I think that it is not necessary to prohibit the cars and take them away. You can find a million other sources of pollution and the cars is not in first place on air pollution.
For example, why not ban the construction of nuclear-power stations, because in my opinion is the great source of pollution. And as the man himself should know that the garbage he just pollutes everything in terms of itself. You can remove the cars and much more, but if a person does not cease to make sense of the litter that will not happen.
I think it is high time for people to invent cars are not polluting the air, and the people in this area have moved. But still, I believe that if people stop litter then nature will be cleaner, followed by nature and the air is cleaner and better.