Metro pollution: Paris's dirty secret • FRANCE 24 English

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The Paris metro is one of the oldest underground railway networks in the world. Every day, 4 million people in the French capital rely on its services. But could Parisians be unknowingly exposing themselves to toxic levels of air pollution? The Down to Earth team takes a closer look.

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They need to reduce the number of cars in city and renovate every station as well as upgrade the train.

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