Which warning word indicates a substance is moderately toxic?

• A. Warning
• B. Caution
• C. Danger
• D. Hazard

Answer: (B)

The term "Caution" is used as a warning word to indicate that a substance has moderate toxicity. In the context of hazard communication, this word generally signifies that exposure to the chemical may pose a health risk, but it is less severe compared to substances categorized under "Danger."

In regulatory standards, the labeling of hazardous substances typically follows a hierarchy. "Caution" conveys that while there is a potential for harm, the risks associated with it are not as extreme as those labeled with "Danger," which suggests a high level of toxicity or danger. Conversely, "Warning" often signifies a level of caution that is between "Caution" and "Danger," although it is not specifically tied to moderate toxicity. "Hazard" does not function as a warning word but rather describes a condition that can cause harm or adverse effects, without the specificity of toxicity level.

Understanding these distinctions is essential for recognizing the potential risks associated with handling different substances, ensuring safety measures are appropriately applied.