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Occurrence, Characterization, and Potential Ecological Risks of Microplastics in the Himalayan Riverine Systems
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Scientists found tiny plastic particles (microplastics) in Himalayan rivers that feed into the Ganges and Yamuna, with pollution levels rising as the water flows through more populated downstream areas — meaning even remote mountain water sources aren't safe from plastic contamination. Worse, these plastic bits act like tiny magnets for heavy metals, detergent chemicals, and microbes, potentially carrying harmful substances into the water systems that communities rely on for drinking and irrigation.
Microplastic (MP) pollution is a prevalent environmental concern, omnipresent in soil, water, and air. The Indian Himalayan riverine systems are increasingly threatened by MP contamination, seeking dire attention. This study investigates not only the occurrence, abundance, and characterization of MPs in the rivers of Dehradun, focusing on two tributaries of the Ganges (Rispana and Bindal) and the Yamuna (Tons), but also on their temporal variation during pre- and post-monsoon seasons. A difference in the presence of MP pollutant in the upper Ganges (Rishikesh) versus its lower tributaries-Rispana and Bindal was observed, which was almost nil in the upper regions and detectable in the latter. Water chemistry, including physicochemical analysis and heavy metal analysis, along with Carbon, Nitrogen, and Phosphorus, was estimated and compared at each site. MP abundance ranged from 0.1 to 10.95 particles/L and was consistently higher in the pre-monsoon period. Colored MPs were dominant across sites (65.66%, 86.57%, and 91.72%), with fibers being predominant, followed by fragments and films. FTIR and Raman of MPs revealed primarily polyethylene, polypropylene, polystyrene, and polyvinyl chloride. A glimpse of the presence of heavy metals and microorganisms on the MPs' surface (plastisphere) was depicted via light microscopy and SEM-EDS. Raman spectroscopy revealed MPs were laden with detergent, as hinted by pigmosol detection-a detergent component. Thus, MPs act as carriers for contaminants and microbial colonization, potentially altering the riverine ecosystem dynamics. Overall, the study underscores the ecological risks of MPs in Himalayan riverine systems and calls for targeted mitigation and management strategies.
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This review documents microplastic contamination throughout the Himalayan region, from mountain glaciers and rivers to remote high-altitude locations. Microplastics reach these areas through wind, precipitation, tourism waste, and river transport, and can become trapped in glacial ice before being released during snowmelt. The findings show that even one of the most remote places on Earth is not free from microplastic pollution, with implications for the billions of people who depend on Himalayan rivers for drinking water.
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Scientists found tiny plastic particles called microplastics in rivers throughout the western Himalayan mountains, even in remote areas far from cities. These microscopic plastic pieces are flowing downstream from high mountain areas toward lower regions where millions of people get their drinking water. This matters because microplastics can potentially harm human health when they get into our water supply, and this study shows that even pristine mountain areas aren't safe from plastic pollution.
Microplastics and heavy metal contamination along a land-use gradient in a Himalayan foothill river: Prevalence and controlling factors
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Researchers mapped microplastic and heavy metal contamination in a river flowing through India's Himalayan foothills, finding plastic particles at every sampling site. Concentrations were highest near industrial areas and human settlements, with polyethylene and polystyrene being the most common plastic types. The study shows how human activity drives plastic pollution even in relatively remote freshwater environments.
Microplastics pollution in the Brahmaputra River and the Indus River of the Indian Himalaya
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Researchers sampled shoreline sediments of the Brahmaputra and Indus Rivers in the Indian Himalayas and found microplastics at all sites, with concentrations increasing downstream toward more populated areas, representing some of the first MP data for major Himalayan river systems.
Microplastic in upper Himalayan Ganga river: Occurrence, seasonal dynamics and ecological risk
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Researchers quantified microplastics at 19 sites across the upper Himalayan Ganga River over six months, finding concentrations of 100–1,550 particles per liter in water and rising contamination levels downstream toward densely populated cities, with fibers, polyethylene, and post-monsoon conditions dominating the pollution profile.
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