Air monitoring (2)

If the competent person determines that the exposure standard has been exceeded at any time in a work area, the person conducting the business or undertaking must, so far as is reasonably practicable —
(a) determine the workers and other persons who were in the work area during that time: and
(b) warn those workers about possible exposure to respirable asbestos fibres; and
(c) warn the other persons about possible exposure to respirable asbestos fibres.