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Fate and retention of microplastics in freshwater reservoir: Evidence from atmospheric deposition, size scaling, and hydrological modelling in Rawal Lake, Pakistan
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Scientists studying a drinking water reservoir in Pakistan found that tiny plastic particles are getting in not just from rivers and runoff, but literally falling from the air, settling into the lake constantly like invisible dust. The lake acts like a trap, holding onto larger plastic bits in its sediment while finer particles keep cycling through the water — meaning this contamination builds up over time in a water source communities rely on. Since this reservoir likely supplies drinking water, the findings raise questions about long-term microplastic exposure and highlight the need for better monitoring of urban water supplies worldwide.
Microplastic (MP) are emerging contaminants of concern in freshwater reservoirs, yet their atmospheric inputs, hydrological transfer, and size-dependent fate remain poorly constrained, particularly in South Asia. This study integrates atmospheric deposition measurements, field observations, and hydrological modelling to quantify MP transport and retention in Rawal Lake, Pakistan. MPs were consistently detected in atmospheric fallout, surface water, and sediments, demonstrating active exchange across environmental compartments. Surface water concentrations ranged from 7 to 120 MP L⁻¹, while atmospheric deposition averaged ~18 MP m⁻² d⁻¹, indicating continuous external loading. Spatial patterns revealed elevated concentrations at inflow and shoreline sites, while the spillway exhibited lower levels consistent with export-dominated conditions. Size distributions and polymer composition indicated strong hydrodynamic sorting, with fine particles dominating atmospheric inputs and coarser particles preferentially retained in sediments. Model-based estimates further highlighted atmospheric deposition as a significant loading pathway relative to catchment inputs. Overall, Rawal Lake functions as an integrative sink influenced by both external inputs and internal processes, with implications for contaminant accumulation and freshwater management in urbanized catchments.
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Scientists studying a drinking-water reservoir in India found tiny plastic particles (microplastics) in the water, mud, and fish year-round, with levels shifting depending on rainy vs. dry seasons. These plastics carried harmful chemicals and heavy metals, and since fish from this reservoir are eaten and the water is used for drinking, this raises real concerns about how much plastic and toxic material people may be consuming without realizing it. The findings highlight the need for better water treatment and plastic waste management to protect public health.
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Researchers found tiny plastic particles—fibers, fragments, and granules—literally falling from the air in Lahore, Pakistan, a densely populated city with lots of industry. This means people living there may be breathing in or being exposed to microplastics regularly, though scientists still need to study exactly how this affects our health. The findings highlight the need for cities to find ways to cut down on plastic pollution before it spreads further into the air we all share.
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