Why do modern diesel vehicles require urea fluid?

[NadiaLynn]

Diesel vehicles use urea fluid to reduce exhaust emissions and protect the atmospheric environment. The purpose of adding urea is to convert harmful nitrogen oxides in the exhaust into nitrogen and water. Engine exhaust poses severe pollution risks to the atmosphere, and as environmental regulations become increasingly stringent, exhaust treatment systems have been developed to ensure compliance. The primary harmful components in diesel exhaust are nitrogen oxides and particulate matter. The exhaust treatment system helps reduce particulate emissions. Once urea is introduced into the system, it is injected into the exhaust treatment unit whenever the engine is running. Under high temperatures, the urea decomposes into ammonia gas.