Abstract
This review consists of a summary and comparison of the results of ongoing programs to study the stratospheric aerosol by a variety of techniques. In view of the considerable degree of disagreement among various experimental techniques in the past, the importance of comparative studies is emphasized. Many of the results are still in preliminary form, and only relatively new results are presented.Both remote and insitu measurements are discussed; the former consist mainly of lidar observations while the latter comprise impactor sampling and light-scattering particle detectors. Discussion is divided along traditional lines, i.e., by particle size, with "small" particles those of radii ≤0.1 µm and "large" particles those of radii ≥ 0.1 µm, with emphasis on the latter because of the considerably greater body of knowledge available for these particles.

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