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Q.

Dobson units (DU) are used to measure

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a

the levels of radioactive wastes

b

the levels of noise in air

c

thickness of ozone in stratosphere

d

the levels of particulate matter

answer is B.

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Detailed Solution

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Dobson unit (DU) is the unit of measurement for the thickness of ozone.

dB (decibels) is the  unit of measurement for the intensity of noise.

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