Accumulation and potential for transport of microplastics in stormwater drains into marine environments, Perth region, Western Australia.

Stormwater drains are important sinks for microplastics and potentially aid the transport of microplastics from terrestrial to marine environments. Samples were collected from sediments in five stormwater drainage systems with different land uses, area, population, and sediment characteristics. Microplastic concentrations within the drainage network varied between 0 and 3500 microplastics per kg of dry sediment, with a mean concentration of 664 particles per kg.