ABP UK | P: P403
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Air Sampling and Fibre Counting


This course is designed to provide students with theoretical and practical knowledge for air sampling and fibre counting and covers the BOHS P403 syllabus. Students are taught how to analyse air samples and report the results correctly and will need to pass both a written theory and a practical exam to obtain this qualification. The course duration is two days including theory, practical work and the exams.

Candidates are expected to be aware of the contents of HSG 248 Asbestos: The Analysts Guide, and in particular Appendix 1 ‘Fibres in air: sampling and evaluation of by phase contrast microscopy’. Candidates will preferably have prior experience of analysing fibre count samples and may already be participating in a quality control scheme.

ABP Associates Ltd are registered with IATP and BOHS. This P403 course has been awarded the BOHS’ “Gold Standard”. Our certificate is displayed proudly in our purpose-built teaching laboratory.

Course Dates

This course fills up quickly, we advise you to book your place early to avoid disappointment. To take a look at Course Dates and to Book, click here.

Delegates will be required to provide their own counting kit and microscope. These can be hired from ABP Associates by prior arrangement. Please email us to discuss your requirements.


Topics Covered


  • Setting up of a microscope
  • Procedure for taking air samples
  • Filter preparation
  • Fibre counting rules
  • Calculation of results
  • Quality control
  • Practical work

This P403 course goes hand-in-hand with the P404 course on air sampling and clearance testing. The two courses are usually held side-by-side.

In 2017, 100% of our P403 candidates passed their theory and formative practical exams with ABP Associates Ltd.