_Vehicle urea is a diesel engine exhaust treatment fluid, which is used in diesel engines to reduce nitrogen oxides pollution in diesel tail.

_With the increasing efforts of environmental protection and renovation, the requirements for automobile exhaust emissions are becoming higher and higher. As a green environmental protection product, automobile urea is coming to the market. Vehicle urea is mainly used in the treatment of exhaust gas of diesel locomotives such as heavy trucks and buses. Because of its catalytic reaction with vehicle exhaust gas, the emission of nitrogen oxides and particulates is reduced, thus the exhaust gas of diesel locomotives reaches the national standard.