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This International Standard specifies a method, using a fibre count technique, for the assessment of fibre concentrations in flowing gas streams in ducts, chimneys or flues from industrial processes using asbestos. This method may be used to determine fibre concentrations from a wide range of processes where it is known that "regulated" fibres are present in emissions. No attempt is made to identify asbestos fibre types separately from other fibres. NOTES 1 If fibre identification is required, reference should be made to ISO 10312. 2 This method may be used to check that dust collection equipment. used to trap or prevent asbestos fibres escaping into the atmosphere, is working properly and effectively. 3 This International Standard may be used to measure fibre concentrations as described in European Community Council Directive No. 87/217/EEC on the prevention and reduction of environmental pollution by asbestos. The range of application of the method for concentrations of fibres in ducts is about 0,05 fibres/cm3 to 10 fibres/cm3 , although this range may vary according to the sampled volume which in turn will depend on duct velocities and the sampling apparatus used.