For the PlastTrack project, it is crucial to clearly understand our current standing and the value we can bring to ongoing research around plastic pollution. We know it is a growing issue, and micro- and nanoplastics have not been investigated thoroughly. Around 70% of the marine litter in the Baltic Sea is plastic, where microplastics were found in up to 28% of all sampled fish. Research efforts have aimed to track the fate of plastics, but there is still a need for more knowledge about their sources, degradation rate, and dominant uptake processes.