What is one function of a carbon monoxide monitor in a home?

A carbon monoxide monitor is specifically designed to keep occupants safe by detecting the presence of carbon monoxide (CO) in the air. This dangerous gas is colorless, odorless, and tasteless, making it nearly impossible for individuals to detect its presence without a monitoring device. When CO levels rise to potentially harmful levels, the monitor sounds an alarm to alert occupants, allowing them to take immediate action to ensure their safety. This function is critical because exposure to carbon monoxide can lead to serious health issues or even death.

The other functions mentioned do not pertain to the role of a carbon monoxide monitor. Humidity detection, air pressure measurement, and energy efficiency assessment require different tools and devices tailored for those specific purposes, thus underscoring the unique and vital role of a carbon monoxide monitor in household safety.