Ultraviolet rays can be subdivided into three different wavelength bands: UV-A, UV-B, and UV-C. This is simply a convenient way of classifying the rays based on the amount of energy they contain and their effects on biological matter.
UV-A rays do not have enough energy to break apart the bonds of the ozone, so UV-A radiation passes through the earth's atmosphere almost unfiltered. UV-A penetrates the skin deeper than UV-B, causing wrinkles and skin aging. UV-A may directly cause some skin cancers, including melanomas. Most chemical sunscreens do not protect against UVA, even with high factors like SPF 60 or SPF 100.
UV-B rays have a higher energy level and a shorter wavelength than UV-A. As their energy is often not sufficient to split an ozone molecule, some of them extend down to the earth's surface. Burns skin in less time than UV-A light. Causes basal and squamous cell carcinomas, types of skin cancer.
UV-C is most energetic and most harmful. Luckily, most of UV-C rays do not reach the earth’s surface because of the ozone layer.
Both UV-B and UV-A rays can be detrimental to our health, so it is important that we protect ourselves.
Make sure that sunscreen is a daily part of your life if you are in the sun frequently. There are several all natural sunscreen options out there that are safe and effective for your entire family!