Which statement is true regarding warning agents in fumigant formulations?

The correct statement regarding warning agents in fumigant formulations is that they are required in formulations that have no strong odors. This means that in situations where a fumigant lacks a distinct or strong odor, the inclusion of a warning agent becomes crucial to alert people to the presence of potentially hazardous chemicals. Warning agents provide an extra layer of safety by enabling individuals to detect the fumigant before they are exposed to dangerous concentrations, thus preventing accidental inhalation or other health risks.

When a fumigant has a strong or distinct odor, the natural scent serves as a warning to those nearby, which may make the addition of a warning agent unnecessary. As such, having a strong odor can fulfill the same safety function that the warning agent would provide. Therefore, the requirement for a warning agent is specifically tied to the absence of a strong odor in the fumigant formulation, ensuring safety in environments where the scent alone may not be sufficient to indicate danger.