How is the thickness of the ozone in a column of air from the ground to the top of the atmosphere measured?

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Editor">Editor Staff asked 4 weeks ago

How is the thickness of the ozone in a column of air from the ground to the top of the atmosphere measured?
 
(a) Dobson units
 
(b) Hertz
 
(c) Centimeter
 
(d) Ampere
 
I have been asked this question during an interview.
 
My question is from Environmental Issues in chapter Environmental Issues of Biology – Class 12

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Editor">Editor Staff answered 4 weeks ago

Right option is (a) Dobson units
 
Explanation: Dobson unit (DU) is used to measure the thickness of the ozone in a column of air from the ground to the top of the atmosphere. A layer of pure ozone that is 0.01 mm thick at standard temperature and pressure is equivalent to one Dobson unit.