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Microplastics in Aquatic Ecosystems: Sources, Environmental Fate, and Policy Perspectives
Summary
This review paper pulls together existing research on how tiny plastic particles (microplastics) get into our rivers, lakes, and oceans, finding that they're widespread but measured so inconsistently across studies that scientists struggle to compare results or fully assess the risks. Since these water systems are connected to our drinking water and food supply, the researchers argue we urgently need standardized testing methods and stronger cooperation between scientists and regulators to understand the real health risks and clean up this pollution effectively. The takeaway: microplastics are everywhere in our water, but better science-to-policy teamwork is needed before we can fully protect our
Microplastics (MPs; <5 mm) represent a growing environmental concern that increasingly challenges environmental monitoring, governance, and evidence-based decision-making. This review critically examines how current scientific understanding of microplastic sources, classification, occurrence, and environmental behavior can support environmental governance. MPs are classified as primary and secondary particles; however, persistent inconsistencies in size definitions, shape descriptors, and polymer identification limit the comparability of monitoring data and constrain the development of coherent regulatory frameworks. Evidence on the occurrence of MPs in surface waters and sediments highlights widespread contamination and pronounced spatial variability, raising challenges for risk assessment and policy harmonization across regions. Key transport pathways, including atmospheric deposition, terrestrial runoff, and riverine fluxes, are analyzed to illustrate how local emissions translate into large-scale environmental impacts. Rivers emerge as key components linking sources to receptors, offering relevant points for policy intervention and management measures. The review evaluates current policy responses to microplastic pollution, identifying significant gaps in standardized monitoring, data integration, and risk assessment approaches. It emphasizes the need for stronger alignment between scientific outputs and policy requirements, including the co-production of knowledge involving scientists, regulators, and stakeholders. By outlining pathways through which scientific evidence can inform regulatory design and environmental management, this study provides actionable insights for improving policy effectiveness. Advancing harmonized methodologies and integrating science into decision-making processes are essential steps toward mitigating microplastic pollution and supporting sustainable environmental governance.