AdBlue is an ultra pure solution of urea in demineralised water, used in the latest generation of commercial diesel vehicles for the removal of Nitrous Oxide, an environmental pollutant. It consists of high purity urea dissolved and suspended within deionized water. The ratio of the mix is approximately 32.5% urea and 67.5% deionized water. It is used by modern diesel engines which are equipped with an SCR, AdBlue never comes into contact with the fuel, and it is a common misconception that it is an additive. AdBlue is carried onboard the vehicle in a separate vessel to the fuel storage tank. It is injected into the exhaust gases as a post combustion process through an SCR where it breaks harmful Nitrous Oxide emissions down into mostly Nitrogen and Oxygen. The use of AdBlue benefits everyone it helps the environment by reducing the number of harmful emissions created by diesel engines and it helps fleet operators and drivers reduce fuel costs. It is likely that further savings will be made in the future as governments are anticipated to introduce new carbon taxes and penalties for individuals who do not take necessary action to reduce damage impacted on the environment.