Cement is the main ingredient of concrete, which is the most common building material in the world. Cement industry is one of the biggest CO2 emission producers mainly due to the huge production capacities and calcination process, which is important part of the cement production.

In cement plants, the flue gas generally includes carbon dioxide (CO2), nitrous oxides (NOx), sulfur dioxide (SO2), mercury and dust. SO2 emissions are mostly derived from the raw material, whereas the CO2 emissions are related to the used fuel and efficiency of the combustion process. Cement manufacturers need to monitor these emissions continuously according to local emission regulations.