Principle of Emission Reduction of Diesel Exhaust Treatment Fluid Yitong diesel exhaust treatment fluid is an essential reducing agent for SCR systems. SCR is an exhaust gas post-treatment technology. It uses diesel exhaust treatment fluid to treat nitrogen oxides in the exhaust gas and then discharges them. Urea and water are in an appropriate ratio (usually 32.5 %) and inject into the exhaust gas discharged from the diesel engine to reduce the NOX in the exhaust gas to harmless N2 (nitrogen) and H2O (water vapor)
