The aim of this experiment was to analyze the changes of ammonia production and greenhouse gases in frequent type of stables for dairy cows in winter. Two analyzed stables were situated side by side, one of which is after reconstruction of housing and ventilation technology and the second stable remained in original state. Variances of the mass concentration of gases differed significantly (P < 0.05), and the production of all gases monitored in winter was higher in the original stable. The average ammonia production was 2.45 ± 1.9 mg/m3 in the reconstructed stable, while in the original stable it was 5.1 ± 2.7 mg/m3. Average CO2 production was nearly twice higher in the unreconstructed building, namely 2,045.5 ± 862.3 mg/m3, while in the renovated facility it was 1,254.2 ± 416.2 mg/m3 (P < 0.05). The described type of reconstruction provides increased comfort for animals, which gives rise to a significant increase in production parameters, but also allows up to twice the reduction of hazardous pollutants such as CO2 and ammonia
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