Unit
- Occupational health: a multidisciplinary field concerned with promoting and maintaining the physical, mental, and social well-being of workers by preventing departures from health caused by working conditions, and by adapting work to the capabilities of the worker rather than the reverse.
- Occupational hygiene: the applied science dedicated to anticipating, recognizing, evaluating, and controlling environmental factors arising from the workplace that could impair worker health, comfort, or productivity, commonly summarized through the anticipation-recognition-evaluation-control cycle.
- Scope distinction: occupational health tends to focus on the worker as a biological and psychological subject, addressing medical surveillance and fitness for work, while occupational hygiene targets the environment itself, measuring and controlling the hazard at its source before it reaches the worker.
- Historical roots: the discipline traces to early industrial observations linking specific trades to disease patterns, such as chimney sweeps and skin cancer or miners and respiratory illness, which established the principle that occupation itself can be a determinant of disease.
- Multidisciplinary nature: practitioners draw from toxicology, epidemiology, engineering, ergonomics, psychology, and law, because no single discipline alone can address the full range of physical, chemical, biological, and psychosocial hazards present in modern workplaces.
- Prevention hierarchy: the field prioritizes primary prevention, eliminating or controlling hazards before exposure occurs, over secondary prevention through medical surveillance and tertiary prevention through treatment and rehabilitation of established disease.
- Economic rationale: beyond ethical obligation, organizations invest in occupational health and hygiene because unmanaged hazards generate direct costs such as compensation claims and indirect costs including absenteeism, reduced productivity, and reputational harm.
- Global relevance: occupational disease and injury burden falls disproportionately on manufacturing, mining, construction, agriculture, and healthcare sectors, though office-based and service industries increasingly report ergonomic and psychosocial concerns requiring the same systematic approach.
- Professional role: occupational hygienists and health practitioners serve as internal consultants who translate scientific measurement into practical risk management decisions communicated to engineers, managers, and workers alike.
Strategic Framework
Framework: Anticipation-Recognition-Evaluation-Control (AREC) Cycle
Purpose: Provides a structured, repeatable methodology for occupational hygienists to systematically address workplace hazards from design stage through ongoing control.
- Anticipation: Predicting hazards before a process, material, or facility is introduced, using design reviews and material safety data.
- Recognition: Identifying hazards already present through walkthrough surveys, worker interviews, and process mapping.
- Evaluation: Quantifying exposure levels through sampling, monitoring, and comparison against occupational exposure limits.
- Control: Implementing and verifying measures such as elimination, substitution, engineering controls, and administrative procedures to reduce exposure to acceptable levels.
Quick Revision
- Occupational health centers on the worker; occupational hygiene centers on the workplace environment.
- The discipline is multidisciplinary, combining toxicology, engineering, ergonomics, and epidemiology.
- The AREC cycle (anticipation, recognition, evaluation, control) structures hygiene practice.
- Primary prevention (eliminating hazards) is prioritized over secondary and tertiary prevention.