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Mizter T · June 12th 15, 08:21 AM posted to uk.transport.london

On 11/06/2015 09:30, d 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?

Large particles that you can see aren't I think a real issue in terms of
respiration. The real issue of pollution in London is the stuff you
cannot see above ground.