The results of the theoretical calculation of optimum wavelengths for the detection of the minor gas components in the ground layer of the atmosphere are presented. The experimental results of the investigation of atmospheric gas composition over the industrial zone of Akademgorodok of Tomsk carried out with the laser gas analyzer are obtained as part of the SATOR–91 program. The correlations are found between the temporal variations of concentrations of ozone and carbon dioxide and of ozone and ammonia.