In the Western world, protecting the skin against ultraviolet (UV) light damage has been a mainstream concern for more than a decade. UV radiation is part of the electromagnetic radiation spectrum emanating from the sun and can be divided into short wave UVC (200-280 nm), medium wave UVB (280-320 nm) and long wave UVA (320-400 nm). As solar radiation enters the atmosphere, its effects are modified by the ozone layer and air pollution, geographic latitude, elevation, season, time of the day, cloudiness, etc.
