text: Due to smog and pollution to this global city's air, Paris enforced a driving ban to put an end to polution. 4,000 drivers were rightfully so fined that day. This issue had to be taken seriously for a greater cause. For example, for the smog levels to decrease and to purify the air in the cities and suburbs and to prevent pollution. Public transit was free for those five days that the ban was enforced. Congestion dropped 60% in Paris, ever since the driving ban. The smog rivaled Beijing, which is often known for being one of the most polluted cities in the world. Diesel fuel was blamed because of a tax policy  in  favor of diesel fuel in France. More than half of vehicles run on diesel fuel in France.