This additional requirement applies only, when this substance is carried in bulk or without packaging:

Spaces such as holds, accommodation and engine rooms, adjacent to holds containing these substances shall be ventilated.

After unloading, holds having contained these substances shall undergo forced ventilation.

After ventilation, the concentration of flammable or toxic gases and vapours given off by the cargo in these holds shall be measured.

The results of the measurement shall be recorded in writing.