Sargassum seaweed is bringing more than just a putrid smell to South Florida beaches. 

In a new study, Stetson University student Charlotte Kraft and environmental science professor Wendy Anderson have discovered that a strikingly high proportion of the stinky brown seaweed piles arriving on shore consists of seaborne plastic pollutants.

“We have a lot of single-use plastics and microplastics that are out in the ocean,” Kraft tells New Times. “They get broken down into smaller pieces, such as plastic nurdles, balloons, ribbons, microfibers, and fishing line ropes. I have a whole slew of different things I found in there.”

Read more on Miami New Times.