空气洁净度等级（air cleanliness class）：洁净空间单位体积空气中，以大于或等于被考虑粒径的粒子最大浓度限值进行划分的等级标准。用空态和静态方法进行测试。
... 风管系统的工作压力design working pressure 空气洁净度等级air cleanliness class 角件corner pieces ...
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第十九条不同空气洁净度等级的洁净室(区)之间的人员及物料出入，应有防止交叉污染的措施。
Article 19: Measures shall be taken to protect against cross contamination of personnel and materials entering or leaving clean rooms (areas) of different cleanliness class.
第五十二条工作服的选材、式样及穿戴方式应与生产操作和空气洁净度等级要求相适应，并不得混用。
Article 52: the material, style and way of wearing of protective garments shall be appropriate to the requirements of operation and cleanliness class and shall not be otherwise used.
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