text: Different cities practice car-free day differently. In Paris, the near-record pollution was at its height. The city participated in car-free day by enforcing a partial driving ban and making people with even numbered license plates leave their cars at home. The following day, the odd numbered liscense plates were confined to home. Any person who didn't follow guidlines and conduct was fined. The congestion of smog in the capital of France decreased by sixty percent. Paris typically has more smog than other European capitals, like Brussels and London. By participating in the car-free day, Paris was able to contribute to cutting down the greenhouse gas emisisions and temporarily fix a few environmental concerns in Paris. Even though they had some effective results, Paris wasn't the only city that participated in the trend.