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  Occupational Exposure Standard advert image shown if present

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A term that was previously used to for the upper limit of a substance hazardous to health and which must not have been exceeded. The standard was approved, along with a specified time, by the Health and Safety Commission. This term was removed from use by the Control of Substances Hazardous to Health (Amendment) Regulations 2004 and replaced (by Section 2(a)(iv)) with workplace exposure limit (WEL).