WHAT IS A OZONE?

WHAT IS A OZONE?
-OZONE IS A TOP LAYER OF OUR EARTH.IT PREVENTS THE UV RAYS ON EARTH.
MY DOUBT IS THAT OZONE IS SAID THAT ITS A SECONDARY POLLUTANT AND REACTS WITH UNBURNT HYDROCARBON TO FORM PHOTOCHEMICAL SMOG.PLEASE CLEAR MY DOUBT
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