ISO 16000-27:2014规定了一种方法，该方法给出了纤维等于或大于0.2 μ m的纤维结构的数值浓度指数表面沉降尘埃的直径及其特定物质组的分类（如温石棉、角闪石石棉、其他无机纤维）。它主要适用于室内区域，但也适用于某些室外情况。描述了一种使用胶带收集沉降粉尘的采样技术。该方法包括通过扫描电子显微镜评估收集的样品的分析方法。结果可以在单位面积的石棉结构中指定和/或分为四个不同的载荷等级。分析灵敏度取决于检查的面积，可以低至10个结构/cm2。就ISO 16000-27:2014而言，石棉或纤维结构被定义为含石棉或（其他无机/有机）纤维的颗粒，无论其直径如何。 所描述的取样方法的使用是有限的，这取决于表面的结构和类型（微小的粗糙度和曲率）以及灰尘层的厚度。如果灰尘层太厚，则可以通过其他方式对灰尘层进行采样，并最终作为粉末样品进行分析。 假设沉降的粉尘具有大部分小于1mm的粒径。

ISO 16000-27:2014 specifies a method giving an index for the numerical concentration of fibrous structures with fibres equal or greater than 0,2 μm in diameter in settled dust on surfaces and their classification into specific substance groups (e.g. chrysotile, amphibole asbestos, other inorganic fibres). It is primarily applicable to indoor areas, but it is also suitable for certain outdoor situations. A sampling technique for collection of settled dust using adhesive tape is described. The method incorporates an analytical method for evaluation of the collected samples by scanning electron microscopy. The result can be specified in asbestos structures per unit area and/or classified into four different loading classes. The analytical sensitivity depends on the area examined and can be as low as 10 structures/cm². For the purpose of ISO 16000-27:2014, an asbestos or fibrous structure is defined as an asbestos or (other inorganic/organic) fibre-containing particle regardless of its diameter. The use of the sampling method described is limited, depending on the structure and type of the surface (minor roughness and curvature) and the thickness of dust layer. If the dust layer is too thick, the dust layer can be sampled by other means and eventually analysed as powder sample. It is assumed that the settled dust has particle diameters mostly below 1 mm.