text: Smog is one of the biggest effects to car usage. Smog is actually getting so bad in certain places like Paris that they actually have to ban car use. A lot of places have been recorded to have a lot of pollution like France, only because they perfer diesel fuel. Paris has even let the public transit to be free of charge from Monday to Friday. So if everyone worked on not driving we could slow down pollution a lot, and make a big change.