text: One very large problem with the excessive use of cars in one area is air pollution. Lots of cars in the same area commuting can create a thick layer of smoke in the air called smog, and it is not pleasent to experience on the road. That being said, Paris had recently gotten so much smog in the air that it had to put down a partial ban, license plates with even numbers could not drive on Monday, while odd numbered plates could not drive on Tuesday. It sounds crazy, how could such a busy city like Paris realistically put down a travel ban on half of the commuters? Whether you thought it would or not, it worked. Sure there were a couple of motorists who could not take no for an answer and still commuted when they were not suppose to, but a large majority followed the rules of this ban. Apparently the French government underestimated the factor these cars had on the environment, as the ban was recinded early on Tuesday for the pollution almost completely cleared away.