Anhydrous ammonia is caustic, and therefore also can burn. Because of its high affinity for water, it readily absorbs water to create a dilute ammonium hydroxide, which is a component of lye. Anhydrous is not dangerous when handled properly, but if not handled carefully it can be extremely dangerous. It is not as combustible as many other products that we use and handle every day. However, concentrations of gas burn and require precautions to avoid fires.
Mild exposure can cause irritation to eye, nose and lung tissues.
Prolonged breathing can cause suffocation. The human eye is a complex organ made up of nerves, veins and cells. The front of the eye is covered by membranes that resist dust and dirt. None of these can resist anhydrous ammonia, because the entire eye is about 80 percent water. A shot of ammonia under pressure can cause extensive, almost immediate damage to the eye.