职业接触限值(Occupational exposure limits,OELs)指劳动者在职业活动过程中长期反复接触,对绝大多数接触者的健康不引起有害作用的容许接触浓度[1]。我国历经初创、借鉴、摸索和实践4个阶段已逐渐形成了47类71项粉尘OELs[2]。OELs只是与检测值进行相互比较的一把尺子,理论上不应存在问题;但在实际工作中,却有不少职业卫生工作者在应 Occupational exposure limits (OELs) refer to the allowable exposure levels of workers who have long-term repeated exposure to occupational activities and have no harmful effect on the health of the overwhelming majority of contacts [1]. China has gradually formed 47 categories of 71 dust OELs after four stages of start-up, reference, exploration and practice [2]. OELs are only a yardstick for comparison with the test values, and there should not be any problems in theory. However, in actual work, there are many occupational health workers who should