The emission of harmful gases from livestock production, including poultry, is growing due to the increasing consumption of poultry meat in the world. This process is inherent to the adverse effects of gases on the environment. Thus, the removal of micro-pollutants becomes a leading task for environmental engineering. Taking into account the problem of harmful gases emission, the article focused on the analysis of gas concentrations in production of the poultry. The concentrations of ammonia (NH3), hydrogen sulfide (H2S) and carbon dioxide (CO2) were shown together with their impact on the environment and the quality of human life. The attention was directed to this growing problem and the search for new solutions the implementation of which could prevent environmental degradation. This disadvantageous phenomenon is mainly due to the impact of gases produced by the agricultural industry and animal production (80%). Current activities, which are aimed at reducing greenhouse gases generated at source during the production of animals, such as ammonia (NH3), hydrogen sulfide (H2S) and carbon dioxide (CO2), are focused on maintaining high welfare in the livestock room. Therefore, this article presented a method in which the microbial additive was used to minimize the concentration of harmful gases and emission to the natural environment. The study, which used a new method, was carried out during eight series of production on the poultry farm located in the Opole province. The battery farm consisted of two halls of the same area and with the same forced mechanical ventilation system. The article presents detail characteristics of the tested production cycles conducted under different atmospheric conditions (taking into account mean daily outdoor temperature). Individual cycles also slightly differed in terms of the number of inserted broilers. Small differences also related to the duration of cycles. The study estimated the mean concentration of ammonia (NH3), hydrogen sulfide (H2S) and carbon dioxide (CO2) obtained in each production cycle. The test gases were also assessed in terms of differences [ppm] per individual test series conducted in the control hall and the hall where the formulation containing beneficial micro-organisms was used. The study also measured the overall decline in the concentrations of the tested gases [ppm] in eight production series. Their emission turned out to be lower than the amounts generated in the control hall. The attention was directed to air pollution with offensive odours and the parallel possibility of reducing unpleasant scents by applying the new method using the microbial additive.