How does the NFPA 704 system categorize hazards?

• A. By color only
• B. By health, flammability, reactivity, and special hazards
• C. By chemical composition
• D. By environmental impact

Answer: (B)

The NFPA 704 system categorizes hazards by utilizing a color-coded system that assesses a variety of risks associated with hazardous materials. This system specifically evaluates four key categories: health hazards, flammability hazards, reactivity hazards, and special hazards. Each category is represented by a specific color and a numerical rating scale from 0 to 4, with 4 indicating the highest level of danger.

The health hazard category denotes potential harm to health from exposure to the material, while the flammability category measures the material's susceptibility to ignite and burn. Reactivity reflects how likely a substance is to undergo a chemical change under various conditions, and special hazards include specific identifiers for radiation, acid, or other unique risks. This comprehensive approach allows emergency responders to quickly assess the dangers presented by a material and take appropriate safety measures when responding to incidents involving hazardous substances.

Other options such as categorizing by color only, chemical composition, or environmental impact do not encompass the full scope of hazards that the NFPA 704 system aims to address, which is centered on immediate health and safety risks during emergencies.