
Last week, the smog in Paris got so bad, city officials made public transit free and banned half the city’s cars from the road. The vehicle ban only lasted a day , with the reduced traffic and changing weather patterns alleviating the smog situation. But why did the smog get so bad in the first place? Blame France’s long love affair with diesel-powered vehicles—an affair the country will probably have to end, or at least modify, to prevent further smog emergencies.
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