Why Do Some Diesel Vehicles Need to Add Urea?

[FinleyFitz]

Some diesel vehicles add urea to reduce exhaust emissions and protect the atmospheric environment. The purpose of using urea in vehicles is to convert harmful nitrogen oxides in the exhaust into nitrogen and water. The exhaust emitted by engines is highly polluting to the atmosphere. With increasingly stringent environmental regulations, exhaust treatment systems have been developed to ensure compliance. The primary harmful substances in diesel exhaust are nitrogen oxides and particulate matter. The exhaust treatment system can reduce particulate emissions. Once urea is used in the vehicle, it is injected into the exhaust treatment system as long as the engine is running. Under high temperatures, urea decomposes into ammonia gas.