609. Prevention or control of exposure to substances hazardous to health.

609.     Prevention or control of exposure to substances hazardous to health.

Every employer must ensure that the exposure of his employees1 to substances hazardous to health2 is either prevented or, where this is not reasonably practicable3, adequately4 controlled5. In complying with his duty of prevention under the above provision, substitution must by preference be undertaken, whereby the employer must avoid, so far as is reasonably practicable, the use of a substance hazardous to health at the workplace6 by replacing it with a substance or process which, under the conditions of its use, either eliminates or reduces the