Suitable environmental parameters have to be ensured to intensify broiler growing. One of these is the microclimate in the growout house, determined by suitable heating/cooling, humidity and air composition. The composition of air in the growout house for broilers differs significantly from that of atmospheric air, and contains more carbon dioxide and pollutants (ammonia, hydrogen sulphide). This paper presents the effects of beneficial microorganisms on the concentration of gases (NH3, H2S, CO2), and the correlations of these gases during the four seasons of the year. In addition, a new approach to the technology of broiler growing in terms of the logistics of operations was proposed by the introduction of fogging in broiler growout houses using preparations containing beneficial microorganisms.