text: After days of near-record pollution, Paris enforced a partial driving ban to clear the air of the global city. Some drivers were fined and 27 people had their cars impounded due to their reaction of the fine. The cold nights and warm days caused the warmer layer of air to trap car emissions. Diesel fuel was there to blame. Diesel's made up to 67 percent of vehicles in France compaired to a 53.3 percent average.