Measurements of the optical thicknesses produced by particulate matter extinction and nitrogen dioxide absorption at window wavelengths in the visible and near-infrared spectral range were taken with four examples of a multiwavelength sun photometer. Evaluations of the vertical content of nitrogen dioxide were made by examining these measurements with a procedure which attempts to separate gaseous absorption from particulate extinction, represented in terms of Ångström’s formula. Moreover, assuming that the vertical content of NO₂ and Ångström’s turbidity parameters are given by the average values calculated with this procedure, we obtained a set of useful correction factors for the monochromatic calibration values of the four sun photometers.

© 1985 Optical Society of America

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