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Name: Bradley M.
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What is the unit of measure scientists use for measuring atmospheric ozone levels?

The most popular unit is the Dobson Unit, which gives an idea of the total amount of ozone above a given area of Earth's surface. Imagine all of the ozone above an part of the earth's surface brought down to the surface and sequestered into a layer by itself. The ozone level in Dobson Units tells the thickness of this layer in units of 0.01 mm. So, if the layer would be 1 mm thick, that would be an ozone level of 10 DU.

See the further explanation at the web site for the Total ozone Mapping Spectrometer:

Richard Barrans
Department of Physics and Astronomy
University of Wyoming


Near the Earth's surface the unit used for the concentration of ozone is ppb (part per billion).

For a column of ozone (from ground to top of the atmosphere) the unit used is the Dobson Unit. See for more information on total ozone mapping and the Dobson unit.

David R. Cook
Climate Research Section
Environmental Science Division
Argonne National Laboratory

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