Intense maritime commerce together with highly industrialized activities in the coastal zone enhance the economic importance of the North Sea. However, the external stress caused by human actions affects the ecosystem functioning. Plastics, in particular, are an increasing source of pollution in the marine environment, influencing the quality of the North Sea water. As water quality is crucial for biological productivity and abundance of species, many questions arise: How can the micro plastics effect be quantified? Which areas are the most impacted?