LEVEL A: (RED ZONE): Select when the greatest level of skin, respiratory, and eye protection is required. NOTE: Safe use of protective clothing and equipment requires specific skills developed through training and experience. Level A protection should be used until monitoring results confirm the contaminant and the concentration of the contaminant. GENERAL INFORMATION: First Responders should use a NIOSH-certified Chemical, Biological, Radiological, Nuclear (CBRN) Self Contained Breathing Apparatus (SCBA) with a Level A protective suit when entering an area with an unknown contaminant or when entering an area where the concentration of the contaminant is unknown. Exposure to phosgene (CG) may be irritating to the eyes and skin. Ingestion is unlikely, as phosgene (CG) is a gas at room temperature. ROUTES OF EXPOSURE: Inhalation is the primary route of exposure to phosgene (CG). Agricultural: If phosgene (CG) is released as a gas, it is highly unlikely to contaminate agricultural products. Outdoor Air: Phosgene (CG) can be released into outdoor air as a gas. Food: Phosgene is unlikely to contaminate food because it breaks down rapidly upon contact with water to produce hydrochloric acid and carbon dioxide. Water: Phosgene is unlikely to contaminate water because it breaks down rapidly upon contact with water to produce hydrochloric acid and carbon dioxide. Indoor Air: Phosgene (CG) can be released into indoor air as a gas. However, the odor is only detectable for a short amount of time when phosgene (CG) is initially released and should not be depended on as a reliable indicator of overexposure. At high concentrations, phosgene (CG) has a strong, suffocating, unpleasant odor. At low concentrations, phosgene (CG) smells like newly mown hay or green corn. Phosgene (CG) is shipped as a liquefied compressed gas in steel cylinders. Phosgene (CG) may also be released from household paint removers and degreasers when they are used in the presence of heat. Phosgene is used in the preparation and manufacture of many organic chemicals especially in the dye, pharmaceutical, herbicide, insecticide, metal ore extraction, synthetic foam, resin, polymer, and chlorinating agent industries. Small amounts of phosgene (CG) exist naturally in the atmosphere from the breakdown of chlorinated compounds. It was used during WWI by the German army, and has since become part of the chemical arsenal of many countries including the United States. DESCRIPTION: Phosgene (CG) was originally synthesized in 1812. 
Light yellow liquid when refrigerated or compressed. May have the appearance of a white cloud. Colorless, fuming liquid below 47☏ (8.2☌).
APPEARANCE: Colorless gas above 47☏ (8.2☌).
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