Have you ever touched the air vents behind the seats on the Central line? I made that mistake at the weekend and I won’t be repeating it.
As I spread my arms along the grille, desperately trying to cool down inside the nauseating hot carriages, a chequered pattern of black soot appeared all over my palms. Scrubbing away at it with a dollop of hand sanitiser, the thought occurred: if that’s coming out of the vents, what’s going into my lungs?
