Tiny plastic particles called nanoplastics may be saturating the North Atlantic Ocean at concentrations far beyond previous estimates, according to new research.
Joseph Winters reports for Grist.
In short:
- Researchers estimate that the North Atlantic holds 27 million metric tons of nanoplastics — plastic particles smaller than 1 micrometer — far exceeding previous pollution estimates.
- The highest concentrations were found just below the ocean surface, where larger plastics degrade into smaller fragments; polyethylene terephthalate, used in water bottles, was the most common polymer.
- Due to their size, nanoplastics can penetrate biological membranes more easily and may pose heightened risks to both marine life and humans, including inflammation and potential links to cancer.
Key quote:
“Our hypothesis is that … nanoplastics could travel more widely in the body even than microplastics, and therefore could have more adverse health consequences.”
— Tracey Woodruff, professor of reproductive health and the environment at the University of California, San Francisco
Why this matters:
Nanoplastics are increasingly unavoidable in our oceans, where they result from the breakdown of everyday plastics. Unlike larger debris that floats in garbage patches or washes ashore, they slip through filters, escape detection, and drift across vast marine ecosystems. Scientists now believe they can cross cellular membranes and travel through the bodies of fish, birds, and humans, raising concerns about their role in reproductive harm, cancer, and immune disruption.
Related: Plastic pollution in the ocean
