Overcrowding and excessive advertising are both causes of visual pollution. Another cause could be administrative negligence or when the local management in a metropolitan area fails to control what is built in public places.
Visual pollution occurs when an individual cannot enjoy the view in a particular area due to the negative changes in a natural environment. This can include billboards, trash cans and dumping areas that are exposed, telephone towers that are erected in neighborhoods, electric wires, ugly buildings and even broken-down vehicles. This type of pollution can be controlled through the implementation of laws. For example, the Federal Highway Beautification Act of 1965 limits the number of billboards that can be placed on highways and roads.