Publication date: Jan 31, 2025

This study addresses the critical knowledge gap on riverine macroplastic inputs to marine litter, focusing on changes in waste composition in a post-pandemic context. While marine plastic pollution has been widely documented, data on floating macrolitter from urban rivers remain limited. The first comprehensive, year-round assessment of floating macrolitter at both branches of the Tiber River mouth were conducted, using the harmonized RIMMEL approach using a dedicated android App. The simultaneous monitoring conducted at two sites (TIB2 and TIB3), recorded abundance, material composition, size and common item types, revealing an estimated annual transport rate of 9 cD7 10 items/year from the Tiber River to the Mediterranean Sea. Specifically, the transport rate was 104 +/- 87 items/h and density of 1170 +/- 151 items/km. The litter transport rate exhibited seasonal variability, with the highest peak observed in autumn and the lowest in summer. Findings reveal a post-pandemic reduction of

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Original Article