Book excerpt: Principles of Occupational Health and Hygiene offers a comprehensive overview of occupational health risks and hazardous environments encountered in a range of industries and organisational settings. Leading industry professionals and educators explain how to identify key workplace hazards including chemical agents such as dusts, metals and gases; physical agents such as noise, radiation and extremes of heat and cold; and microbiological agents. They outline assessment procedures and processes for identifying exposure levels. They also explain how to evaluate risk and follow safety guidelines to control and manage these hazards effectively. Chapters are heavily illustrated with detailed case studies, diagrams, flowcharts and photos. Practical guidelines are provided for managing each hazard type. This third edition has been extensively revised and updated and reflects current research evidence and the Workplace Health and Safety legislation on workplace hazards. Principles of Occupational Health and Hygiene is an essential reference for Occupational Hygienists and anyone in an Occupational Health and Safety role.