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Workplace Exposure Limits = WEL


A measurement of the maximum amount of a hazardous substance to which anyone in a workplace can be exposed measured as a TWA time weighted average over an 8 hour period.

Additionally some substances have an STEL, a short term exposure lim...



Machinery must be so designed, constructed and/or equipped that risks due to gases, liquids, dust, vapours and other waste materials which it produces can be avoided.


Where a hazard exists, the machinery must be so equipped that the said substances can be  obtained...