A) ionosphere
B) stratosphere
C) troposphere
D) lithosphere
Correct Answer: B
Solution :
The ozone \[({{O}_{3}})\] an isotope of oxygen, exists in so called ozone layer at a height of about 15-60 km in the middle and upper stratosphere and lower mesosphere. The depletion of stratospheric ozone in troposphere is a problem. Thus, tropospheric ozone is regarded as a pollutant.
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