what is adblue used for

AdBlue is a diesel exhaust fluid used in vehicles with Selective Catalytic Reduction (SCR) technology to reduce harmful gases being released into the atmosphere. It is a 32.5% solution of high-purity, synthetically manufactured urea in de-mineralized water. AdBlue is a clear mixture of demineralized water and pure urea (32.5%) and is also referred to as Diesel Exhaust Fluid or AUS 32. It is designed to reduce harmful emissions of nitrogen oxides (NOx) from diesel vehicles to non-hazardous gases, in order to comply with more stringent emission standards. AdBlue is used in vehicles with a Selective Catalytic Reduction catalyst, or SCR, which ensures that exhaust gases are treated before they leave the vehicle. When a diesel vehicle goes in for a service, AdBlue should be topped up if necessary to make sure the exhaust gas cleaning system is working properly. If a SCR-equipped vehicle runs out of AdBlue, it will fail to start, but a warning message will appear on the dashboard.