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Road-scale mapping of tire wear particle pollution in Xizang and their potential atmospheric transport to adjacent glaciers.
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Researchers mapped tiny tire wear particles from roads across Xizang (Tibet), finding emissions reached 4,589 tons per year by 2021, mostly from heavy trucks. Computer simulations showed particles from Lhasa's roads could travel through the air to nearby glaciers, with up to 90% of simulated paths passing over them.
Tire wear particles (TWPs) are among the primary non-exhaust traffic emissions and present a key source of emerging pollution. As the core region of the Tibetan Plateau, Xizang is experiencing rapid expansion of road transportation, while the emission characteristics and environmental impacts of TWPs in this cryospheric region remain poorly understood. This study developed a road-network-based framework integrating field measurements, emission modeling, and atmospheric trajectory simulations to explore TWP pollution across Xizang. The results show that TWP emissions decreased from 2012 to 2016, followed by a rapid increase from 2016 to 2021, reaching 4,589 tons/yr by 2021, with heavy trucks contributing 57.8% of total emissions. Road-scale mapping identifies emission hotspots within the Lhasa-Shigatse-Shannan urban agglomeration. Atmospheric trajectory simulations indicate that Lhasa-sourced TWPs could reach surrounding glaciers, with up to 90% of trajectories passing over these glaciers. This study provides a high-resolution TWP emission map across Xizang accounting for the rapid road network expansion, and offers scientific support for policy development to mitigate TWPs pollution in cryospheric environments.
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Researchers analyzed microplastic contamination in soil along a highway on the Tibetan Plateau and found an average of about 2,248 particles per kilogram, with most particles smaller than 100 micrometers. The microplastics came from multiple traffic-related sources, including tire wear and road markings. The study shows that even remote, high-altitude areas are accumulating microplastics from transportation infrastructure, and the small particle sizes found pose particular environmental and health risks.
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Researchers modeled airborne concentrations of tire wear particles — tiny plastic-containing fragments released when vehicle tires rub against road surfaces — across Stockholm, finding that these microplastic particles are widespread in cities and make up 4–6% of total air particle pollution, with concentrations highest near busy highways and in narrow street canyons.
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Researchers measured tire and road wear microplastics in road dust from eight major Chinese cities. They found the highest concentrations in northern cities like Lanzhou and Xi'an, likely due to drier conditions increasing road friction, with levels ranging from 86 to 175 micrograms per gram. The study also found correlations between these microplastics and markers of cellular damage, suggesting potential health implications from exposure to tire-derived particles in urban road dust.
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