What is smog? Why is it dangerous?
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Smog is a harmful mixture of fog, dust and air pollutants such as nitrogen oxides, volatile organic compounds, etc. which combine with sunlight to form a dense layer of ground-level ozone.
If you are wondering why ozone is bad, since its layer protects earth from harmful UV rays, here's the catch: ozone present high in the atmosphere is good, but when nearer to the ground, it can cause irritating health effects.
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