A Totally-Encapsulating Chemical Protective (TECP) suit that provides protection against CBRN agents. A NIOSH-certified CBRN full-face-piece SCBA operated in a pressure-demand mode or a pressure-demand supplied air hose respirator with an auxiliary escape bottle. This is the maximum protection for workers in danger of exposure to unknown chemical hazards or levels above the IDLH or greater than the AEGL-2. 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. Ingestion is an uncommon route of exposure. Inhalation is an important route of exposure. 
ROUTES OF EXPOSURE: Mustard-Lewisite mixture can be absorbed into the body by inhalation, ingestion, skin contact, or eye contact. Agricultural: If mustard-lewisite mixture is released into the air as a liquid spray (aerosol), it has the potential to contaminate agricultural products. Outdoor Air: Mustard-Lewisite mixture can be released into outdoor air as a liquid spray (aerosol). Indoor Air: Mustard-Lewisite mixture can be released into indoor air as a liquid spray (aerosol). Odor however, should not be depended on to detect mustard-lewisite mixture. Mustard-Lewisite mixture may have a garlic odor. The mustard-lewisite mixture requires lower ambient temperatures before it will freeze this property allows for improved ground dispersal and aerial spraying. 
Exposure to large amounts of mustard-lewisite may be fatal. It is both a blister agent (vesicant) and an alkylating agent (causes damage to the DNA of rapidly dividing cells). DESCRIPTION: Mustard-lewisite (military designation HL) is a mixture of two chemical warfare agents (sulfur mustard and lewisite) and has some properties of both.
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