What is required to effectively address dry dust in depot yards?

To effectively address dry dust in depot yards, sweeping is the most appropriate action. Sweeping is a common and efficient method for removing accumulated dust and debris from surfaces. This process not only helps maintain cleanliness but also reduces the risk of dust entering containers, which can be crucial for maintaining the quality of the cargo and the containers themselves.

Using a broom or mechanical sweeper allows for the collection of loose particles without the need for water, which may be impractical in certain situations or environments. Additionally, sweeping can also help prevent dust from becoming airborne, which can be a health hazard for workers in the vicinity, and can improve visibility within the depot yard.

In contrast, options like cold wash or hot wash typically involve using water and cleaning agents, which may not be necessary or effective for merely removing dry dust. These methods are more suited for cleaning greasy or heavily soiled areas rather than just addressing dust. Choosing no action would not contribute to maintaining the workplace environment, which could lead to further dust accumulation and associated issues.