Occupational health hazards include chemical hazards, biohazards, psychosocial hazards and physical hazards experienced in the workplace. Chemical hazards are caused by exposure to chemicals in the workplace and can cause acute or long-term detrimental health effects and can also cause physical and/or health risks. Biohazards are biological substances that pose threats to the health of living organisms and includes toxins or viruses that are harmful to humans and animals. Psychosocial hazards are hazards in the workplace hat are related to the way work is designed, organized and managed, as well as the economic and social contexts of work. Physical hazards refer to any radiation, ergonomic hazards, heat and cold stress as well as noise hazards.