If you travel by tube, a lot of that is sloughed off dead skin. | Hacker News

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		Angostura on June 21, 2019 \| parent \| context \| favorite \| on: London bans cars for a day in the fight against ai... If you travel by tube, a lot of that is sloughed off dead skin.

ubercow13 on June 21, 2019 [–]

Most of the tube dust is oxidised iron particles from the trains

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