Discussion
Ozone layer thickness is measured in :
Answer: B
Ozone layer thickness is measured in Dobson units.
One Dobson unit is the amount of ozone that would form a layer 0.01 mm thick if all the ozone in a column of the atmosphere were compressed to standard temperature and pressure. A typical total is about 300 DU; an 'ozone hole' is usually defined as values below 220 DU.
Decibels measure sound intensity. PPB and PPM are concentration units used for gases near the ground, not for the total column of ozone overhead.
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