The gaseous compounds of sulfur play an important role in the pollution of atmospheric air. The most widespread pollutant in the troposphere is sulfur dioxide, which is produced primarily as the result of combustion of fuel oil. However, research conducted by a number of authors, indicates that sulfur compounds, both in gaseous and aerosol form, occur everywhere in the stratosphere as well as in the troposphere. To measure the concentration of sulfur dioxide, we used the method of West and Gaeke as the most sensitive of the methods usually employed; this method makes it possible to determine the concentration of sulfur dioxide in the solution being analyzed with an accuracy up to 0.1 microgram. The analytical method of West and Gaeke enjoys a considerable advantage in comparison to other methods, in the fact that when it is used it is the gas itself which is trapped, and the presence of sulfate aerosols in the atmosphere has no effect.