What does the NFPA 704 hazard diamond indicate?

• A. It indicates the material's flammability only.
• B. It indicates the material's health hazard only.
• C. It indicates the hazard category and numbers for temperature.
• D. It indicates health, flammability, reactivity, and special hazards with numeric values and symbols.

Answer: (D)

The NFPA 704 hazard diamond is a quick-reference system that communicates a material’s hazards across four areas: health, flammability, reactivity, and special hazards. Each of the first three areas is color-coded (blue for health, red for flammability, yellow for reactivity) and carries a number from 0 to 4, where higher numbers mean greater hazard. The white section lists any special hazards with symbols or notes (such as a W with a slash for water reactivity, or symbols for oxidizers, acids, bases, or radioactive hazards). This arrangement lets responders quickly assess how dangerous a material is to people, how easily it could ignite, how it might react, and any unusual hazards, guiding decisions on handling and protective measures. It’s not about temperature, and it covers multiple hazard dimensions, not just one.