It's worse than regular microplastics. It's 6PPD which is N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, a lethal non-plastic amine.

Moreover, this chemical has been accumulating in the environment, and making its way into food, so we're not just breathing it, but eating it too. Refer to DOI 10.3389/fenvs.2024.1384506