Final answer:
Ozone is harmful in the troposphere due to its role in creating smog, while it is beneficial in the stratosphere by absorbing harmful ultraviolet radiation.
Explanation:
Ozone is considered a bad thing in the troposphere because it is harmful to breathe and is a primary component of smog. Conversely, in the stratosphere, ozone is beneficial as it absorbs most ultraviolet radiation, protecting life on Earth from harmful UV rays.
Learn more about Ozone and its effects in the atmosphere here:
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