Hazardous Materials Awareness Army 74D Practice Test

Which color on the NFPA 704 diamond indicates the health hazard?

Red Blue White Yellow

Correct Answer:

Blue

Explanation:

Hazard communication at a glance uses the NFPA 704 diamond, which has four colored sections to show different hazard types. The blue section represents health hazard—the potential for injury or illness from exposure. The numbers inside that blue area range from 0 to 4 to indicate severity, with higher numbers meaning greater health risk. Red signals flammability, yellow indicates reactivity, and white covers special hazards or notes (such as oxidizers or water-reactive materials). So for health hazard, you refer to the blue area.

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