text: Another advantage of limiting car usage would be do reduce smog polution. Now this is not only a problem in America, it's all over the world. Paris is particularly bad in this division. Paris typically has more smog that other European capitals. It got so horrible they has to enforce a "driving ban" to ensure all the air was clear in the global city. It even rivaled Beijing, China which is known as one of the most polluted cities in the world. After about five days the congestion on the streets plumitted down to 60%.