Abstract
This chapter discusses the triad of measurements usually used to monitor the effects of haze on landscape features. The discussion focuses on measurements of atmospheric optical variables that are most directly related to characterizing visibility impairment of landscape features, with some attention given to the relationship between visibility metrics derived from webcam-type images and atmospheric extinction. Techniques for extracting atmospheric extinction and plume opacity from teleradiometer measurements are discussed. Measurements of the atmospheric scattering and volume scattering coefficients are presented, as are measurement techniques for determining atmospheric absorption. A short discussion of long-path transmissometry is presented, as well as techniques for localized measurements of atmospheric extinction. Because there are many journal articles and books on the measurement of atmospheric particle chemical and physical properties, only passing attention is given to this subject.
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