Nanoplastic Pollution Found At Both of Earth’s Poles For First Time

Nanoplastic pollution has been detected in polar regions for the first time, indicating that the tiny particles are now pervasive around the world.

The nanoparticles are smaller and more toxic than microplastics, which have already been found across the globe, but the impact of both on people’s health is unknown.

Analysis of a core from Greenland’s ice cap showed that nanoplastic contamination has been polluting the remote region for at least 50 years. The researchers were also surprised to find that a quarter of the particles were from vehicle tyres.

Nanoparticles are very light and are thought to be blown to Greenland on winds from cities in North America and Asia. The nanoplastics found in sea ice in McMurdo Sound in Antarctica are likely to have been transported by ocean currents to the remote continent.

Plastics are part of the cocktail of chemical pollution that pervades the planet, which has passed the safe limit for humanity, scientists reported . Plastic pollution has been found from the summit of Mount Everest to the depths of the oceans. People are known to inadvertently eat and breathe microplastics and another recent study found that the particles cause damage to human cells.

Dušan Materić, at Utrecht University in the Netherlands and who led the new research, said: “We detected nanoplastics in the far corners of Earth, both south and north polar regions. Nanoplastics are very toxicologically active compared to, for instance, microplastics, and that’s why this is very important.”

The Greenland ice core was 14 metres deep, representing layers of snowfall dating back to 1965. “The surprise for me was not that we detected nanoplastics there, but that we detected it all the way down the core,” said Materić. “So although nanoplastics are considered as a novel pollutant, it has actually been there for decades.”

Microplastics had been found in Arctic ice before, but Materić’s team had to develop new detection methods to analyse the much smaller nanoparticles. Previous work had also suggested that dust worn from tyres was likely to be a major source of ocean microplastics and the new research provides real-world evidence.

The new study, published in the journal Environmental Research, found 13 nanograms of nanoplastics per millilitre of melted ice in Greenland but four times more in the Antarctic ice. This is probably because the process of forming sea ice concentrates the particles.

In Greenland, half the nanoplastics were polyethylene (PE), used in single-use plastic bags and packaging. A quarter were tyre particles and a fifth were polyethylene terephthalate (PET), which is used in drinks bottles and clothing.