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In fuel-burning and technological installations of enterprises of heat and power, metallurgical, glass, chemical and petrochemical industries, enterprises of building materials production, railway transport, information-measuring systems for calculations of mass emissions (measurement of volume fraction of oxygen, carbon monoxide, carbon dioxide, carbon dioxide, nitrogen oxide, nitrogen dioxide, sulphur dioxide, carbon dioxide, sum of nitrogen oxides, sum of hydrocarbons, mass concentration of hydrogen sulphide, hydrogen chloride, ammonia, chlorine, calculations of excess air ratio) for each determined component and calculations of dust mass emissions, as well as control of exhaust gases of diesel locomotives according to GOST 33754-2016. Principles of measurements - electrochemical and optical-absorption.