AdBlue is a nontoxic solution liquid which consists of demineralized water and automotive urea (32,5%). Is stable, colorless and odorless, and meets ISO Standards 22241. AdBlue is injected into the exhaust gasses of a diesel powered engine to reduce the emission of nitrogen oxides (NOx) in combination with SCR (Selective Catalyste Reduction) -technology. AdBlue is not an additive for diesel. Other name AdBlue is AUS32, DEF and also ARLA32.