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The term immediately dangerous to life or health (IDLH) is defined by the US National Institute for Occupational Safety and Health (NIOSH) as exposure to airborne contaminants that is "likely to cause death or immediate or delayed permanent adverse health effects or prevent escape from such an environment." Examples include smoke or other ...
NIOSH was created by the Occupational Safety and Health Act of 1970 [27] and began operating in May 1971. [25] It was originally part of the Health Services and Mental Health Administration, and was transferred into what was then called the Center for Disease Control (CDC) in 1973. [27] NIOSH's initial headquarters were located in Rockville ...
Additionally, NIOSH keeps an index of chemical hazards based on their chemical name, [6] Chemical Abstracts Service Registry Number (CAS No.), [7] and RTECS Number. [8] Furthermore, OSHA has set permissible exposure limits [ 9 ] (PEL) on around 500 chemicals which are enforceable by law.
Toxic: a chemical that has a median lethal concentration (LC 50) in air of more than 200 parts per million (ppm) but not more than 2,000 parts per million by volume of gas or vapor, or more than 2 milligrams per liter but not more than 20 milligrams per liter of mist, fume or dust, when administered by continuous inhalation for 1 hour (or less if death occurs within 1 hour) to albino rats ...
For other requests, NIOSH visits the workplace to learn more about the health hazards present. In a small number of cases, NIOSH refers the request to a more appropriate agency. [3] On-site workplace evaluations are coordinated with the employer; NIOSH rarely makes unannounced visits. [3]
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A "white pages" telephone directory. A telephone directory, commonly called a telephone book, telephone address book, phonebook, or the white and yellow pages, is a listing of telephone subscribers in a geographical area or subscribers to services provided by the organization that publishes the directory.
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