Background and Aims: Cement industries are known as one of the important sources of air pollution especially hazardous gases. Although several samples have been taken from stacks by environmental experts, accurate assessment of pollutant emissions, which can be used as basic modeling of air pollution and managing, is not available. The purpose of this study is to measure and investigate gases volumetric concentrations from stack of Doroud Cement Plant and finally compare with standards.Materials and Methods: The volumetric concentrations of gases (ppm) measured by Testo XL350 during a period of six months. After standardization of pressure and temperature on the ideal gas law, the detected values were converted to mass concentrations and then gases mass emission (g/s) was computed considering the stack flow.Results: Results showed that detected pollutants’ volumetric concentrations were higher than their standard levels for stack cement industrials (Electro Filter and Pre-heater). It has also been found that due to the use of oil fuel as a kiln fuel, the emissions of CO and SO2 gases increased in winter.Conclusion: This method can be applied as a model for gas emission. Long distance detection of gas pollutants should be considered for environmental monitoring of pollutants around cement industries.Key words: Mass emission, Pollutant gases, Doroud Cement Plan
