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Threshold limit value − time-weighted average (TLV-TWA): The average exposure on the basis of a 8 hours per day, 40 hours per week work schedule. Threshold limit value − short-term exposure limit (TLV-STEL): A 15-minute TWA exposure that should not be exceeded at any time during a workday, even if the 8-hour TWA is within the TLV-TWA.
Indicative limit value, set by the European Union; Threshold limit value, set by the American Conference of Governmental Industrial Hygienists; Occupational exposure banding, a process that can be used when not enough data are available to determine quantitative exposure limits
Threshold Limit Values (TLVs), often determined by the American Conference of Governmental Industrial Hygienists (ACGHI), is a key component in determining the PEL. [11] [10] Other things that contribute to determining the PEL are toxicity and particle size. [10] PELs for chemicals are measured in mg/M 3 (milligrams per cubic meter). [2]
STEL is a term used in exposure assessment, occupational health, industrial hygiene and toxicology. The STEL may be a legal limit in the United States for exposure of an employee to a chemical substance. The Occupational Safety and Health Administration (U.S. OSHA) has set OSHA-STELs for 1,3-butadiene, [1] benzene [2] and ethylene oxide. [3]
The Scientific Committee on Occupational Exposure Limit Values (SCOEL) is a committee of the European Commission established in 1995 to advise on occupational exposure limits for chemicals in the workplace within the framework of: Directive 98/24/EC, the chemical agents directive; and; Directive 90/394/EEC, the carcinogens at work directive.
Occupational hygiene; Recommended exposure limit – Limit for exposure to a chemical substance; Threshold limit value – Upper limit on the acceptable exposure concentration of a hazardous substance in the workplace; Hierarchy of hazard controls – System used in industry to eliminate or minimize exposure to hazards
National Institute for Occupational Safety and Health (NIOSH) RELs are designed to protect the health and well-being of workers by recommending safe exposure levels. To really use these guidelines well, safety professionals need to understand the recommended exposure levels, how to measure them, and ways to make sure workers aren't exposed to harmful stuff.
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 ...