We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Occurrence of tire and road wear particles in urban and peri-urban snowbanks, and their potential environmental implications
Summary
Researchers analyzed urban and peri-urban snowbanks in Norway and found significant concentrations of tire and road wear particles, confirming roads as a major source of microplastic pollution. The study is among the first to measure mass concentrations of these particles in snow, providing important data on how they accumulate and are transported in cold climates. The findings suggest that snowmelt may carry substantial loads of tire-derived microplastics into waterways each spring.
According to estimates put forward in multiple studies, tire and road wear particles are one of the largest sources to microplastic contamination in the environment. There are large uncertainties associated with local emissions and transport of tire and road wear particles into environmental compartments, highlighting an urgent need to provide more data on inventories and fluxes of these particles. To our knowledge, the present paper is the first published data on mass concentrations and snow mass load of tire and polymer-modified road wear particles in snow. Roadside snow and meltwater from three different types of roads (peri-urban, urban highway and urban) were analysed by Pyrolysis Gas Chromatography Mass Spectrometry. Tire particle mass concentrations in snow (76.0-14,500 mg/L meltwater), and snow mass loads (222-109,000 mg/m2) varied widely. The concentration ranges of polymer-modified particles were 14.8-9550 mg/L and 50.0-28,800 mg/m2 in snow and meltwater, respectively. Comparing the levels of tire and PMB particles to the total mass of particles, showed that tire and PMB-particles combined only contribute to 5.7% (meltwater) and 5.2% (mass load) of the total mass concentration of particles. The large variation between sites in the study was investigated using redundancy analysis of the possible explanatory variables. Contradictory to previous road studies, speed limit was found to be one of the most important variables explaining the variation in mass concentrations, and not Annual Average Daily Traffic. All identified variables explained 69% and 66%, for meltwater and mass load concentrations, respectively. The results show that roadside snow contain total suspended solids in concentrations far exceeding release limits of tunnel and road runoff, as well as tire particles in concentrations comparable to levels previously reported to cause toxicity effects in organisms. These findings strongly indicate that roadside snow should be treated before release into the environment.
Sign in to start a discussion.
More Papers Like This
Characterisation and spatial distribution of tyre wear particles in Swedish highway snow: Loads into roadside ditches and risk of emissions with snowmelt
Researchers measured tire wear particles (TWPs) — a major but underappreciated source of microplastic pollution — in snow alongside a Swedish highway and found concentrations up to 1,300 mg/L, with particles decreasing in concentration farther from the road. Because large amounts of TWPs can be rapidly released into waterways when snow melts, the study calls for better snow management practices to prevent this pulse of microplastic contamination.
Microplastics (MPs) in urban roadside snowbanks: Quantities, size fractions and dynamics of release
Tire wear particles and road wear particles were found to dominate microplastic contamination in urban roadside snowbanks in northern Sweden, with MPs detected across multiple size fractions. The study documented a large pulse of MP release when snowbanks melt in spring, identifying snowmelt as a seasonal point source of microplastics entering urban waterways.
Traffic Intensity as a Factor Influencing Microplastic and Tire Wear Particle Pollution in Snow Accumulated on Urban Roads
This study examined how traffic volume influences microplastic and tire wear particle (TWP) concentrations in snow accumulated on urban roads in a medium-sized Polish city. Higher traffic intensity corresponded with significantly greater microplastic and TWP concentrations, confirming roads as major point sources of synthetic particle pollution in urban snowpack.
Traffic Intensity as a Factor Influencing Microplastic and Tire Wear Particle Pollution in Snow Accumulated on Urban Roads
A study in a medium-sized Polish city found microplastics and tire wear particles at all 53 road sites examined, with concentrations in road snow scaling strongly with traffic volume — from roughly 62 particles per liter on quiet streets to nearly 793 on heavy-traffic roads. Snow acts as a temporary reservoir, concentrating these particles through winter before releasing them in large pulses into rivers and streams during spring melt. The findings suggest that reducing traffic speeds, sweeping roads regularly, and installing stormwater filters are practical measures to limit urban microplastic runoff.
Microplastic and tyre wear particles at a highway: a case study from Norway
Researchers monitored microplastics and tire wear particles (tiny rubber fragments shed by vehicles) in air, road runoff, and road dust along a busy Norwegian highway, finding the highest concentrations in road dust and the lowest in air. The study demonstrates that traffic is a major source of microplastic pollution across multiple environmental pathways.