Short Term Exposure Limit (STEL) 01
Short Term Exposure Limit (STEL) 01 : (a) According to American Conference of Governmental Hygienists, this is the time weighted average (TWA) airborne concentration to which workers may be exposed for periods up to 15 minutes, with no more than 4 such excursions per day and at least 60 minutes between them. [Duffus, 2000: Univ. Edinburgh Med School On-line Chemical Safety Glossary]; (b) The maximum permissible concentration of a material, generally expressed in ppm in air, for a defined short period of time (typically 5 minutes). These values, which may differ from country to country, are often backed up by regulation and therefore may be legally enforceable. [Oxford University, 2000 - Chemical Safety Information Glossary] ; (c) Represented as STEL or TLVSTEL, this is the maximum concentration to which workers can be exposed for a short period of time (15 minutes) for only four times throughout the day with at least one hour between exposures. Also the daily TLVTWA must not be exceeded. [University of Kentucky, 1999: Glossary of Safety Terms] [See also: Time Weighted Average]
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