The aqueous solutions of various amines are used as chemical absorbents in gas treating processes. It is considered that aqueous ammonia can be used as a promising solvent for CO₂ capture. Apart from the many advantages of ammonia as a CO₂ capture solvent, its major drawback is high volatility. As a consequence, a large amount of ammonia can be released into the atmosphere. In this paper we investigated the effects of process parameters on ammonia emissions from the absorber used for CO₂ capture. Ammonia solution withdrawn from the ammonia recovery tower of the Solvay Process was used as solvent. During the research, the absorber pressure, liquid to gas flow ratio (L/G) and concentration of ammonia have been varied. In addition, a novel simple method for quantitative analysis of absorbed CO₂ in the ammonia solvent was described. We found that increasing the L/G ratio and ammonia concentration in the solvent resulted in a growth of ammonia emissions. The amount of released ammonia from the absorber was in the range 14-46 mg/dm³. However, it is important to note that no emission reduction devices were applied. The test of CO₂ capture using aqueous ammonia was satisfactory, with more than 90% of the inlet CO₂ stream being removed.