NuvaBlue, also known as Diesel Exhaust Fluid (DEF), is a solution composed of 32.5% high-purity urea and 67.5% deionized water. It is a critical component used in Selective Catalytic Reduction (SCR) systems for diesel engines to reduce harmful emissions. AdBlue is non-toxic, colorless, and biodegradable, and its primary purpose is to lower nitrogen oxide (NOx) emissions, which are harmful pollutants produced during diesel combustion.