Which warning label classification signifies a moderately toxic substance?

The classification that signifies a moderately toxic substance is "Warning." In the context of hazard communication, labels on substances are categorized based on their toxicity levels to ensure safe handling and usage.

"Warning" indicates that the substance poses a moderate hazard, meaning it can cause adverse effects with moderate exposure or under certain conditions. This status informs users that while the substance is not the most hazardous available (which would typically be marked with "Danger"), it still requires careful handling to avoid possible health risks.

The other classifications serve different purposes: "Danger" denotes a high level of toxicity or severe hazards, "Caution" is generally reserved for substances that are considered less harmful than those labeled with “Warning,” and "Non-toxic" indicates that the substance does not pose any recognized health risks. Understanding these labels is essential for anyone in pest control or handling chemicals, as they guide necessary precautions and safety measures.