Selective Catalytic Reduction (SCR) is an after treatment technology that uses of an Aqueous Urea solution called AdBlue® to reduce harmful NOx emissions.

All major OEM’s have use this technology to meet the emission legislation on NOx emissions The main components of the SCR system are the AdBlue® dosing control and injection unit, SCR catalyst and the AdBlue® tank itself.

AdBlue® is injected into the exhaust stream in front of the catalytic converter where it hydrolyses to ammonia and starts the chemical process of converting the nitrogen oxides (NOx) in the exhaust to nitrogen and water vapor.

For the SCR system to work correctly only use high quality AdBlue® such as CleanAirBlue™.