the concentration of fine particles is three times higher in the metro than outside

Taking public transport is good for fighting pollution in the city, but what about our lungs? To find out, the National Health Security Agency (ANSES) studied the air quality in underground railway enclosures, namely the metros of six cities. The result is clear, the fine particle concentration is three times superior than outside.

However, does underground pollution really represent a danger for users? ANSES does not yet pronounce with certainty, for lack of sufficient data. On the other hand, for the association Breathe, who filed a complaint against the Ratp, the effects are more than likely. For ANSES, it is urgent to act on rolling stock, or not. In particular, it would be necessary to change the braking system, and switch it to electric, which would avoid friction between materials and therefore the emission of particles.