What color are placards for toxic substances?

The correct answer identifies that placards for toxic substances are colored green. In the context of hazardous materials, each type of substance is associated with a specific color that helps in quickly identifying the nature of the hazard. Green placards indicate toxic materials, signaling that the substance can pose serious health risks upon exposure or during accidental release.

Understanding these color codes is crucial for safety protocols, especially in transportation and handling of hazardous materials. Recognizing green placards in particular allows first responders and others to assess the level of risk and take appropriate actions to mitigate dangers related to toxic substances.