> Surely brake dust must be negligible compared to tire and asphalt dust? Brake dust is kinda different problem. Yeah it puts particles in the air, but most of

> Surely brake dust must be negligible compared to tire and asphalt dust? Brake dust is kinda different problem. Yeah it puts particles in the air, but most of it is pretty biodegradable (carbon and iron), and rest of it could probably be made that - technically loss of efficiency here could be compensated for, which is far harder for tyres.