What are the two types of local alert in the event of a chemical or biological attack?

The correct answer identifies that the two types of local alert in the event of a chemical or biological attack are visual and percussion.

Visual alerts refer to signals like flashing lights or other visual cues that indicate an immediate threat. These are crucial in situations where audible noises might be drowned out by the chaos or disruption of an attack. Users can quickly spot these cues, allowing for prompt action without relying solely on sound.

Percussion as a type of alert typically encompasses loud sounds, such as sirens or loud alarms, which can alert personnel in a given area to the danger. This type of alert becomes particularly important when there may not be any visual confirmation of a threat or when the situation requires immediate action regardless of visibility.

The combination of both visual and percussion alerts ensures that individuals in a potentially hazardous area receive comprehensive warning information, allowing them to react promptly to protect themselves properly.