How O3 is Measured: Dobson
Unit
¥Ozone can be measured by the depth of ozone if all ozone in a column of
atmosphere is brought to sea-level temperature and
pressure.
¥One Dobson unit corresponds to a 0.01 mm depth at sea-level temperature
and pressure
¥The ozone layer is very thin in Dobson
units.
There are only a few millimeters (few
hundred Dobsons) of
total ozone in a column of air.