Ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation.
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10 Facts About Ozone layer
2.
The ozone layer contains less than 10 parts per million of ozone, while the average ozone concentration in Earth's atmosphere as a whole is about 0.
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3.
The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 15 to 35 kilometers above Earth, although its thickness varies seasonally and geographically.
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4.
Ozone layer was discovered in 1913 by the French physicists Charles Fabry and Henri Buisson.
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5.
Ozone layer absorbs 97 to 99 percent of the Sun's medium-frequency ultraviolet light, which otherwise would potentially damage exposed life forms near the surface.
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6.
In 1976, atmospheric research revealed that the ozone layer was being depleted by chemicals released by industry, mainly chlorofluorocarbons .
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7.
Ozone layer concentrations are greatest between about 20 and 40 kilometres, where they range from about 2 to 8 parts per million.
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8.
Ozone layer is transparent to most UV-A, so most of this longer-wavelength UV radiation reaches the surface, and it constitutes most of the UV reaching the Earth.
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9.
Ozone layer can be depleted by free radical catalysts, including nitric oxide, nitrous oxide, hydroxyl, atomic chlorine, and atomic bromine .
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10.
Ozone layer levels have dropped by a worldwide average of about 4 percent since the late 1970s.
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