QUESTION

a) Workplace Exposure Limits such as TLVs or OELs are hygiene standards devised to set safe levels of hazardous substances to which workers could be exposed at work without adverse health effects. What are the limitations in their use?

b) What are the main differences between environmental and personal monitoring used in assessing hazards in the workplace?

c) Name the two main groups of asbestos fibres and give a known example in each type of these naturally occurring fibrous minerals

d) What are the four common physical parameters and two person factors used in the evaluation of the thermal comfort of employees working in a hot and humid environment?

e) Briefly describe the five components of a typical local exhaust ventilation system, one of the most effective engineering controls used by Industrial Hygienist