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How does the ozone layer filter out the ultraviolet rays?

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The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects. read more

The ozone layer is very effective at screening out UV-B; for radiation with a wavelength of 290 nm, the intensity at Earth's surface is 350 million times weaker than at the top of the atmosphere. Nevertheless, some UV-B reaches the surface. read more

The ozone is composed of both O2 and O3. Shortwave UV light (100-240nm) has enough energy to knock an electron out of an O2 bond creating an excited molecule O2 excited which decomposes to two free atoms of oxygen. read more

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