求解答ISO要求的环境等级和WHO957报告描述的等级差异

眷念锁眉间

最近在看WHO的技术报告，关于957其中的一段话不是很明白，请各位蒲友共同探讨下。文中提到的A级区是基于ISO4.8中5.0μm的粒子制定 B级区是基于ISO5中所有粒子制定 C级区域动静分别基于ISO7和8制定。D级静态是基于ISO8 ；
For classifi cation purposes in grade A zones, a minimum sample volume
of 1 m3 should be taken per sample location. Referring to Table 1, for
grade A the airborne particle classifi cation is ISO 4.8 dictated by the
limit for particles ≥ 5.0 μm. For grade B (at rest) the airborne particle
classifi cation is ISO 5 for both particle sizes considered. For grade C (at
rest and in operation) the airborne particle classifi cation is ISO 7 and ISO
8, respectively. For grade D (at rest) the airborne particle classifi cation is
ISO 8. For classifi cation purposes ISO 14644-1 (2) methodology defi nes
both the minimum number of sample locations and the sample size based
on the class limit of the largest particle size considered and the method of
evaluation of the data collected. The sample volume should be determined
according to ISO 14644-1 (2) clause B.4.2.

Anneyu_zY5yM

xmm1518

6666666666

xmm1518

888888888888

小金库

谢谢分享。