What is the purpose of ventilating a location during a CO alarm?

The primary purpose of ventilating a location during a carbon monoxide (CO) alarm is to reduce CO levels in the environment. Carbon monoxide is a colorless, odorless gas that can be produced by incomplete combustion of fuels. When the gas accumulates in an indoor space, it can lead to serious health risks, including poisoning.

By ventilating the area, which involves introducing fresh air and allowing the contaminated air to escape, the concentration of CO can be decreased. This is crucial in ensuring the safety of occupants and preventing potential health effects. Proper ventilation also creates a safer environment for first responders who may need to enter the area to assess the situation or assist individuals affected by CO exposure.

In contrast, the other options do not directly address the specific dangers posed by carbon monoxide. Eliminating all occupants does not resolve the underlying issue of CO buildup, and while preparing for investigations or checking gas pressure may be relevant in some contexts, they are not the primary objectives of ventilation during a CO alarm scenario.