Q. “Dobson Unit” is related to which of the following?
Explanation: The most common measure of total ozone abundance is the Dobson unit (named after the pioneering atmospheric physical Gordon Dobson) which is the thickness of the ozone column (compressed at Standard Temperature and Pressure (STP)) in milli-centimeters. At STP one Dobson unit is equal to 2.69×1020 molecules per square meter.
Source: SHANKAR IAS Environment