text: Cars are known to cause pollution and some places have a partial ban on cars. Paris is well known for the Eiffel Tower and also its pollution problem so Paris allowed people with even and odd number license plates to only drive on certain days or else they will be fined. When cars cause pollution it makes smog and smog can kill crops and animals if it gets out of control. Currently heavily populated areas such as Newyork has a big pollution problem causing grey skies.