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Relevance of Tyre Wear Particles to the Total Content of Microplastics Transported by Runoff in a High-Imperviousness and Intense Vehicle Traffic Urban Area
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Transport of Traffic-Related Microplastic Particles in Receiving Water
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Traffic-generated microplastic particles, primarily from tire wear and road markings, are transported via stormwater runoff into urban waterways and ultimately marine environments, making roads a significant but underappreciated land-based source of ocean microplastic pollution. Quantifying this transport pathway is essential for developing effective urban stormwater management strategies to reduce microplastic loads in receiving waters.
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Researchers characterized microplastics and tire wear particles (TWPs) transported by urban stormwater runoff in a highly impervious catchment, finding that TWPs made up a substantial fraction of the total microplastic load in sediments of a stormwater detention reservoir. The study underscores the contribution of road traffic to microplastic pollution entering waterways.
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Tiny plastic fragments that accumulate on roads get swept into rivers and lakes when it rains, especially during heavy storms, on flatter roads, and when smaller fragments are involved, according to this study. This matters because these plastics eventually end up in the water bodies that supply our drinking water and support fish and wildlife, and understanding how rain washes them away can help cities design better filtering systems to catch them before they spread further into the environment.
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