What is the primary purpose of the NFPA 704 rating system?

• A. To indicate health, flammability, reactivity, and special hazards of chemicals
• B. To measure environmental pollution levels
• C. To grade the quality of fertilizers
• D. To determine dosage in clinical trials

Answer: (A)

The main idea behind NFPA 704 is hazard identification for chemicals so responders can quickly assess risk. It uses a diamond with four colored sections: blue for health, red for flammability, yellow for reactivity, and a white section for special hazards. Each of the first three is rated from 0 (no hazard) to 4 (severe hazard), and the white area may show symbols likeOX for oxidizers or a W with a slash for water reactivity. This system is all about communicating essential danger information at a glance to guide safe handling and emergency response.

This helps explain why the other ideas don’t fit: NFPA 704 is not a measure of environmental pollution, not a quality grade for fertilizers, and not a tool for determining clinical trial dosages.