Energy from the sun reaches the earth as visible, infrared, and ultraviolet (UV) rays. Exposure to UV rays can cause numerous health problems, such as sun burn, skin cancer, skin aging, and cataracts, and can suppress the immune system. A scale ranging from 0 to 16, used in estimating the risk for sunburn that an unprotected fair-skinned person would have if exposed to the ultraviolet radiation
Page for cell phone, Smartphone ›› ››
