text: One major problem in the use of diesel fuel has been the pollutants in the air which lead to an extreme amount of smog. Recently, Paris has had more smog than any other European capital. They knew that something had to be done to stop this, so they started a new "car-free" law. This resulted in a fine of $31 for the citizens who used their cars. Soon after that law had become intact, almost 4,000 drivers were fined, and just about 27 people had their cars impounded that day for their reaction to the fine.