Question

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the osha permissible exposure limit is 15 mg/m3 total dust and 5 mg/m3 respirable fraction. under normal conditions none is normally required. in the event that the permissible exposure limit is exceeded and engineering controls are not feasible, a half facepiece particulate respirator(niosh type n95 or better filters)may be woen for up to ten times the exposure limit or the maximum use concentretion specified by the appropriate regulatory agency or respirator supplier, whichever is lowest. If oil particles(e.g lubricants, cutting fluids, glycerine, etc)are present, use a NIOSH type R or P filter for emergencies or instances where the exposure levels are not know, use a full-facepiece positive- pressure, air- supplied respirators do not protect workers in oxygen-deficient atmospheres.
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Answer 1

职业安全与卫生管理局允许暴露的限制是15毫克/立方米总粉尘和5毫克/立方米呼吸性fraction.通常是在正常情况下required.没有在该事件,其允许暴露限制是超越和工程控制工程控制工程控制工程是不可能的,半口罩微粒口罩”(niosh式n95或者更好的过滤器)可能是woen 10次曝光限额或最大程度地利用concentretion指定由适当的法定机构或呼吸面罩供应商,无论哪个是最低的。如果石油粒子(例如润滑油、切削液、甘油等)都在场,使用一个管理局的R或P滤波算法,并将其类型紧急情况或者例证暴露水平不知道,使用一个full-facepiece正向-压力、气-提供口罩不保护工人在缺氧氛围。

来自有道。

Answer 2