What system is often used to classify hazardous materials?

The NFPA labeling system is widely recognized for classifying hazardous materials. This system employs a color-coded numerical rating system where a diamond-shaped label indicates the severity and nature of hazards associated with a substance. The diamond features four quadrants: the blue section denotes health hazards, the red section indicates flammability, the yellow section represents reactivity, and the white section provides specific information related to the material's properties.

This classification allows first responders and emergency personnel to quickly assess the risks involved with a particular hazardous material, ensuring appropriate precautions and responses are taken during incidents. The clarity and efficiency of this system make it a crucial tool in hazardous material management.

The other options serve different purposes and are not primarily used for classifying hazardous materials. For example, the OSHA color coding system pertains to workplace safety and hazard identification but does not offer a comprehensive classification like the NFPA system. ISO 9001 is an international standard focused on quality management systems, while NIOSH primarily deals with respiratory protection and occupational safety, without directly classifying hazardous materials.