What Occupational Hygiene Does
The purpose of occupational hygiene, how it differs from safety and occupational health, and how the course fits together.
11 min
Activities: 0 of 3
The science of exposure
Occupational hygiene is the discipline of anticipating, recognising, evaluating and controlling health hazards at work. Its central question is simple: how much of this agent reaches this person, and is that acceptable? The answer needs both science and practical judgement. A hygienist must understand chemistry and physics, but must also understand how a job is really done on a night shift with an impatient supervisor.
The hygienist works between two other groups. Safety professionals deal mainly with sudden events. Occupational health professionals deal with the person: health surveillance, fitness for work, diagnosis. Occupational hygiene deals with the exposure — the link between the hazard and the person.
Three disciplines, one worker
Focus: events such as falls, fires and releases. Typical tools: permits, guarding, isolation, incident investigation.
Two examples of hygiene thinking
Example 1: the quiet process. A chemical plant has a fully enclosed reactor and a good safety record. A hygienist follows the material from delivery to waste and finds that the highest exposures happen when operators open filter housings to change cartridges once a week. The reactor is not the problem; the maintenance task is.
Example 2: the right question. A manager asks a hygienist to "test the air" in a workshop. The hygienist asks why. The real concern is whether a new cutting process increases dust exposure for two operators. That question leads to personal sampling during cutting, not a single static sample in the middle of the room.
Match the concern to the discipline that leads on it
- A worker falls from a platform
- Is solvent exposure during cleaning acceptable?
- Can this worker return to driving after an operation?
- Is the extraction capturing the welding fume?
A manager asks you to "test the air" in a workshop. What should you do first?