Conversion between fibres/millimetre (f/ml) in air and fibres/cubic metre (f/m3) in air June 3, 2016June 3, 2016 Claire Dickinson ( standard measurements used for asbestos fibre concentrations in air – CIRIA 733) [table id=3 /] Related posts: Asbestos, the “unexpected” risk when coring through ground floor slabs How long have we known about the dangers of asbestos? Mind the Gap between Asbestos in Soils Guidance and Training! CIRIA start new project: asbestos from soil site management aide