This has been known for years - just look at the London Underground for knowledge of the impact of this. The brake dust is all that black soot around the walls. The Unions have been raising it against deaf ears for years.

https://www.bbc.co.uk/news/uk-england-london-51712200
https://oem.bmj.com/content/62/6/355 2019
https://cleanair.london/hot-topics/tube-dust-is-not-safe/ 2012
https://news.trust.org/item/20190110180619-ja6ve 2015

Everyone loves a Morgan. Even me, unless it's broken again.