HSG 248 provides advice and guidance for analysts involved in licensed asbestos removal and the sampling of asbestos-containing materials. This guidance is aimed at a technical audience, e.g. asbestos analysts, asbestos consultants, occupational hygienists, safety officers etc. It will also be useful to asbestos removal contractors and supervisors, employers, building owners and people with responsibility for managing properties and estates. Appendix 1 contains details of the now current approved analytical method for evaluation of fibres in air.