S.L. 424.23 ст. 7Measurement and sampling.

(1) Depending on the results of the initial risk assessment, and in order to ensure compliance with the limit value laid down in regulation 8, measurement of asbestos fibres in the air at the workplace shall be carried out regularly.

(2) Sampling must be representative of the personal exposure of the worker to dust arising from asbestos or materials containing asbestos.

(3) Sampling shall be carried out after consultation of the workers and, or their representatives in undertakings.

(4) Sampling shall be carried out by suitably qualified personnel. The samples taken shall be subsequently analysed, in accordance with subregulation (6), in laboratories equipped for fibre counting.

(5) The duration of sampling must be such that representative exposure can be established for an eight-hour reference period (one shift) by means of measurements or time-weighted calculations.

(6) Fibre counting shall be carried out wherever possible by PCM (phase-contrast microscope) in accordance with the most recent, widely accepted recommendations applicable at the time. For the purpose of measuring asbestos in the air, as referred to in the first subparagraph, only fibres with a length of more than five micrometres, a breadth of less than three micrometres and a length/ breadth ratio greater than 3:1 shall be taken into consideration.