Which of the following statements is incorrect?

Question

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Answer 1

Photochemical smog is a noxious smog produced by the photochemical oxidation of nitrogen oxides with hydrocarbons in the presence of ultraviolet light from the sun. One of the products of the reaction is ozone, thus, the photochemical smog always contains ozone (O3).
Forests are called green lungs because it consists of trees which have green leaves. The leaves take in carbon dioxide and give out oxygen. thus they purify the air.
Lead may be present in exhaust fumes emitted into the atmosphere by automobiles which pollute the environment.

Answer 2

Photochemical smog is a noxious smog produced by the photochemical oxidation of nitrogen oxides with hydrocarbons in the presence of ultraviolet light from the sun. One of the products of the reaction is ozone, thus, the photochemical smog always contains ozone (O3).
Forests are called green lungs because it consists of trees which have green leaves. The leaves take in carbon dioxide and give out oxygen. thus they purify the air.
Lead may be present in exhaust fumes emitted into the atmosphere by automobiles which pollute the environment.