Measured airborne fibre concentrations from work with asbestos cement.
At this time, the Health & Safety Executive (HSE) control limit is 0.1 asbestos fibres per millilitre of air (0.1 f/ml) or 0.1 asbestos fibres per cubic centimetre (0.1f/cm3).
The control limit is not a ‘safe‘ level and work activities involving asbestos should be designed to be as far below the control limit as possible. HSE has progressively tightened the control limit since 1987.
See page 2