Which standard addresses vapor-protective ensembles for emergency services?

The standard that addresses vapor-protective ensembles for emergency services is NFPA 1991. This standard specifically specifies the requirements for protective clothing designed to protect emergency responders from hazardous materials, including vapors and gases. NFPA 1991 outlines criteria for the design, performance, testing, and certification of these ensembles, ensuring that they effectively safeguard the wearer against exposure to harmful substances.

In contrast, the other standards focus on different aspects of protective clothing. NFPA 1971 pertains to structural firefighting protective clothing, designed primarily for high temperatures and flame exposure, rather than vapor protection. NFPA 1982 addresses personal alert safety systems (PASS) for firefighters, which are used for locating emergency responders who may become incapacitated. NFPA 1994 covers protective clothing for chemical, biological, radiological, and nuclear incidents but does not specifically focus on vapor protection as NFPA 1991 does. Thus, NFPA 1991 is the correct choice as it directly relates to vapor-protective ensembles specifically designed for emergency services dealing with hazardous materials.