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Time periods which are used for workplace exposure limits (WELs), with two periods of 8-hours (long-term exposure limits - LTELs) and 15-minutes (short-term exposure limits - STELs) being commonly used.

“Both the long-term and short-term exposure limits are expressed as airborne concentrations averaged over a specified period of time.”
(Source: EH40/2005 Workplace exposure limits, HSE, p.28, , accessed 16th November 2025)