Abstract
The product of visual range in the atmosphere and mass concentration of aerosol is constant for a given distribution of particle size; if the distribution is broken down into a set of size ranges the contributions of each are additive with respect to the reciprocal of the visual range. Using this rule, the manner in which the visual range in an atmospheric aerosol depends on the size distribution is illustrated by examples. Study of experimental observations shows that sampling mists with cascade impactors does not catch droplets with radii below 0–5 μm which may make a significant contribution to reducing the visual range. Aitken nuclei may also be present with mist droplets. Failure to include fine droplets and particles accounts for measured visual ranges sometimes being lower than calculated values. There is no indication of failure of the Koschmieder law and Middleton's contrast equation.
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