Tiny plastic particles have made their way into some of the most remote places on Earth—including the snow of Antarctica. In this study, snow were collected from a path stretching from the coast of Antarctica to the South Pole (715 miles). We looked for two types of small plastic particles: slightly larger ones (microplastics) and much smaller ones (nanoplastics). Using advanced microscopes, we counted how many particles were in each sample and estimated how much plastic they added up to. We found that the amount of nanoplastics in some places was hundreds of thousands of times higher than microplastics—especially one type called polyethylene, which is common in packaging. This suggests that larger plastic pieces may be breaking down into many smaller ones over time. Although overall plastic levels in Antarctic snow are lower than in cities or oceans, their presence so far from human activity is troubling. Our findings show that plastic pollution can travel long distances and that very small particles may be far more common than we realized. This research helps us understand how plastic breaks apart and spreads—even to the coldest, most untouched parts of the planet.