Is it true that 1/2% of Ammonia is a deadly concentration?

The statement that 1/2% of ammonia is a deadly concentration is true. Ammonia is a highly toxic substance, and even low concentrations can have serious health effects. At levels around 0.5%, individuals may experience respiratory distress, irritation of the eyes, throat, and skin. Concentrations above this level can lead to more severe health hazards, including potential fatality, depending on exposure duration and individual sensitivity.

In the context of safety and health regulations, it’s crucial to recognize that even small amounts of ammonia can pose significant risks, making the identification of its hazardous levels critical in industrial and environmental safety. Therefore, the statement highlights the importance of understanding ammonia's toxicity and the need for precautionary measures in its handling and usage.