The National Institute for Occupational Safety and Health is a Federal agency that among its various responsibilities trains occupational health and safety professionals, conducts research on health and safety concerns, and tests and certifies respirators Found on http://www.chemicalglossary.net/definition/1197-NIOSH
NIOSH: The National Institute for Occupational Safety and Health, a US Federal agency responsible for conducting research and making recommendations for the prevention of work-related disease and injury. Despite its name (which would suggest that it is part of the National Institutes of Health (NIH), NIOSH is part of the Centers for Disease Control... Found on http://www.medterms.com/script/main/art.asp?articlekey=14929