What's the harm to people with urea solution in car

High-purity urea consisting of 32.5% and 67.5% deionized water is used to reduce NOx pollution in diesel vehicle exhaust. The general situation is not harmful to the human body, the high temperature environment urea solution may free out ammonia, ammonia to contact skin tissue has corrosion and stimulation, long-term exposure to ammonia, some people may appear skin pigmentation or finger ulcers and other symptoms.