Which of the following is not an operation that is particularly hazardous to health under the Occupational Safety and Health Law?

The operation that is not considered particularly hazardous to health under the Occupational Safety and Health Law is stacker operation. This assessment is based on the standard classifications of workplace hazards.

Forklift operation, manual handling, and heavy lifting are all recognized for their potential risks, such as musculoskeletal injuries, strains, and accidents that could lead to serious injuries. They require specific training and adherence to safety practices to minimize health risks. In contrast, stacker operations generally involve equipment designed to reduce manual labor and the associated risks; they are often seen as safer due to the automation and the engineering controls that are typically in place.

Thus, while stackers can be involved in hazardous situations, the nature of their operation is generally less hazardous compared to the direct physical demands posed by the other activities listed. This distinction aligns with regulatory perspectives on what constitutes high-risk operations in terms of health hazards in the workplace.