Paris : "emergency measures necessary" (Hidalgo) Paris on Monday launches alternate driving days for the first time in nearly 20 years to tackle dangerous air pollution levels amid controversy on whether the ban is warranted or will yield results. The restrictions in the French capital and 22 surrounding areas will come into force from 5:30 am (0430 GMT) and could be extended until Tuesday, officials said. Images and soundbites from the deputy mayor of Paris and Socialist candidate to become Paris mayor in upcoming municipal elections.