Basic Principles in Occupational Hygiene M200 (replaces W201 OHTA course)

This examination aims to test the broad principles of occupational hygiene as the basis for anticipation, recognition, evaluation and control of hazards that can be encountered in the workplace.

Who is it for?

This examination is for the following: 

  • Health and safety professionals 
  • Occupational health specialists including physicians and nurses 
  • People wanting to enter the field of occupational hygiene  
  • Specialists in subjects such as acoustics, ergonomics, human factors, occupational psychology, work organisation, biosafety, acoustics, engineering, or analytical chemistry who want a broader appreciation of how their role interfaces with other professions over health issues in the workplace 

How to prepare

Candidates can prepare by self-study, but are recommended to follow appropriate in-company training, University course or other course provided by a reputable training provider.

Learning objectives

On completing this examination successfully, students will have a basic understanding of: 

  • the value of occupational hygiene and the role of the occupational hygienist; 
  • the range of hazards (physical and chemical) in the workplace; 
  • hazard recognition techniques; 
  • sources and potential routes of exposure; 
  • hazard evaluation, exposure assessment and measurement processes; 
  • methods of controlling exposure; 
  • the management of occupational hygiene programmes. 


This is an open-book multiple choice examination comprising of 40 questions (40 marks) to be answered in 1 hour.

The examination covers all sections of the syllabus and is overseen by an invigilator. The pass mark for this examination is 60%.

M200 is recognised for the purpose of professional training and education by the Faculty of Occupational Hygiene, the Professional Standards Body for UK Occupational Hygiene, Chartered Professional Body and statutory body for the recognition in the UK of overseas professional qualifications in Industrial/Occupational Hygiene.

BOHS is no longer an authorised examining body for the OHTA W201 module or part of the OHTA international training scheme and qualifications framework.

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