Health Effects of Hazardous Substances W507

This course aims to introduce you to the principles of toxicology, physiology and epidemiology. The course will cover the main types of harmful effects to target organs from exposure to chemical hazards at work, and the hazards associated with common hazardous substances. 

Who is it for?

This course is suitable for technicians and technologists who carry out measurements and testing in workplaces. 

How is it delivered?

This course runs typically as a five-day taught course [minimum 45 hours including lectures, tutorials, practical/demonstration sessions, guided reading, overnight questions and examination]

Learning objectives

On completing this course, you will be able to: 

  • Provide definitions of commonly used toxicological terms 
  • Describe the main routes by which hazardous substances can enter the body, and the factors which influence their absorption, distribution, storage and elimination 
  • Describe the main sources of information on hazardous substances and processes 
  • Describe the main features of the principal target organs affected by hazardous substances at work, and the factors which influence the degree of harm 
  • Describe the main routes of exposure and toxic health effects for hazardous substances commonly encountered in the workplace 
  • Carry out basic interpretation of the results from epidemiological studies 


There will be a 40 short answer question “open book” examination with an allowed time of 120 minutes. 

BOHS is the only awarding body for the W500 series occupational hygiene modules as part of the OHTA International Training Scheme and Qualifications Framework.


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