What numerical range is used within the blue, red, and yellow sections to represent hazard severity in the NFPA 704 system?

The numerical range used in the National Fire Protection Association (NFPA) 704 system for representing hazard severity is categorized into four levels with values ranging from 0 to 4. Each number corresponds to different levels of hazard severity, with 0 indicating no hazard and 4 indicating a severe hazard. This system is widely used to ensure that emergency responders can quickly understand the risks associated with a material, thereby facilitating safer handling and management of hazardous substances.

The choice that indicates a range of 0 to 4 aligns perfectly with how the NFPA classification system is structured, making it the correct answer. This system serves as a critical communication tool in emergency planning and response for hazardous materials.