text: Second of all, cars cause smog. Smog is extremely harmful to breathe in and is also bad for the environment. For example, in Paris, France, the government enforced a driving ban to alleviate the thick smog. After a few days of less cars on the road, the smog cleared up! (Source 2) This proves that if we didn't have cars in the cities that have smog such as Beijing and Paris, then smog would be much less of a problem and cities would be a much more healthy and safe place to live. Therefore, limiting cars results in less smog.