire wear from road vehicles contributes one-third to one-half of all microplastics released unintentionally into the environment, with passenger cars generating about 110 milligrams per kilometer driven. Most tire particles end up in soil, but a portion becomes airborne, contributing 5-30% of road transport particulate matter emissions. Since the smallest tire particles can be inhaled, this is a significant and often overlooked source of daily microplastic exposure for people living near roads.
Vehicle tyres - A key source of microplastics to the environment: Fate, effects, and mitigation strategies
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Every time your car tires touch the road, they shed tiny plastic particles that end up in our air, water, and soil, making tires one of the biggest sources of microplastics in the environment. This review pulls together existing research on where this tire dust ends up and how it affects living things, and while more research is still needed on human health risks, it's a reminder that even routine driving contributes to the plastic pollution we're increasingly breathing in and consuming.
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