Editorial on the Research TopicPlastic pollution in a changing marine environment: effects and risk Plastic litter is persistent in marine environments, which leads to accumulation and potential effects in biota. The estimate of risk of plastic particles in the marine environment, based on a quantitative analysis of the probability of exposure of biota and magnitude of effects, needs high quality data on exposure (OSPAR, 2010; GESAMP, 2019) and effects (Redondo-Hasselerharm et al., 2023). Currently there are important data gaps concerning litter densities in some geographical areas, which are essential to inform authorities on plastic litter hotspots and on the efficiency of mitigation measures. Besides accumulation zones of macrolitter, it is essential to have an improved understanding of microplastic (<5mm) formation mechanisms for estimating plastic particle sizes in the environment, and establish their potential for ingestion by marine organisms (Kooi and Koelmans, 2019). The ubiquity of microplastics in marine ecosystems requires further contextualization within a multi-stressor framework, as combined stressors can lead to synergistic effects (Catarino et al., 2022;Khan et al., 2022), and a broader vision of the plastic pollution impacts' magnitude is crucial for understanding and quantifying risks and effects in marine ecosystems. The goal of this research topic was to provide an overview of high-quality data collection (useful for risk assessment) and procedures, to report plastic litter and particles accumulation in the environment and biota, to investigate microplastic formation due to UV exposure, as well as to discuss potential interactions of plastic particles and climate change in future scenarios.Data infrastructures are vital for aggregating standardized information and providing insights on litter accumulation zones in the marine environment. For example, Vanavermaete et al. (2023) used data available in the ICES DATRAS (International Council for the Exploration of the Sea, Database of Trawl Surveys) on collected field surveys on seafloor macrolitter, both at regional and local scales. The authors focused on the OSPAR Greater North Sea and Celtic Seas, as well as the Belgian Part of the North Sea. The analysis highlighted that litter consisted primarily of plastic. At the local level, half of the collected litter could be linked to fishing activities. A significant correlation between Frontiers in Marine Science frontiersin.org 01