What is the background color of a placard that signifies a poisonous substance hazard?

• A. Red
• B. Yellow
• C. White
• D. Black

Answer: (C)

The background color of a placard that signifies a poisonous substance hazard is white, which is specifically designated for identifying harmful or toxic materials. This color coding is part of a standardized system that helps responders and others quickly recognize the type of hazards they may encounter.

In the context of the United Nations’ system for classifying hazardous materials, white is used to denote poisonous substances, as it allows for a clear visual distinction from other types of hazards. Each color serves a specific purpose, creating a straightforward communication method that enhances safety during the handling or transportation of hazardous materials.