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１.职业接触限值（OccupationalExposure Limit,OEL）是职业性有害因素的接触限制量值，指劳动者在职业活动过程中长期反复接触对机体不引起急性或慢性有害健康影响的容许接触水平。化学因素的职业接触限值可分为最高容许浓度时间加权平均容许浓度、和短时间接触容许浓度三类。
1. Occupational Exposure Limit (OEL) is the exposure limit value of occupational harmful factors. It refers to the allowable exposure level of laborers who do not have any acute or chronic health effects on the body due to prolonged repeated exposure during occupational activities. Occupational exposure limits for chemical factors can be divided into the maximum allowable concentration time weighted average allowable concentration, and short-term exposure to allowable concentration of three categories.