The UV index is the tool that measures the UV radiation level at the surface of the earth. It also illustrates the intensity of the UV radiation. UVI provides information on the importance of protecting themselves from UV radiation.
According to the World Health Organisation, if the UVI is 3 or more than that, then it's highly crucial to protect the skin from the rays of the sun. If the UVI ranges between 1 - 2, then it's considered to be low and thus determined as safe to step outdoors.