Microplastics (MPs) pollution in the water environment is recognized as an important environmental risk. Among the diverse sources of MPs pollution, road dust is a major contributor via stormwater runoff. Roaddust mainly originates from degradation of vehicle tyres, road marking paints, polymer-modified bitumen and the broken plastics on the surface of the road. The objective of this study is to provide a comprehensive understanding of the fate and control of MPs in the open water environment. This review critically discusses the characteristics and pathways of road dust-associated MPs in stormwater and common stormwater treatment processes used for removing MPs, and provides insight into the technical challenges of these technologies. Constructed wetland is widely used for stormwater management; however, it is found that this process is only removing 28 % MPs as they usually remain suspended or settle down very slowly in the sedimentation basin of constructed wetlands. This is because of the low density of MP particles as well as the low retention time of the wetland. Thus, untreated stormwater, rich in MPs, is released into open waterbodies. This study concludes by providing an outlook of the future opportunities of installing membrane- or flotation-based technologies in the outlet of the constructed wetland for removing 90–95 % MPs and other remaining contaminants. Such a process can produce clean water either for use in households, for sanitation, and for industrial and agricultural usage, or alternatively, for safe discharge into open waterways.

水环境中的微塑料（MPs）污染被认为是一种重要的环境风险。在 MP 污染的多种来源中，道路灰尘是雨水径流的主要贡献者。路尘主要来自车辆轮胎的降解、道路标线漆、聚合物改性沥青和路面破碎的塑料。本研究的目的是全面了解 MPs 在开放水域环境中的命运和控制。这篇综述批判性地讨论了雨水中与道路灰尘相关的 MP 的特征和途径，以及用于去除 MP 的常见雨水处理过程，并提供了对这些技术的技术挑战的见解。人工湿地广泛用于雨水管理；然而，发现该过程仅去除了 28% 的 MP，因为它们通常在人工湿地的沉积池中保持悬浮或沉降非常缓慢。这是因为 MP 颗粒的密度低以及湿地的停留时间短。因此，富含 MPs 的未经处理的雨水被释放到开放的水体中。本研究最后展望了在人工湿地出口安装基于膜或浮选技术的未来机会，以去除 90-95% 的 MP 和其他残留污染物。这样的过程可以生产清洁水，用于家庭、卫生、工业和农业用途，或者安全排放到开阔的水道。