What protective measure should a firefighter take when encountering high levels of smoke?

When encountering high levels of smoke, donning a full-face mask is essential for protecting the firefighter’s airway and preventing inhalation of harmful particulates and toxic gases that may be present in the smoke. Smoke inhalation can lead to serious respiratory issues and other health complications, making it crucial for firefighters to maintain a supply of breathable air while operating in such hazardous environments.

A full-face mask not only covers the mouth and nose but also protects the eyes, which can also be affected by smoke and irritants. This protective gear is part of standard personal protective equipment (PPE) that ensures the safety and effectiveness of firefighters as they confront dangerous situations.

The other options, while they may have their own importance in specific scenarios, do not provide the direct respiratory protection required in smoky conditions. Closing doors may help contain a fire but does not protect from inhalation hazards. A heat-resistant blanket could be useful in certain situations, such as shielding from flames or heat, but it won’t provide protection from smoke inhalation. Activating emergency lights is a procedural action for visibility and safety on the scene but does not relate to personal protection against smoke.