text: To begin, cars are the second most cause of air pollution in the United States behind power plants. Since the end of World War II the U.S.A has been idolizing cars, and they have been focusing on the production of these cars. In Vauban, Germany there is a ratio of 3 to 10 people who own cars. Only 30% of the population owns a car, which is saving the air from quite a bit of pollution. Another event that will help lower pollution would be banning driving cars for a day or two. In Paris, there was so much smog that it was compared and even rivaled Beijing, China; which is one of the most polluted cities in the world. The people who drove their cars on this day would be fined $31 American dollars. The public transit was free of charge because it was being promoted to use, as it helps the air become less polluted. This event also happened in three Colombian cities, Bogota, Cali, and Valledupar. The ban on the cars made many people seem to be happier, and more energetic. This ban has been happening for three years now in Bogota, and other Latin American cities are now seeing the importance of it. The use of bicycles, the public transit, or even walking helps reduce air pollution in your city.