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The ozone layer protects us against harmful solar ultraviolet radiation. Ozone in the stratosphere absorbs some of the Sunâs biologically harmful ultraviolet radiation. Most of the short-wave radiation (so-called UV-B) is absorbed by the ozone layer, whereas long-wave UV (so-called UV-A) passes through the ozone layer and reaches the ground.
And new, improved forms of protection against UVA keep emerging. Keeping up with these new developments is a worthwhile challenge that can help all of us prevent sun damage. What is Ultraviolet Radiation? UV radiation is part of the electromagnetic (light) spectrum that reaches the earth from the sun. It has wavelengths shorter than visible light, making it invisible to the naked eye. These wavelengths are classified as UVA, UVB, or UVC, with UVA the longest of the three at 320-400 nanometers (nm, or billionths of a meter).