Although common in nature, and in wide use, ammonia is both caustic and hazardous in its concentrated form. It is classified as an extremely hazardous substance in the United States, and around the world. Ammonia is an irritant and irritation increases with concentration; the permissible exposure limit is 25 ppm, and lethal above 500 ppm.
- Precursor to nitrogenous compounds
- As a cleaner
- Antimicrobial agent for food products
- For remediation of gaseous emissions