Visitors to UK filling station forecourts will likely have seen AdBlue® dispensers and containers on sale. Developed as part of the push to lower vehicle pollutant emissions, these products – formally known as nitrogen oxide (NOx) reduction agents – are more commonly known as AdBlue® and diesel exhaust fluid (DEF). When used in diesel vehicles designed for them, such NOx reduction agents enable significant reductions in a vehicle’s NOx emissions.
Whilst drivers should always consult their vehicle handbook for specific information related to their make and model, the following information is nonetheless intended to help consumers and forecourt operators understand what a NOx reduction agent like AdBlue® is, how it works and other important advice such as housekeeping guidance for this pollutant reducing technology.
What are NOx reduction agents?
NOx reduction agents are a high purity aqueous solution of urea used by many modern diesel vehicles – both Heavy Goods Vehicles (HGVs), light commercial vehicles and passenger vehicles – which feature a Selective Catalytic Reduction (SCR) system.
Via the SCR, these significantly reduce the level of NOx emissions from a vehicle’s exhaust. Widely mistaken to be a fuel additive, NOx reduction agents never come into contact with fuel, having a separate (usually blue) filter cap located either next to your fuel filler, in the boot or under the bonnet of your vehicle.
NOx reduction agents are available at filling stations, garages, motor retailers and supermarkets in different quantities – from dedicated dispensers to up to 10 litre containers.