Although it represents only a tiny fraction of the atmosphere, ozone is crucial for life on Earth. ... Most ozone resides in the stratosphere (a layer of the atmosphere between 10 and 40 km above us), where it acts as a shield to protect Earth's surface from the sun's harmful ultraviolet radiation.
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Although it represents only a tiny fraction of the atmosphere, ozone is crucial for life on Earth. ... Most ozone resides in the stratosphere (a layer of the atmosphere between 10 and 40 km above us), where it acts as a shield to protect Earth's surface from the sun's harmful ultraviolet radiation.