Which statement is true regarding carbon monoxide and its dangers in structure fires?

The statement that carbon monoxide is often the cause of death for firefighters who run out of air is accurate and highlights a critical aspect of firefighting safety. Carbon monoxide is a colorless, odorless gas produced by the incomplete combustion of carbon-containing materials, which makes it a common and extremely hazardous byproduct in structure fires.

When firefighters are in environments with elevated levels of carbon monoxide, the risk of exposure increases significantly, particularly if they exhaust their air supply. Running out of air can lead to inhaling toxic gases, including carbon monoxide, which can rapidly impair the body's ability to transport oxygen. This gas binds to hemoglobin in the blood more effectively than oxygen, leading to carbon monoxide poisoning, which can be fatal.

Understanding this danger reinforces the importance of maintaining adequate air supply and monitoring exposure to carbon monoxide during firefighting operations. It emphasizes the need for proper training, the use of personal protective equipment, and adherence to safety protocols designed to prevent such deadly exposures in hazardous environments like structure fires.