Air Quality: Subway Brakes Soon Less Toxic
This page is translated from the original post "Qualité de l’air : les freins du métro bientôt moins toxiques" in French.

The brake dust from the Paris metro and RER are targeted by a report from Île-de-France Mobilités. Changes are being requested.
Who hasn’t been annoyed by the smell of brake dust on the platform of an RER or a metro? It’s surprising that it took until 2023 for an Île-de-France Mobilités report to address the issue…
Thus, on December 21, 2023, a technical solution was approved to improve air quality in transportation. It involves installing a device that captures fine particles emitted during train and metro braking.
An experiment carried out in 2023 on about ten RER A trains showed a reduction of up to 90% in PM10 particles, 87% in PM2.5, and 62% in PM1.
Therefore, Île-de-France Mobilités is now calling on RATP and Transilien SNCF to deploy this solution as soon as possible. All RER A trains are concerned, as well as lines 1, 2, 4, 5, and 9 of the Paris metro.
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