text: In Paris, France, they enforced a partial driving ban to cleanse the air of the city. Motorist with an even numbered licenced plate were told to laeve their cars at home or they'd have to pay a $31 fine, also with even numbered plates. After this was done, the congestion went down 60 percent, after 5 days of smog in the air. The reasons why France did this was because they blamed the amount of gasoline coming from the cars. The smog got out of control so they decided to limit car usage.