NEWS
- Microplastics have been found in the land, sea and air, across the food chain and throughout the human body.
- While the full extent of the health impacts of microplastics are not yet known, studies indicate that they can increase the likelihood of heart attack, stroke, or death.
- With pollution ranked in the World Economic Forum's Global Risk Report 2025 as a top 10 threat, concerted and urgent action is required.
Marine plastic pollution is a global issue, with microplastics (1 µm–5 mm) dominating the measured plastic count. Although microplastics can be found throughout the oceanic water column, most studies collect microplastics from surface waters (less than about 50-cm depth) using net tows. Consequently, our understanding of the microplastics distribution across ocean depths is more limited. Here we synthesize depth-profile data from 1,885 stations collected between 2014 and 2024 to provide insights into the distribution and potential transport mechanisms of subsurface (below about 50-cm depth, which is not usually sampled by traditional practices) microplastics throughout the oceanic water column.