Weathered tire dust becomes more toxic and reactive over time
Fang Y, Hou J, Liu J, Tang KHD, Ouyang Z
Soil Health
If you garden near a busy road or your beds catch runoff from a driveway, the black rubber crumbs washing into your soil aren't inert: as they age in sun and rain they get more porous and chemically reactive, making it easier for them to leach additives or bind other pollutants right where your plants' roots are.
Tire dust from cars and trucks is one of the biggest sources of microplastic pollution, and this review looked at what happens to that dust after it sits outside in sun, rain, and traffic abrasion for a while. The aged particles develop more surface area and chemical reactivity, which means they're better at both absorbing pollutants from their surroundings and releasing their own chemical additives. That combination makes weathered tire particles more of a hazard to soil life and waterways than fresh ones.
Key Findings
Environmental aging (photooxidation, mechanical abrasion, biodegradation) increases tire wear particle surface area, polarity, and fragmentation into smaller pieces
Aging alters how particles adsorb and release contaminants, and speeds up diffusion-controlled leaching of embedded chemical additives
Aged particles can generate environmentally persistent free radicals that produce reactive oxygen species, amplifying chemical and biological reactivity
chevron_right Technical Summary
Tiny bits of worn tire rubber break down further as they weather in the environment, becoming more likely to release toxic chemicals and pick up (or shed) other pollutants, which raises risks for soil, water, and the organisms living in them.
Abstract Preview
Original paper
Deciphering the aging-driven transformation of tire wear particles: Reshaping adsorption, leaching dynamics, and biointerfacial impacts.
Tire wear particles (TWPs) are a major source of microplastic pollution, yet their environmental behavior and risks remain insufficiently understood, particularly under environmental aging. This re...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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