Key points from article :
Tube dust are inhalable, highly reactive metal particles from rail and break friction.
Contains iron and other particles such as quartz, chromium, manganese and copper.
Small enough to penetrate and damage the lining cells of lungs and enter blood stream.
In confined tube tunnels tube dust collects leading to a significant exposure in a short time.
Has introduced new techniques to replace tracks, and creates less dust.
The study was published in Respirology journal.
