Ammonia is a corrosive, colorless, gas with a sharp odor.
Some liquids release ammonia gas. Ammonia is used to make household cleaners, refrigeration units, fertilizers, explosives, fuels and other chemicals. Humans and animals release ammonia in urine. People are usually exposed to ammonia by breathing air that contains the gas. Liquids that contain ammonia can cause exposure by direct contact with the liquid or by breathing ammonia gas released from the liquid.