美国联邦标准（FS209E）
USA federal standard(FS209E)
中国药品生产洁净室（区）的空气洁净标准
Air purify standard of Chinese medicine production purify
room(area)
空气洁净度登记通常按室内单位体积空气中含尘或含菌浓度来划。
世界主要国家都有自己的洁净度登记标准。
Air clean class generally is classified according to
the content of dust or bacteria of the air per cubic meter. The main countries
of the world have their own clean class standard.
Clean room and clean grade of particle suspending in the air within the clean area
