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The need for environmental regulation of tires: Challenges and recommendations
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Researchers analyzed global regulations affecting tires across their entire lifespan and found a significant gap: while many rules address tire chemicals, safety, and recycling, none specifically regulate tire wear particles (TWPs) — the microplastic-like fragments shed onto roads. The authors argue that TWPs represent a poorly controlled source of environmental contamination and call for new risk-based regulations targeting their emission and toxicity.
The interest in tire wear particles (TWPs), generated from abrasion of tires, have gained traction over the past few years, both in regards to quantifying particulate emissions, leaching of different compounds, toxicity, and analytical methods. The life of a tire, from cradle to end-of-life, crosses over different scenarios during its lifetime and transcends environmental compartments and legislative areas, underlining the need for a collective approach. Sustainability for a tire encompasses the use of raw materials, recycling of raw materials, circular economy and material sourcing. The tire industry is currently making significant efforts towards a greener and more sustainable production considering reduction of CO2-emissions, recycling, material sources and implementing the use of biomass from plants rather than oil-derived alternatives. In this paper, we aim to analyze and discuss the need for environmental regulation of tires in order to provide a series of targeted recommendations for future legislation. Our study shows that the numerous regulations related to tires focus on chemicals, manufacturing, raw materials, use of tires on roads, waste handling, safety and polycyclic aromatic hydrocarbons (PAHs) in different life cycle stages of a tire. However, none directly addresses the contribution of TWPs to the environment. Despite the overall good intentions of the existing regulations, there is a lack of focus on the compounds that partition from the tire and disperse in the environment, their mixture effects, and the transformative products from the parent compounds in the environment. Therefore, a renewed focus is needed on risk assessment of complex mixtures like TWPs. Thus, transparency in regard to use of chemicals in TWP, mixtures, minimization of emissions, and capture of particulate pollution should be a priority.
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Researchers reviewed available science on tire wear particles (TWP) — tiny fragments shed from tires during driving — finding that Europe alone generates over 1.3 million tonnes per year, but critical data on environmental concentrations, transport to waterways, and aquatic toxicity remain too limited for robust ecological risk assessment.
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Researchers reviewed the current state of knowledge on tyre wear particles — rubber fragments shed by vehicles that are a major source of microplastic pollution — identifying key gaps in emissions estimates, detection standards, and understanding of the toxic chemicals that leach from tyre rubber into the environment. The review calls for closer collaboration between scientists, regulators, and the tire industry to develop solutions that reduce the environmental and health impacts of tyre pollution.
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Researchers developed a comprehensive approach to estimate national tire wear emissions, which are a major source of microplastics in the environment. They found that increasing vehicle weight due to electrification trends and growing traffic volumes are driving higher emissions, while no regulations currently exist for tire wear. The study provides methods needed for tracking changes in tire-related microplastic pollution and supporting future environmental impact assessments.
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