Fine particulates don't 'bother' you until you have that lung cancer diagnosis.

Lyon.

Its not hard to find out where they are, Michelin is quite proud of them.

Buses on dedicated lanes are OK indeed. However, buses are simply not as comfortable as trams: roads unless in tiptop shape are not as smooth as rail, and bus drivers always take corners too fast.

Having to hold on to something discards it from my preferred list of solutions.

Problem with rubber wheels in metros is absolutely atrocious air quality. I avoid them like the plague.

If anything more than plain X is fancy to you...