text: Traffic jams is another downfall of using cars. With so many cars out in the streets it causes the air to have so much smog. Many people have participated in bike riding and walking, but not only is it exercise for your health but it keeps away from people using their cars. With so many people participating this action, not only has it made better air burt also constructed and cropped up new restaurants and shopping districts. They cleared the side walk to make it smoother and cut traffic, as said in source three. This is all in Bogota, Columbia. They said it has made a drastic change in their community with better air and I believe it has made their air better and way reduced smog.