Asbestos Dust
Asbestos Dust : For the purposes of the regulations, means: Chrysotile: (a) An average concentration over any 4-hour period of 1 fibre per millilitre of air; and (b) An average concentration over any 10-minute period of 6 fibres per millilitre of air. Amosite, crocidolite, fibrous actinolite, fibrous anthophyllite, fibrous tremolite: (a) An average concentration over any 4-hour period of 0.1 fibres per millilitre of air; and (b) An average concentration over any 10-minute period of 0.6 fibres per millilitre of air
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