I did not note that because last I heard the EU was working on legislation to quantify tires and brake dust and I hadn’t heard anything about it since. I’m not sure if they decided that it was indeed something they’ve decided to regulate or not. I’ve since moved away from monitoring EU regulations and have been more focused on EPA/CARB.

At the very least I don’t know of any such quantifiable study and I’m hesitant to speak about things I don’t feel qualified to speak about.

FWIW, I’m not sure if tire wear counts as particulate emissions. Most of what I know of being measured is diluted exhaust, soot, particulate count in exhaust, and particulate mass in exhaust.

Quantifying tire wear microplastics seems rather hard to do in a laboratory setting. Your almost have to some sort of casing around the chassis dynamometer. Would that interfere with actually using the dynamometer? I don’t know. Maybe if you had a MFC to vacuum up the particulates. Alternatively, you can try to quantify tire wear separate from chassis testing but that would be outside the realm of what I am capable to speak about