Ozone layer thickness is measured in:

Correct option is B

The correct answer is (b) Dobson unit.
· Dobson unit (DU) is the unit used to measure the thickness of the ozone layer in the Earth's atmosphere.
· It represents the amount of ozone in a column of the atmosphere and is named after the British scientist Gordon Dobson, who conducted extensive research on atmospheric ozone.
Information Booster:
· Sievert unit: Used to measure radiation dose.
· Decibels: Used to measure sound intensity.
· Del unit: Not a standard measurement unit for ozone or environmental factors.