AdBlue is the trading name for AUS32 (Aqueous Urea Solution 32.5%). It is a liquid, which is injected into exhaust gases of modern diesel engines, as part of a post-combustion cycle. AdBlue reduces the volume of harmful NOx (Nitrous Oxides) in vehicle emissions, therefore reducing the negative environmental impacts of vehicle emissions. The chemical reaction which AdBlue is required for, takes place within a special piece of equipment called an SCR. The requirements to reduce vehicles harmful emissions (pollutants) are specified in European legislation – Euro 4, 5 and 6.
In order to reach the reduced levels of pollutants as defined within current and future European legislation, vehicle manufacturers are now required to incorporate either SCR (Selective Catalytic Reduction) or EGR (Exhaust Gas Recirculation) technology. The use of AdBlue has increased significantly as a result of frequently updated European legislation, which requires its use in manufacturing and in commercial fleet activity.