“New research indicates that there may be a whole host of toxic chemicals being shed from tires & brakes that have been largely ignored until now. Even worse, these emissions may be so significant that they exceed those from a typical car's exhaust.”

(Original tweet by @berkie1 on birdsite, so thanks for bringing this up)

https://www.thedrive.com/news/tire-dust-makes-up-the-majority-of-ocean-microplastics-study-finds