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A refrigeration system that uses Ammonia Anhydrous in the liquid phase and the gas phase. The refrigeration system has the potential for gas leakage which poses a risk to worker safety as well as environmental pollution to water bodies and air pollution. This risk might have an impact on employees in the factory area and could extend to the surrounding community. This study is intended to be able to analyze the risk of pollution accurately before installing the refrigeration installation. In this study the analysis method that will be used is the statistical method and the use of mathematical models supported by Aloha software. The distribution of pollutants from ammonia gas leakage is influenced by several factors, including the capacity of the refrigeration system, meteorological conditions, and land use. The use of Aloha software in the prediction of zones affected by the spread of toxic substances in the atmosphere can calculate and predict the area affected by leakage events. With modeling done, will get map of concentration and impacted area. The direction and magnitude of the impact of pollution will be known immediately and the potential losses that may arise will be minimized.