Is the automotive urea tank toxic?

[RileyLee]

The automotive urea tank is non-toxic to the human body. It consists of a urea tank, diesel exhaust fluid (DEF), and an SCR catalytic reaction tank. The operation process of the SCR system is as follows: when nitrogen oxides are detected in the exhaust pipe, the urea tank automatically sprays DEF. The DEF and nitrogen oxides undergo a redox reaction in the SCR catalytic reaction tank, producing non-polluting nitrogen and water vapor, which are then discharged. Automotive urea is a high-purity transparent liquid with a faint ammonia odor. It is alkaline but non-toxic. If the vehicle is not loaded with DEF, or if the purity is insufficient, or if the quality is inferior, the vehicle's engine will automatically decelerate. Inferior quality DEF can pollute the catalyst in the SCR catalytic reaction tank, leading to serious consequences.