what is adblue

AdBlue, also known as diesel exhaust fluid (DEF) or AUS 32, is a liquid used to reduce the amount of air pollution created by a diesel engine. It is essentially an aqueous urea solution made with 32.5% urea and 67.5% deionized water. AdBlue is consumed in a selective catalytic reduction (SCR) that lowers the concentration of nitrogen oxides (NOx) in the diesel exhaust emissions from a diesel engine. AdBlue is commonly used in exhaust systems of new diesel cars since the Euro 6 emissions regulations which have been in force for new diesel engines since 2016. AdBlue is composed of deionized water and urea, which is a chemical compound that is widely used in a variety of applications, including fertilizers.