text: Other cities like Paris have made laws to control the amount of pollution cars produce since , this capital have more smog than other European capitals making this a awful fact. With the actions they have made of baning even-numbered license plate on Mondays they have reduced the amount of smog which is good. Another example is what is happening in Bogota, Colombia where you can see car-free days, where people any other mean of transportations except for personal cars. When the actions of both cities atre taken it is visible the cahnge on the enviroment. This great ideas help the crouded cities to reduce their levels of pollition and icentive people on use the car less.