Question

Tell the units in which the thickness of the ozone in a column of air from the
ground to the top of the atmosphere is measured

Answer 1

• A dobson unit is the most basic measure used in ozone research. One Dobson Unit (DU) is defined to be 0.01 mm thickness at STP (standard temperature and pressure).
• Ozone layer thickness is expressed in terms of Dobson units, which measure what its physical thickness would be if compressed in the Earth's atmosphere.
• A normal range is 300 to 500 Dobson units, which translates to an eighth of an inch-basically two stacked pennies.
• The unit is named after G.M.B. Dobson, one of the first scientists to investigate atmospheric ozone.
  

So the correct option is 'dobson units'.