This webpage is maintained by the Centers for Disease Control and Prevention (CDC). The webpage provides information and resources on Phosphine. "Phosphine is a colorless, flammable, and explosive gas at ambient temperature that has the odor of garlic or decaying fish. Small amounts occur naturally from the break down of organic matter. It is slightly soluble in water. Phosphine is used in semiconductor and plastics industries, in the production of a flame retardant, and as a pesticide in stored grain."
Centers for Disease Control and Prevention: http://www.cdc.gov/