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Fate and characterisation of microplastics pollution in high altitude rivers of mid-Himalayan region
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Chemical Characterization and Spatial Distribution of Microplastics in the Surface Water of the Arun River Basin, Central Himalaya, Nepal
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Researchers detected microplastics at all 14 sampling sites across the Arun River in Nepal's central Himalayas, finding average concentrations of 30 particles per liter with elevated levels near cropland and construction zones, and identifying polyethylene and PET as the dominant polymer types.
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Researchers found preliminary evidence of microplastics smaller than 250 micrometers in surface water samples from a remote river in Sagarmatha National Park, Nepal, suggesting that plastic pollution has reached even the high-altitude Himalayan wilderness and that more detailed studies are needed to establish baseline contamination levels.
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A systematic survey of rivers and lakes across the Tibetan Plateau found microplastics averaging 4,250 items/m³ in water and 3,750 items/kg in sediments, with small transparent polyamide, PET, and polypropylene fragments dominating near urban outfalls. These findings reveal that even remote, high-altitude ecosystems considered biodiversity refuges are now pervasively contaminated, underscoring the global reach of microplastic pollution.
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