A) Decibel
B) Dobson Units (DU)
C) Parts Per Million (PPM)
D) Cubic Centimeter
Correct Answer: B
Solution :
Ozone hole is measured in Dobson Units (1 Du = 1 ppb). Ozone hole is the declining of ozone layer thickness in spring time zone and it was first discovered in 1985 over Antartica and was also confirmed above Arctic in 1990. Decibel is unit of sound ppm (part per million) and cubic centimeter are another unit used to measure number/quantity and area respectively.
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