What standard describes vapor protective clothing for hazardous chemical emergency response?

The standard that describes vapor protective clothing for hazardous chemical emergency response is NFPA 1991. This particular standard provides detailed requirements for the design, performance, and testing of vapor-protective ensembles used by emergency responders when dealing with hazardous materials. It outlines the specific criteria necessary to ensure that the clothing can effectively protect responders from exposure to vapors and other forms of chemical hazards.

In contrast, other standards serve different purposes. NIOSH 789 relates to methods of sampling and analysis for hazardous materials, thus it does not focus on protective clothing. NIST 800-53 provides a framework for improving the security and privacy of federal information systems, which is unrelated to hazardous material response. OSHA 1910 covers general industry safety and health regulations but does not specifically detail standards for vapor protective clothing. Therefore, NFPA 1991 is recognized as the comprehensive source for ensuring the safety and effectiveness of protective garments in chemical emergency situations.