Which of the following is NOT a major marking system for identifying HAZMAT?

The identification of hazardous materials (HAZMAT) is critical for ensuring safety during handling and in emergency situations. The correct answer is the Materials Safety Data Sheet (MSDS) labels, as they are not primarily a marking system used for identifying hazardous materials in the same way as the others listed.

The NFPA 704 system is a widely recognized method that uses a color-coded numbering system in diamond shapes to indicate the degree of hazards associated with materials, focusing on health, flammability, reactivity, and specific hazards. DOT placards are designed for transportation and visually communicate the type of hazardous material being carried, ensuring that first responders and personnel are aware of potential dangers.

The Globally Harmonized System (GHS) offers a unified classification and labeling of chemicals, aligning safety information regarding hazards and safe handling. It incorporates a standardized set of symbols and statements to communicate risks across different countries and sectors.

In contrast, MSDS labels, now commonly referred to as Safety Data Sheets (SDS), provide detailed information about handling, storage, and emergency measures related to specific chemicals. While these documents are vital for safety and compliance, they do not serve as a visual marking system for HAZMAT identification in the field, distinguishing them from the other major