STEL (Short-Term Exposure Limit)
The term "Short-Term Exposure Limit" (STEL) is used in workplace safety to denote the maximum concentration level of a pollutant that a worker may be exposed to in a short period of time, usually 15 minutes. This is an average value that should not be exceeded and it is assumed that exposure takes place no more than four times per working day, with at least one hour between exposures.
For example, in the context of bulk sampling, an STEL could be relevant for dust or other airborne pollutants that could be released during the sampling process. When sampling bulk materials, it may be important to take appropriate control measures to ensure that the STELs are not exceeded, to protect the health and safety of workers. Such measures could include, for example, the use of personal protective equipment, dust extraction or other technical controls.
Specific STELs may vary depending on the type of contaminant and workplace safety standards in the specific region or industry. It is important to check with the relevant health and safety authorities or professionals about the applicable requirements and standards.