text: The world has been struggling with pollution for quite some time now and has been trying to come up with ways to cut it down. So why not start with where it derives from the most? Cars. Pollution by cars got so bad in Paris that they had to use license plate numbers to decide what cars could drive on certain days! But what did happen was "Congestion was down 60 percent in the capital of France, after five-days of intensifying smog." (Duffer). That is amazing! Just five days of less car usage and the smog went down 60 precent. Pollution would drop in great precentages if we just cut down car usage a bit. Pollution will always be harmful to the world, but steps should be taken to harm the world as little as possible.