What is a potential result of inadequate ventilation during APU operations?

Inadequate ventilation during Auxiliary Power Unit (APU) operations can lead to harmful exhaust build-up. The APU generates exhaust as it operates, which contains harmful gases such as carbon monoxide and unburned hydrocarbons. Without sufficient airflow to disperse these emissions, the gases can accumulate in the vicinity of the APU or enclosed areas. This not only creates a hazardous breathing environment but also poses safety risks, including potential fire hazards or equipment malfunctions. Ensuring proper ventilation is crucial to mitigate these risks and maintain a safe operational environment, emphasizing the importance of effective exhaust management during APU usage.