EUROqCHARM is an EU-funded H2020 project that lasted from 01 November 2020 – 31 October 2023. The project provided harmonised methodologies for the monitoring and assessment of marine plastics (macro-, micro- and nano-) in all environmental compartments: water, soil/sediment, air, and biota. Additionally, it released blueprints for standards of marine litter monitoring and data management and recommendations for policy and legislation.