Microplastics are turning up in unusual places increasingly often as they filter into nearly every facet of life on Earth. They’ve been discovered in drinking water, food, air and even in blood. Now, scientists have found that these tiny particles might even be able to influence the weather.

Researchers reported Wednesday they detected microplastics in a majority of cloud samples taken from a mountaintop in China, in a study published in the American Chemical Society’s Environmental Science & Technology Letters.