This book provides detailed information on various important topics to the occupational safety professionals dealing with industrial safety, health and hygiene, especially the students appearing for Postgraduate Diploma in Industrial Safety course (PDIS/ADIS course). The book covers all aspects of the syllabus of PDIS/ADIS course on occupational health and industrial hygiene. The book contains one of the compulsory subjects of the course ‘Occupational health, industrial hygiene, personal protective equipment’ including ergonomics and work physiology. The book describes the potential problems in the practice of occupational health and hygiene faced by those who are going to devote their professional lives to ensure safe and healthy work environments for the workers employed in different industries and occupations.