Question

Write the unit used for measuring ozone thickness.

Answer 1

The ozone layer is defined as a thin part of the Earth's atmosphere that is capable of absorbing almost all of the sun's harmful UV light. "Ozone holes" are popular terms for areas of damage to the ozone layer. This is not accurate. Ozone layer damage is more similar to a really thin patch than a hole.

Complete answer:
Let’s start with, the ozone layer or ozone shield is an area of Earth's stratosphere which absorbs the majority of the Sun's ultraviolet radiation. It consists of a high concentration of ozone as compared to other parts of the atmosphere, although still little in relation to other gases present in the stratosphere. The ozone layer consists of less than 10 parts per million of ozone. On the other hand, the average ozone concentration present in Earth's atmosphere together is about 0.3 parts per million. The ozone layer is mainly located in the low part of the stratosphere, from approximately 15 to 35 kilometres above Earth, moreover its thickness is variable depending seasonally and geographically
Keep in mind, The Dobson Unit is used to describe how much ozone there is present in the column if it were all squeezed into one layer.
Always remember, the ozone layer is seen in the stratosphere and acts as a shield which helps by absorbing ultraviolet radiations from the sun, the thickness of ozone in a column of air, measured from the ground till the top of the atmosphere is measured in Dobson units (DU).

Additional information:
The concentration of ozone above a location on the Earth changes naturally with latitude, season, and by day-to-day. Normally, the ozone layer is very thick at the poles and is thin around the equator.

Note:
You should always remember that, Dobson spectrophotometer is the instrument, now termed as the Dobson spectrophotometer, tells us the intensity of sunlight at two ultraviolet wavelengths respectively–
1. one that is strongly absorbed by ozone, and
2. one that is weakly absorbed.