text: Another reason why its good to limit the use of cars is because of the nasty Co2  gas that come out of the of the muffler and polluts the air. Car pollution became so bad that the city of paris put a partial ban on driving to clear the the air of the city. By doing this the air pollution "was down by 60" witch the artical states in paragraph 14. This is a good  thing becase france has a higher pollution rate than other european citys.