What is the base of the OPAC number concentrations ?

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mhess
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What is the base of the OPAC number concentrations ?

The number concentrations and mixing ratios in OPAC have been compiled from the literature which was available up to the mid 1990's.

They are to be considered as climatological values and may differ considerably from actual values in certain situations. Limits for such deviations cannot be given.

For further information, please read the OPAC paper or ask a question in the OPAC Forum.