Passive Infrared (IR) Spectral-radiometry of gases in the atmosphere is extremely important today, when pollution of the environment by natural ejections and those produced by human activity is growing very high. Particularly, spectral analysis of hot gas ejections i.e. combustion products from industrial plants is an essential part of ecological monitoring of the atmosphere. In this paper we present the results of IR spectral analysis of hot gas ejections from industrial plants in the spectral range from 2.5 to 5.5µm, at a distance of 3000m. The obtained with a hydrocarbon gas group, SO2, N2 O, CO and CO2 gases, as well as H2 O vapor. Relative content of ejected gases (to CO-CO2 group) per unit time was evaluated by means of an integral intensity ratio for each gas. Distant IR Spectral analysis of hot gas ejections (both industrial firms, and various vehicles) have huge value, in particular at ecological monitoring of an environment.