Health & Safety

Decent Essays
Occupational Health and Safety


1. (15 marks) The TLV for carbon monoxide is 35ppm. Define the terms TLV and ppm and calculate them for the following example:


TVL = Term for airborne concentration of a substance, below which all workers are believed to be protected while exposed to it day after day for 8-hour periods.

PPM = Concentration by volume of one part of a gas, or by weight of a liquid or solid, per million parts of air or liquid.

A mechanic in an automotive repair shop is exposed to the following carbon monoxide levels over an 8 hour shift.

1. 2 hours @ 34 ppm

2. 5 hours @ 40 ppm

3. 1 hour @ 20 ppm

Is the worker over-exposed during the duration of the work-shift?
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- Have employees rotate half days exposed to the carbon monoxide and half days on non-exposure duties.

- Increase monitoring equipment in the facility.

3. Personal Protective Equipment:

- Should only be used in the event that engineering and/or administrative controls are not feasible or practical.

- Use of respiratory assist equipment during peak TVL periods.

2. Referring to question 1, how could you use the elements of the hazard control hierarchy to help clarify the concept of safety controls for an employee? How might an employee participate in ensuring their own safety? What other worker rights might you include in this type of orientation to health and safety training regarding psycho-social factors and emerging workplace stressors? (10 marks)


We could use the elements of the hazard control hierarchy to help clarify the concepts of safety controls for employees by reviewing the primary concepts of each of the controls and how they will related to their roles:

Engineering Controls – the modification of work processes, equipment, and materials in order to reduce exposure to hazards.

Administrative Controls – management involvement, training of employees, rotation of employees, environmental sampling, and medical surveillance to protect individuals.

Personal Protective Equipment – should only be used when there is no feasible or practical way to enclose a process, provide local
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