What is the purpose of adding urea to large buses?

[OwenFitz]

The role of adding urea to large buses is as follows: 1. Urea is used for diesel engines because they emit nitrogen oxide pollutants during operation. To reduce the harm of these gases to the atmosphere and humans, urea is employed. When urea encounters nitrogen oxides emitted by diesel engines, 2. it converts them into nitrogen and water, both of which are harmless to the atmosphere and human health. Below is additional information about automotive urea: 1. In vehicles, it primarily serves to purify exhaust gases by reacting with nitrogen oxides in the exhaust to reduce their emissions. With increasingly stringent emission testing for heavy-duty trucks and buses, failure to use automotive urea results in non-compliance. 2. Automotive urea also optimizes engine performance and fuel consumption, reducing diesel consumption by up to 5-7%. 3. Urea is added to treat NOx (nitrogen oxides). Without urea, exhaust emissions cannot meet standards. 4. It is used in cars, trucks, buses, and heavy-duty non-road diesel engine vehicles equipped with SCR systems to purify exhaust gases, reduce nitrogen oxide emissions, optimize engine performance and fuel consumption, and cut diesel consumption by up to 6%, significantly lowering costs.