 Exposure level :
mean concentration of fibres for a working day during which the exposure occurs. This value differs from the 8 hours weighted time average value in that it does not take into account the working days on which no exposure occurs : 0 : no exposure ; 1 : 0 < exposure level < 0.1 f/ml (low) ; 2 : 0.1 < exposure level < 1 f/ml (moderate) ; 3 : 1 < exposure level < 10 f/ml (high) ; 4 : exposure level > 10 f/ml (very high).
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