text: Futhermore, reducing the usage of cars may help reduce pollution. In Paris, France, people have experienced "near-record pollution. Paris enforced a partial driving ban to clear the air".(2) This experience included smog, a very dense layer of water and pollution particles. This air is very dangerous to breathe and live in. "[In this city, sixty-seven] percent of vehicles [use diesel]." (2) Diesel is a heavier than gasoline, and is blamed for a large percentage of pollution. The ban alternates the usage of vehicles; even-numbered plates go one day, odd-numbered the next. This process is sought to cut the usage and emission of pollutants in half. Walking, biking, using public transportation, etc. help reduce pollution because they are services given or provided to everyone. Walking and biking do not emit harmful pollutants. Buses allow people to commute along with other people, but stop anywhere you want. Using these services instead of self-owned vehicles will help reduce pollution.