Which of the following is correct about tropospheric or ground-level ozone? Choose the correct answer from the options given below.

1.It is called good ozone.

2.It is formed due to the downward transfer of ozone from the ozone layer.

3.It is formed due to the action of sunlight on oxides of nitrogen.

4.It is a greenhouse gas.

5.It is a major component of photochemical smog.

A2, 3, 4, 5 only ✓ Correct

B1, 2, 3 only

C3, 4, 5 only

D1, 4, 5 only

Correct answer: (A) 2, 3, 4, 5 only

Explanation

Tropospheric ozone forms near the surface and is a harmful secondary pollutant, unlike the protective stratospheric layer.

Statement 1 is wrong because ground-level ozone is the bad ozone, not the good ozone.

Statement 2 holds since part of it descends from the stratosphere through downward transfer.

Statement 3 holds as sunlight acting on nitrogen oxides drives its photochemical formation.

Statement 4 holds because it traps heat as a greenhouse gas, and Statement 5 holds as it is a chief ingredient of photochemical smog.

It also damages crops and irritates the human respiratory tract.

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