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Why is a distinction made between atmospheric ozone and ground-level ozone?

Answer and explanation

Correct answer: Upper-atmosphere ozone is protective, whereas ground-level ozone can be a pollutant

Direct answer: B is correct. Ozone is the same three-oxygen molecule, O₃, but its effect depends strongly on where it is found. Ozone high in the stratosphere forms the ozone layer and absorbs much harmful ultraviolet radiation from the Sun, protecting living organisms. Ozone near the ground is formed in polluted air through sunlight-driven reactions involving nitrogen oxides and other pollutants. It can irritate the respiratory system and harm plants, so it is called a pollutant at that level. A is wrong because both locations have effects. C reverses the protective role of stratospheric ozone. D is wrong because upper-atmosphere ozone is not confined to oceans. The key warning is: “Good high, harmful nearby,” though this is a simplified memory aid.

Related tags

Ozone LayerGround-Level OzoneAir PollutionUltraviolet RadiationGeographyClass 11Bad Debts And ProvisionsFinancial Statements – Ii

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