Fine particle pollution in the Paris metro reaches values well beyond the standards recommended by the World Health Organization (WHO) This fine particle pollution comes both from the polluted air in the streets, which ventilate the stations, and from the metro trains themselves, which create dust during braking. The study was coordinated by Jean-Baptiste Renard, director of research at the CNRS and member of the scientific committee of the association Respire.
The RATP says it is implementing measures such as air renewal devices and brake linings to reduce the risks.