Instead of helping to tackle the world’s staggering plastic waste problem, recycling may be exacerbating a concerning environmental problem: microplastic pollution. A recent peer-reviewed study that focused on a recycling facility in the United Kingdom suggests that anywhere between 6 to 13 percent of the plastic processed could end up being released into water or the air as microplastics — ubiquitous tiny particles smaller than five millimeters that have been found everywhere from Antarctic snow to inside human bodies.

Research out of Scotland suggests that the chopping, shredding and washing of plastic in recycling facilities may turn as much as six to 13 percent of incoming waste into microplastics—tiny, toxic particles that are an emerging and ubiquitous environmental health concern for the planet and people.