This book aims to provide a basic understanding of the principles of occupational health and occupational hygiene, and to provide practical guidance on implementation of occupational hygiene solutions to occupational health problems. Topics covered in the book include: toxicology, epidemiology, and the concepts of hazard, dose and risk; the concept of the workplace exposure standard; control techniques for hazardous substances; the impact of dust, toxic metals, gases and vapours in the workplace and techniques for assessment and control; assessment and control of physical hazards, in particular, noise and vibration, non- ionising radiations, temperature extremes, and working at pressure; the significance of microbiological hazards, including general control programs for such hazards, and control techniques suitable for legionnaire's disease, AIDS, and humidifier fever.