text: , Robert Duffer goes on about how Paris is covered with smog due to all the car usage(more so diesel fuel than gasoline). After just one day of the ban, the smog cleared up. This proves how beneficial for the environment limiting car usage is. As time goes on and awareness goes up, people realize how bad for the environment cars are, so as a response, participation in events like Day Without Cars is going up. The difference in the these events make is huge, especially in highly polluted areas like Bogota, Columbia    Dear Principal,