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Ammonia (NH3) emissions from agricultural sources affect the air quality in negative manner. The objective of this study was to quantify NH3 emissions from a commercial broiler farm by measuring weekly averages of atmospheric NH3 at different locations at the same time during two growing cycles. Thus, it was possible to analyze the spatial occurrence of NH3 in air and assess the environmental impact of the farm. For detecting NH3 in air, passive sampling was used at five locations in the immediate vicinity of the farm. The inside NH3 concentrations and the performance of the air volumetric flow rate were measured continuously during the growing cycles inside one broiler barn. In addition, the wind direction was detected.