The EU has already released a few years ago very strict on heavy-duty diesel vehicle emissions of Euro IV and Euro V discharge standards on the implementation of the early 20th century. Compared with the previous emission standards to reduce emissions of nitrogen oxides by 60%, reducing the 80 percent of particulate matter emissions. With car ownership in China continue to increase, vehicle emissions has become an important source of pollution. Recently, the State Council executive meeting, the deployment of ten measures of air pollution control (hereinafter referred to as the "State 10"). Among them, the vehicle emissions pollution emphasis is referred to as the agenda. At the same time, was postponed for several years Stage IV emission standards for motor vehicles are July 1, 2013 fully implemented, car urea solution will undoubtedly be using SCR exhaust after-treatment system as in previous years the EU car has released a very strict on heavy-duty diesel vehicle emissions of Euro IV and Euro V discharge standards on the implementation of the early 20th century. Compared with the previous emission standards to reduce emissions of nitrogen oxides by 60%, reducing the 80 percent of particulate matter emissions. With car ownership in China continue to increase, vehicle emissions has become an important source of pollution. Recently, the State Council executive meeting, the deployment of ten measures of air pollution control (hereinafter referred to as the "State 10"). Among them, the vehicle emissions pollution emphasis is referred to as the agenda. At the same time, was postponed for several years Stage IV emission standards for motor vehicles are July 1, 2013 fully implemented, car urea solution will undoubtedly be using SCR exhaust aftertreatment system for a vehicle as a necessity. Cars urea (car urea, urea green car) is the scientific name is diesel exhaust treatment fluid. Applied to a diesel engine. It is a must in the SCR technology to use consumables, used to reduce diesel exhaust in liquid nitrogen oxide pollution. Its composition is 32.5% urea and 67.5% high purity deionized water.