Under what conditions must the APP address heat stress?

The APP, or Activity and Project Plan, must address heat stress specifically when work occurs in confined environments with minimal air movement because these conditions significantly increase the risk of heat-related illnesses. When workers are in tight spaces where air circulation is limited, the body struggles to cool itself effectively, leading to a greater likelihood of heat stress and heat-related injuries.

In confined spaces, factors such as high temperatures, humidity, and physical exertion combine to create an environment in which the body can overheat more easily. Therefore, it's crucial that the APP includes protocols for monitoring and managing heat stress, such as ensuring adequate hydration, scheduling rest breaks, and implementing measures to improve airflow.

The other options, while related to heat stress awareness, do not specifically highlight the critical conditions that necessitate addressing this issue in the APP as directly as the confined spaces do. Understanding the unique risks associated with confined environments is essential for maintaining the health and safety of workers in those settings.