Studies of atmospheric ozone—its origin, three-dimensional distribution, and time variation—have involved an increasing number of atmospheric scientists and research programs, particularly during the past 25–30 years. The major interest in ozone stems from its central role in establishing the thermal structure affecting the dynamics of the stratosphere and mesosphere and as a possible link in climate changes induced by solar effects. In addition, ozone variations regulate solar UV irradiance transmitted through the atmosphere, thus affecting photochemical, biological, and ecological processes near and at Earth's surface. The results of the various studies have been reported in the open literature and in published proceedings of different national and international conferences and workshops.