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Observations of several atmospheric species can be performed by measuring the absorption of visible and near‐ultraviolet light scattered from the zenith sky. The determination of vertical column abundances of molecules such as ozone and NO 2 from such measurements is briefly reviewed. It is shown that the conversion of NO to NO 2 can be of significance in the interpretation of measurements made near twilight. On the other hand, multiple scattering from the atmosphere or by clouds is likely to be a very small effect.
Solomon et al. (1987) studied this question.