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What is bad ozone and good ozone

The ozone gas that somehow reaches ground level becomes an air pollutant as it damages crops and is harmful to breathe is known as bad ozone whereas when it is present in the stratosphere, it is good ozone as it protects us from UV rays.
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Here, ground-level or "bad" ozone is an air pollutant that is harmful to breathe and it damages crops, trees and other vegetation. ... The stratosphere or "good" ozone layer extends upward from about 6 to 30 miles and protects life on Earth from the sun's harmful ultraviolet (UV) rays.
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Here, ground-level or "bad" ozone is an air pollutant that is harmful to breathe and it damages crops, trees and other vegetation. ... The stratosphere or "good" ozone layer extends upward from about 6 to 30 miles and protects life on Earth from the sun's harmful ultraviolet (UV) rays.
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