The thickness of the ozone in a column of air from the ground to the top of the atmosphere is measured in terms of ______.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. Dobson Units (DU).
The Dobson Unit (DU) is the standard unit for measuring the total amount of ozone in a column of the atmosphere from the Earth's surface to the top. One Dobson Unit represents a layer of ozone that would be 0.01 millimeters thick under standard temperature and pressure. Normal ozone levels range from 250 to 500 DU.