Consider the following statements regarding Tropospheric and Stratospheric ozone 1 Stratospheric ozo...........

Geography and Environment (MPPCS) World climates

Consider the following statements regarding Tropospheric and Stratospheric ozone:

1. Stratospheric ozone is naturally formed in chemical reactions involving ultraviolet sunlight and oxygen molecules.

2. Tropospheric ozone is naturally formed in chemical reactions involving hydrocarbon and nitrogen oxide without involving sunlight.

3. Unlike stratospheric ozone, the tropospheric ozone cannot be destroyed.

Which of the above statements is/are correct?

1 only

2 and 3 only

1 and 3 only

1, 2 and 3

Tropospheric and Stratospheric Ozone :

Stratospheric ozone is naturally formed in chemical reactions involving ultraviolet sunlight and oxygen molecules, which make up 21% of the atmosphere. In the first step, sunlight breaks apart one oxygen molecule (O 2 ) to produce two oxygen atoms (2 O). In the second step, each atom combines with an oxygen molecule to produce an ozone molecule (O 3 ).
Stratospheric ozone formation and Depletion:
These reactions occur continually wherever ultraviolet sunlight is present in the stratosphere. As a result, the greatest ozone production occurs in the tropical stratosphere.
The production of stratospheric ozone is balanced by its destruction in chemical reactions. Ozone reacts continually with a wide variety of natural and human-produced chemicals in the stratosphere. In each reaction, an ozone molecule is lost and other chemical compounds are produced. Important reactive gases that destroy ozone are those containing chlorine and bromine.