We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Urban road dust as a dynamic reservoir for microplastics: Quantifying precipitation washout, recovery patterns, and traffic influence in Bahía Blanca, Argentina
AI summary Read the abstract
Researchers tracked microplastics in urban road dust in Argentina before and after a 26 mm rainfall event, finding that paved surfaces lost 44% of accumulated particles while unpaved surfaces shed only 14%, and that tire wear particles dominated paved roads while fibers prevailed on unpaved surfaces — demonstrating that surface type and driving behavior, not just traffic volume, govern how MPs are mobilized and transported to nearby estuaries.
Microplastics in urban road dust remain poorly understood in South America. This study investigated microplastic dynamics in Bahía Blanca, Argentina, examining precipitation effects, surface type, and traffic influence over three days (n = 30 samples). Particles (1-5000 μm) were recovered through density separation (1.2 g/cm NaCl solution), with visual identification limited to particles ≥50 μm using stereomicroscopy, supplemented by ATR-FTIR and micro-Raman spectroscopy for polymer characterization. Microplastics were detected in 100% of samples from paved and unpaved roads, with mean concentrations of 1,526 ± 795 MP/kg. A 26 mm precipitation event mobilized 31.9% of accumulated particles, with marked differences between paved surfaces (43.5% washout, 50.9% recovery) and unpaved surfaces (13.5% washout, 5.2% recovery), demonstrating surface-specific particle mobility. Morphological analysis revealed distinct contamination sources: tire wear particles (TWP) dominated paved roads (37.2%), while fibers prevailed on unpaved surfaces (67.9%). The non-linear relationship between traffic and TWP distribution-with a low-traffic parking area (26 vehicles/hour) showing higher TWP proportions (60.3%) than high-traffic sites (1,784 vehicles/hour, 36.4%)-reveals that local generation-resuspension balance depends on driving patterns and atmospheric conditions rather than traffic volume alone. Spectroscopic identification confirmed common polymers (PET, PP, PE, PA) and textile-associated pigments (copper phthalocyanine 32.8%, indigo 10.0%). The 250-500 μm size fraction (21.6% of particles) represents particular concern for resuspension and transport. Results demonstrate that urban dust operates as a dynamic microplastic reservoir, mobilized through hydrological and atmospheric pathways, with implications for stormwater management and estuarine pollution, as road dust particles are ultimately transported to the Bahía Blanca Estuary through precipitation runoff.
More Papers Like This
Relevance of tyre wear particles to the total content of microplastics transported by runoff in a high-imperviousness and intense vehicle traffic urban area.
AI summary Read the abstract
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.
Is road pavement wear a source of microplastics in stormwater runoff?
AI summary Read the abstract
This study investigated whether road pavement wear is a measurable source of microplastics in stormwater runoff, distinct from the better-characterized tire wear contribution. Pavement-derived particles were identified in stormwater samples, confirming that road surface material itself contributes to microplastic loading in urban runoff alongside tire wear and other sources.
Microplastics and tyre wear particles in urban runoff from different urban surfaces
AI summary Read the abstract
Researchers measured microplastics and tire wear particles in stormwater runoff from roads, parking lots, and rooftops in Sweden. They found that road runoff carried the highest concentrations by far, with large variations between rainfall events. The findings highlight urban roads as a major source of microplastic pollution entering nearby waterways through stormwater.
Occurrence and risk associated with urban road-deposited microplastics
AI summary Read the abstract
Researchers collected and analyzed microplastics deposited on urban roads and found average concentrations ranging from 0.33 to 3.64 grams per square meter, with significant variation based on land use and particle size. Road-deposited microplastics were mainly fibers and fragments from tire wear and textile sources, and their risk assessment indicated moderate ecological concern. The study provides new insights into how different urban environments contribute to microplastic pollution through road runoff.
Contributing to the assessment of the impact of urban activities on microplastic transport through air and runoff infiltration
AI summary Read the abstract
Researchers investigated the contribution of urban activities to microplastic transport through both airborne pathways and stormwater runoff infiltration, quantifying plastic particle fluxes in an urban watershed. The study found that road surfaces, construction materials, and tire wear were significant urban sources, with rainfall events mobilizing microplastics into both air and subsurface water.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.