Which one of the following statements is correct ? Ozone is found in the Earth’s atmosphere mostly between ,

Ozone (O3) is a trace gas primarily located in the stratosphere, the atmospheric layer extending from approximately 10-15 km up to 50 km [t1, t6]. While ozone is present throughout the atmosphere, about 90% of it resides in the stratosphere [t3, t4]. Scientific sources and textbooks specify that the highest concentration of ozone, often referred to as the 'ozone layer' or 'ozonosphere', is found between 20 km and 50 km [c3, c5]. Specifically, the most intense concentration typically occurs between 20 km and 30-35 km [c1, c2, t2]. This layer plays a vital role in shielding the Earth by absorbing harmful ultraviolet (UV) radiation [c4, t8]. Because the majority of the ozone mass and its peak concentrations are contained within the 20 to 50 km range, option 3 is the most accurate description of where ozone is mostly found.

Sources

1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 20: Earths Atmosphere > Ozone (O3) > p. 272
2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 20: Earths Atmosphere > Ozonosphere > p. 276
3. [3] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 6: Environmental Degradation and Management > ozone depletion > p. 11
4. [4] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 1: BASIC CONCEPTS OF ENVIRONMENT AND ECOLOGY > Dirunion of Atmosphere > p. 7
5. [5] https://csl.noaa.gov/assessments/ozone/2022/downloads/twentyquestions/Q1.pdf
6. [6] https://ozone.unep.org/20-questions-and-answers