AdBlue (Diesel Exhaust Fluid) is a specially formulated liquid used in Selective Catalytic Reduction (SCR) systems to minimize harmful nitrogen oxide (NOx) emissions in diesel engines. It is composed of a precise mixture of urea and demineralized water, injected into the vehicle’s exhaust stream before the SCR catalyst. This process chemically transforms toxic NOx emissions into harmless nitrogen and water vapor, ensuring compliance with stringent environmental regulations.

AdBlue is widely used in modern diesel vehicles, particularly in commercial trucks, buses, agricultural machinery, and heavy-duty equipment, to meet emissions standards. However, its usage comes with significant drawbacks, including additional running costs, regular refilling, and potential system failures.