Chimney gases contain substances that contain carbon dioxide, which pollutes the environment to the maximum. Therefore, chimney measurements should be carried out in accordance with international standards and norms. Chimney measurement increases gas efficiency and provides additional fuel savings. Of course, the correct measurement of flue gas is an important condition for this. As is well known, rapid urbanization and industrialization have a serious negative impact on the environment. There are many gases that pollute the air. Examples of such gases are O2, CO, CO2, SO2, HC, NOx (NO and NO2). In order to control the gases that cause air pollution, it is important to remember that the flue measurement analysis is performed correctly and well.