NFPA placards numbers rate hazard for which categories?

• A. Health, Flammability, and Reactivity
• B. Temperature, Pressure, and Humidity
• C. Mechanical integrity
• D. Explosive potential

Answer: (A)

NFPA placards convey hazard at a glance by using three main categories: health, flammability, and reactivity. Each of these is given a number from 0 to 4, where higher numbers mean greater hazard, so responders can quickly assess potential harm to people, fire spread risk, and chemical reactivity. The white section highlights special hazards, such as oxidizers or water-reactive materials. This system focuses on these three hazard dimensions and does not rate environmental factors like temperature, pressure, or humidity, nor does it assess mechanical integrity or separate explosive potential as its own category.