The initiative involves a ban on motor vehicles in the centre of the city.
The ban comes ahead of the city`s hosting of the United Nations Climate Conference, which takes place in Paris from 30 November.
Hugh Schofield strolled along the Champs-Elysees to see what local people think of the ban.
Paris `car-free` day draws crowds to Champs-Elysees - VIDEO
29 September 2015
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Crowds of pedestrians and cyclists have converged on the Champs-Elysees in Paris as the city holds a "car-free" day.
