On Thursday, 11 June 2015 09:30:29 UTC+1, wrote:
I was waiting for a northern line train at old street this morning and when
the train came in I noticed its headlights were picking out a lot of dust in
the air. Probably most of it is brake dust but even so, it can't be very
healthy can it?

--
Spud

This has been a problem for years and years. Ever tried to look at the end of Camden Station from the other end - its murky and hazy. Apparently 80% of the dust is dead skin - probably a mixture of mouse droppings and asbestos too. Whatever DON'T bounce up and down on the filthy Bakerloo Line seats. Then you will see the dust fly. CJB.