The term 'OOHS' is a four-letter acronym for the phrase 'Occupational and Environmental Health Services'. This term is used to refer to the services provided by organizations that specialize in protecting workers from hazardous conditions in the workplace. These services include identifying, evaluating, and controlling potential health hazards, as well as providing medical surveillance and training programs. Additionally, OOHS organizations may provide research and consultation services to help employers create safe and healthy work environments.