The flue gas consists of carbon dioxide compounds. These flue gases pollute the environment the most. Therefore, chimney measurements should be made in accordance with international standards and norms. Boiler measurement increases boiler efficiency and provides additional fuel savings. Of course, this requires proper measurement of the flue gas. As everyone knows, rapid urbanization and industrialization have a negative impact on the environment. Too much gas polluting the air. Some are O2, CO, CO2, SO2, HC, NOx (NO and NO2) gases. It is important to remember that proper and good flue analysis is necessary to control oxygen and carbon gases that cause air pollution.