Associate Safety Professional Practice Exam

At what level does carbon dioxide inhalation typically result in loss of consciousness?

1. 5 percent

2. 7 percent

3. 9 percent

4. 11 percent

The correct answer is: 9 percent

The inhalation of carbon dioxide can lead to loss of consciousness at elevated concentrations in the air. Typically, exposure to carbon dioxide levels around 9 percent can lead to significant physiological effects, including hypoxia and sedation, which may result in loss of consciousness in individuals. At lower concentrations, such as 5 percent, the body may experience increased respiratory rates and some discomfort, but consciousness is generally maintained. At concentrations higher than 9 percent, the risk increases dramatically, leading to even more severe effects that can jeopardize life and health. Thus, 9 percent stands as a critical level where loss of consciousness typically occurs, underscoring the importance of monitoring and controlling carbon dioxide levels in any environment where exposure is possible.