Which condition indicates that immediate action is required for a carbon monoxide alarm?

The presence of carbon monoxide levels at or above a risky threshold is the condition that indicates immediate action is required. Carbon monoxide (CO) is a colorless, odorless gas that can be extremely dangerous, potentially leading to poisoning, unconsciousness, or even death. CO alarms are designed to detect dangerous concentrations of this gas in the environment.

When the carbon monoxide levels reach or exceed a predefined threshold, the alarm serves as a critical warning. This is a clear indication that there is a significant risk to health and safety, necessitating immediate action—such as evacuating the premises and seeking fresh air, as well as contacting emergency services if necessary.

In contrast, a low battery warning indicates that the alarm may not function properly in the future, but it does not suggest an immediate health hazard. The presence of smoke involves fire alarms and may not specifically relate to carbon monoxide, while no response from the alarm could signify a malfunction but does not indicate any immediate danger from CO. Thus, recognizing and responding to high CO levels is essential for ensuring safety when it comes to carbon monoxide exposure.