Division 4.3.1 Where harmful substances accumulate or may accumulate in the atmosphere, appropriate measures must be taken to ensure:

1. (a)

   their suppression at source; or

2. (b)

   their extraction at source or removal; or

3. (c)

   diliction accumulations of such substances,

in such a way that workers are not at risk.

The system must be capable of dispersing these harmful substances in such a way that workers are not at risk.