I think the issue might be visibility.
Naively, it feels like most of the issue is from a small number of extra sooty vehicles. But that belief is probably just because of how visible it is. The brake/Tyree dust isn’t visible because it is more spread out.
I don’t understand why this article isn’t BS. It was meant to prevent passive snooping. If I connect to a network, it needs to know who I am.
I’ve worked with companies that implement this type of tech for monitoring road traffic congestion. IOS reduced the number of ‘saw same phone twice and can calculate speed’