On a pesticide label, the signal word DANGER indicates which level of toxicity?

• A. Slightly toxic product
• B. Moderately toxic product
• C. Category 1 highly toxic product
• D. Highly toxic product

Answer: (C)

DANGER on a pesticide label signals the highest level of acute toxicity. It corresponds to Category 1 highly toxic products, meaning a small amount can cause serious illness or death from a one-time or short-term exposure. Because of this extreme risk, the label will require stringent precautions—such as wearing appropriate personal protective equipment, following strict handling and application procedures, and observing any required restricted-entry intervals before workers can re-enter treated areas. The skull-and-crossbones symbol paired with DANGER is a visual cue that this product demands serious care.

For contrast, a WARNING indicates moderately toxic products, and CAUTION signals slightly toxic products. The key idea is that DANGER points to the most dangerous category on the label, guiding users to take the most protective measures.