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Beyond Microplastics: How Tire Wear Particles Influence Plant Performance
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Scientists reviewed research on tiny particles that come off car tires when we drive, which end up in soil everywhere and are different from regular plastic pollution. These tire particles release toxic chemicals that can harm plants by damaging their roots and changing the soil around them, which could affect our food supply. This matters because tire pollution is everywhere but has been overlooked compared to other types of plastic pollution, and we need more research to understand the long-term risks to crops and ecosystems.
Tire wear particles (TWPs), a major source of microplastic pollution, are mainly released in soils. TWPs are rubber-mineral composites that release evolving mixtures of metals, polycyclic aromatic hydrocarbons, and reactive additives and transformation products (e.g., N-(1,3-dimethylbutyl)-N-phenyl-p-phenylenediamine-quinone). Unlike polymer-based microplastics, both TWP particle properties and leachate composition change with aging, potentially causing nonlinear toxic effects on ecosystems. Though TWPs are ubiquitous in terrestrial environments, their impacts on plant performance cannot be extrapolated from polymer-focused microplastic research. Here, we synthesize emerging evidence and propose a plant-centric, eco-evolutionary framework to explain how TWPs influence plants through soil-rhizosphere pathways. We emphasize three connected paradigms: (i) disentangling particle-driven physical effects on soil structure and root habitats from leachate-mediated chemical stress; (ii) integrating plant physiology, soil biogeochemistry, and pollutant chemistry to capture rhizosphere "hotspots" and microfood-web responses; and (iii) linking mechanistic understanding to exposure modeling, risk assessment, and policy. We organize TWP impacts as an inputs-processes-outputs chain, where dynamic exposure inputs (particle traits, mixtures, aging state, root-particle contact, etc.) regulate processes (chemical mobilization, microenvironment change, biotic interactions, etc.) and shape plant performance and plant-soil feedbacks. We propose testable hypotheses, including that weathering shifts dominant impacts from particle to leachate pathways and that root-particle interfaces create localized exposure gradients that restructure nutrient coupling and plant-microbe interactions. Finally, we outline research priorities such as aging-dependent and long-term assessments and interactions with co-occurring pollutants and global-change drivers to accelerate predictive understanding of TWP risks to soil-plant systems.
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Tire wear particles: An emerging threat to soil health
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This review synthesizes knowledge about tire wear particles — a major but often overlooked source of microplastic-like pollutants — in soil ecosystems. Tire wear particles contain toxic metals and organic compounds that harm soil microbes, invertebrates, and plants, but most research to date has focused on aquatic systems rather than soils.
Tire wear particles: An emerging threat to soil health
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This review examines tire wear particles as an emerging source of soil contamination, finding that these microplastics contain a complex mixture of rubber, metals, and organic chemicals that can harm soil organisms. Researchers highlight that most current studies focus on individual species, which may underestimate the cascading effects on entire soil ecosystems. The study warns that tire wear particles could alter essential soil processes and ecosystem services, representing a significant but underappreciated threat to soil health.
Tire abrasion particles negatively affect plant growth even at low concentrations and alter soil biogeochemical cycling
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Researchers found that tire abrasion particles—a major source of microplastic pollution on land—negatively affected plant growth and disrupted soil nutrient cycling even at low concentrations. This is concerning because tire particles are shed in enormous quantities on roads and accumulate in roadside soils where plants grow.
Tire/Tyre Wear Particles in the Terrestrial Environment: A Critical Scoping Review
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Every time tires roll on pavement, they shed tiny particles that end up in soil, dust, and waterways—and this review pulls together five years of research on where these particles go and what harm they might cause. While scientists are still working out the full health picture, tire particles are known to carry chemicals linked to toxicity in animals and plants, raising concern about long-term human exposure through air, soil, and food chains. The takeaway: this is a fast-growing pollution source that needs better tracking and stronger policies, since we're still in the early stages of understanding how it could affect our health.
Tire abrasion particles negatively affect plant growth even at low concentrations and alter soil biogeochemical cycling
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Tire wear particles at environmentally relevant concentrations reduced plant growth, lowered seed germination rates, and altered soil nitrogen and carbon cycling biogeochemical processes even at the lowest doses tested, suggesting that tire-derived microplastics pose a real risk to terrestrial plant productivity and ecosystem function.
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