What are the differences between UVA, UVB and UVC rays?
UVB rays, which are more intense during the summer, at high altitudes and near the equator, are far more powerful and potentially damaging. They mainly affect the outer layers of the skin. They are the main cause of sunburn, skin aging and skin cancer. UVC rays are blocked by the ozone layer and do not reach the Earths surface. UVA rays are relatively constant throughout the year, and while not as powerful as UVB rays, penetrate more deeply into the skin. UVA radiation contributes to premature skin aging, sunburn and cancer. UVA radiation is prevalent in the light systems used in sun tan salons; these may emit two to five times more UVA than what is found in natural sunlight. How do sunscreens work? Sunscreen ingredients absorb or reflect ultraviolet radiation by forming a barrier on the skin surface. Energy, in the form of sunlight, is converted into heat when it comes in contact with the sunscreen, which is dissipated. In addition to the type of skin, one must also consider other fac
