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Rising Seas and Roadway Debris: Microplastic and Low-Density Tire Wear Particles in Street-Associated Tidal Floodwater
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Rising seas and roadway debris: Microplastic and low-density tire wear particles in street-associated tidal floodwater
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Researchers measured microplastic concentrations in tidal floodwater in Charleston, South Carolina, finding an average of 342 +/- 60 MP/L, with tire wear particles among the most common types. Rising sea levels are increasing the frequency of tidal flooding events that transport street-associated microplastics into coastal ecosystems.
Sourcing, Timing, and Extent of Microplastic Mobilization by Urban Flooding
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Researchers studied how urban flood events mobilize microplastics stored in urban watersheds, finding that storm flooding dramatically increases the transport of accumulated plastic particles into waterways and downstream environments. As climate change intensifies urban flooding frequency, understanding microplastic mobilization dynamics is critical for predicting pollution loading into aquatic ecosystems and designing stormwater management systems that reduce plastic discharge.
Tire-wear Particles as a Major Component of Microplastics in the Environment
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Researchers analyzed non-exhaust traffic particles along busy German roads using microscopy and SEM-EDX, finding that tire-wear particles dominate coarse airborne particulate matter and accumulate additional hazardous metals from brake and road abrasion, making them a major and chemically complex microplastic pollutant in aquatic environments.
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.
Microplastics in Urban Environments: Sources, Pathways, and Distribution
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Researchers mapped the major sources and pathways of microplastic pollution in cities, finding that tire wear, laundry wastewater, landfills, and construction activity collectively make urban areas major generators of the microplastics that flow into surrounding air, water, and soil.
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