New research shows that the microscopic particles released as tires wear down can travel from roads into waterways and eventually be eaten by marine organisms. The study highlights how everyday driving can contribute to a less visible form of microplastic pollution with ecological consequences.
Scientists examined both fresh and weathered tire particles, along with the chemicals they release into water, to better reflect real environmental conditions. They tested inland silverside fish and mysid shrimp in early life stages, then measured ingestion, growth, and behavior. The findings, published in Environmental Pollution, showed that weathered particles were more readily consumed and had stronger effects on growth in both species.
The research also found that tire debris can alter behavior in species that sit low in the food web. Fish and shrimp responded differently depending on whether the particles were pristine or weathered, suggesting that vulnerability changes with species and exposure type. Because mysid shrimp are an important food source for larger marine animals, the impact may ripple upward through the ecosystem.
Researchers note that tire particles contain a complex mix of materials, including additives such as 6PPD, and that stormwater runoff can carry them from roads into rivers and estuaries. Some teams are now exploring better tire formulations, stormwater traps, and vehicle-based capture systems to reduce the spread of these particles.
The study adds a practical layer to microplastics science by focusing on the particles organisms actually encounter in nature. It points toward cleaner transport materials and smarter runoff control as part of the environmental solutions of the future.
