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Scientists have detected nanoplastics in Antarctic soil for the first time. This provides fresh evidence that tiny plastic particles can travel through the atmosphere and reach some of the most remote places on Earth. But how is it even possible?The study was published in Scientific Reports and found nanoplastics in soils from the McMurdo Dry Valleys, one of the coldest and driest regions on the planet. Researchers say the findings suggest that plastic pollution is no longer confined to populated or industrialised areas and may now be present even in the Antarctic interior.Among the particles identified were fragments from tyre wear, along with five other common plastics used in everyday products. The discovery also points to a combination of local human activity and long-range atmospheric transport as likely sources of the contamination.
A new concern beyond microplastics
Microplastics have become a growing environmental concern in recent years, but scientists say nanoplastics could present an even greater challenge.Nanoplastics are plastic particles measuring less than one micrometre across. Because they are much smaller than microplastics, they can remain suspended in the air more easily, pass through cell membranes and carry other pollutants on their surfaces.Scientists have already detected nanoplastics in many parts of the world, including remote locations such as Greenland and the Alps. Those discoveries hinted that these tiny particles could travel long distances through the atmosphere.Until now, Antarctic soils, particularly those far from the coastline, had remained one of the few places where nanoplastics had not been reported.Antarctica has long been regarded as one of the world’s most pristine environments because it has no permanent population, no history of industrialisation and only a limited human presence through scientific research stations. The continent’s extreme weather conditions make it difficult for ecosystems to prosper. Although previous studies had already documented macroplastics and microplastics in Antarctic seawater, sediments, glaciers, sea ice, snow and coastlines, little was known about plastic contamination in inland soils and land surface.The new study fills part of that gap.
Plastic pollution in Antarctica is way more common than you think
New detection method uncovers hidden pollution
Finding nanoplastics in soil is one of the most difficult things.Unlike larger plastic fragments, nanoplastics occur at extremely low concentrations and are difficult to separate from soil particles. Earlier methods struggled because plastic particles clumped together, mixed with soil materials and were not sensitive enough to detect very small amounts.The researchers said advances in detection technology have now made these measurements possible.They write, “This gap stems from analytical challenges, including matrix interference, particle aggregation, and limited sensitivity of existing detection methods—especially crucial in remote environments like Antarctica, where NP concentrations are extremely low. Recently, thermal desorption-proton transfer reaction-mass spectrometry (TD-PTR-MS) has emerged as a highly sensitive technique capable of detecting NPs at ng levels, offering a promising path forward in this field.“Using this technique, the team was able to detect nanoplastics at concentrations measured in nanograms. For context, 1 nanogram (ng) = 0.000000000001 kilograms (kg)
Sampling one of the world’s harshest environments
Researchers collected soil samples from the Taylor and Wright valleys (two of Antarctica’s largest ice-free Dry Valleys) in the McMurdo Dry Valleys during January 2023.The team analysed 13 topsoil samples along with four samples taken from depths greater than 20 centimetres. Each sample was analysed using a newly developed testing method capable of detecting extremely small amounts of nanoplastics. The scientists also tested the soils for microplastics.Nanoplastics were detected above the method’s detection limit in 54 per cent of the topsoil samples.The highest concentration measured reached 295 nanograms per gram of soil.The particles were also found in half of the deeper soil samples, but at lower concentrations. This suggests some nanoplastics may gradually move deeper into the soil over time or become buried beneath the surface.
Antarctica has one of the harshest environments in the entire world
Six common plastics identified
The analysis revealed six commonly used plastic types.Polypropylene accounted for the largest share, making up 41.9 per cent of the total plastic mass detected.Tyre-wear particles were the second most common at 29.6 per cent, followed by polyethylene at 14.6 per cent.Researchers also identified polyethylene terephthalate, commonly known as PET, polystyrene and polyvinyl chloride.The team cautioned that the true level of contamination is likely higher than the study reports.Their extraction method cannot recover every particle present in the soil, meaning some nanoplastics would go undetected. The technique is also more effective at identifying smaller particles than larger ones, which could introduce another source of underestimation.Researchers also noted that their sample size was relatively small and that plastic concentrations varied considerably between locations, making it difficult to draw conclusions for the entire McMurdo Dry Valleys region.
Where did the plastics come from?
After confirming the presence of nanoplastics, the researchers investigated how they might have reached such isolated areas.They used atmospheric backward modelling to estimate where air masses arriving at the sampling sites had originated and how plastic particles may have been transported throughout different seasons.The modelling suggests there is no single source.Local human activity appears to contribute during the Antarctic summer, while long-range atmospheric transport becomes important during winter.Researchers also identified melting sea ice as another possible contributor, releasing plastic particles that had previously been trapped within the ice.
Research stations leave a local footprint
Several scientific facilities operate within roughly 100 to 120 kilometres of the sampling sites.These include Ross Island, Scott Base, McMurdo Station and the Marble Point Weather Station, along with two smaller United States research outposts in Taylor Valley that support summer fieldwork.The researchers explain, “Research stations such as Ross Island, Scott Base, McMurdo Station, and the Marble Point Weather Station—together with two small US outposts in the Taylor Valley that support researchers during the summer—are located within approximately 100–120 km of our sampling sites. McMurdo Station accommodates up to 1,200 people during summer and around 150 in winter, while Scott Base hosts 86 people in summer and 11 in winter. This may also explain why, during the Antarctic summer, plastics are more locally sourced within the continent.”The findings suggest that even relatively small seasonal populations can leave a measurable environmental footprint.
Plastic particles may circle the globe
The study provides evidence that nanoplastics can travel enormous distances through the atmosphere.According to the researchers, particles measuring between 100 and 1,000 nanometres can remain airborne long enough to cross continents and oceans. Earlier research has already shown that microplastics can stay suspended in the atmosphere before eventually settling thousands of kilometres from where they were released.The team’s atmospheric modelling suggests that long-range transport becomes a source of both nano- and microplastics in the McMurdo Dry Valleys during the Antarctic winter.That means some of the plastic detected in Antarctica may have originated far beyond the continent itself.
Building a baseline for future monitoring
The researchers say the study provides the first baseline data on nanoplastic contamination in Antarctic soils and could support future environmental monitoring programmes.They also argue that identifying how plastics reach Antarctica could help improve waste management practices and guide operational policies at research stations across the continent.The study marks the first confirmed evidence of nanoplastics in Antarctic soil. It also suggests that airborne plastic pollution is capable of reaching places once considered among the least affected by human activity.
