Visual pollution refers to unwanted sights that impair one's ability to enjoy a vista. It disturbs people visually and psychologically by creating unnatural changes to the environment. Sources of visual pollution include billboards, electric wires, garbage, dumping areas, broken vehicles, abandoned buildings, vandalism, squatter areas, traffic, sidewalk vendors, holes in streets, and pornographic images. Effects include distraction, eye fatigue, loss of identity, and short-temperedness. Prevention methods involve limiting posters and signs, reducing graffiti, and protecting urban elements from banners.