The thickness of ozone in a column of air from the ground to the top of the atmosphere is measured in terms of:

Thickness of ozone in a column of air from the ground to the top of atmosphere is measured in terms of

The thickness of ozone is a column of air from the ground to the the top of the atmosphere is measured in terms of .

Thickness of ozone in a column of air from ground to the top of atmosphere is measured in

The thickness of the ozone is measured in terms of

Thickness of ozone is measured in

How the amount of atmospheric ozone is measured ?