Short term exposure level (STEL) refers to acceptable exposure to a chemical substance over a fifteen minute period. It is important that this time weighted average is not exceeded. The exposure level is expressed in parts per million (PPM) or in milligrams per cubic meter (mg/m3).
Short term exposure levels are used in the occupational health, industrial hygiene and toxicology industries. In the United States, the STEL is set as a legal limit. A STEL is a concentration of a substance that a worker can be exposed to without suffering from irritation, chronic tissue damage or narcosis sufficient to impair health.
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