A new study finds tiny pieces of plastic pollution permeate the Earth’s atmosphere, falling down to earth in snowfall even in the most remote corners of the globe. Samples taken off the remote Arctic island of Svalbard showed an average of nearly 1,800 microplastic particles per liter of snow, with pollution levels at some European sampling locations more than 10 times higher. Writing in the journal Science Advances, researchers called for more studies on the effects of plastic pollution on human health. They cited a 1998 study that found inhaled microplastics may contribute to the risk of lung cancer.