text: On top of being a healthier population, cutting out cars would decrease the amount of air pollution. Transportation is one of the largest sources of carbon emission into the environment. In 2014, Paris had to create certain bans on driving in an effort to clear their air of smog. Paris usually has more smog than other capitals in Europe, and has even rivaled the amount of smog in Beijing, China, which is one of the most polluted cities in the world. Bogota, Columbia has made their own efforts to  lower the amounts of pollution. The people of Bogota created a program in which people hiked, biked, skated, or took buses to get where they needed to go during a car-free day. "It's a good opportunity to take away stress and lower air pollution," said a businessman by the name of Carlos Arturo Plaza.