What is the purpose of adding urea to large buses?

[CatherineLee]

The functions of adding urea to large buses are: 1. It can purify exhaust gases, as urea reacts with nitrogen oxides in the exhaust to reduce their emissions; 2. Urea can optimize engine performance and fuel usage; 3. It reduces pollutant emissions and purifies exhaust gases, ensuring that vehicle emissions meet standards. Automotive urea is a liquid used in SCR (Selective Catalytic Reduction) technology to reduce nitrogen oxide pollution in diesel vehicle exhaust, making it an essential consumable for diesel vehicles. Automotive urea chemically reacts with nitrogen oxides in vehicle exhaust to produce non-toxic nitrogen and water, thereby reducing toxic substances in the exhaust. If automotive urea is not added to the vehicle, the urea nozzle, which is constantly exposed to high temperatures in the exhaust pipe, can easily oxidize and lead to clogging of the vehicle's exhaust pipe.