What is the placement guideline for detectors in homes?

• A. CO detectors outside sleeping areas and on each level.
• B. Smoke detectors on every level and outside sleeping areas; CO detectors outside sleeping areas and on each level.
• C. Smoke detectors on every level and outside sleeping areas; CO detectors inside sleeping areas.
• D. Smoke detectors on every level and outside sleeping areas; CO detectors inside sleeping areas and on each level.

Answer: (D)

The idea is to place detectors where they will wake people quickly and catch hazards early, especially around where people sleep and on every level of the home. Smoke detectors should be on every level and outside sleeping areas so smoke traveling through hallways and living spaces is detected promptly, helping occupants wake and evacuate. CO detectors should be inside sleeping areas and on each level so if CO accumulates while people are asleep, the alarm is audible where they are most likely to be—inside the rooms they occupy and across the home to ensure detection anywhere CO could build up. This combination gives the best balance: smoke alarms provide broad level coverage, while CO alarms prioritize sleeping areas to maximize waking alerts and overall safety.