What do the numbers in hazmat danger levels signify?

The numbers in hazmat danger levels signify a range from 0 to 4, where higher numbers indicate more dangerous substances. This system is designed to provide first responders and emergency personnel with an immediate visual assessment of the potential hazards presented by various materials.

For instance, a chemical rated as a "4" would represent an extremely hazardous substance presenting a significant risk of harm, while a substance rated as "0" would be stable and pose little to no risk. The scale is vital for determining the appropriate response measures during hazardous materials incidents.

Understanding this rating system is crucial for safety in handling, transporting, and responding to incidents involving hazardous materials. The other options do not accurately reflect the accepted standards used for hazmat classification, which could lead to misinterpretation of a material's risk level.