ISO 28439:2011提供了使用迁移率粒度仪（也称为微分迁移率分析仪）测定超细气溶胶和纳米气溶胶的数量浓度和粒度分布的指南。只考虑气溶胶的颗粒部分。对于超细气溶胶和纳米气溶胶，暴露指标，如数量和表面积浓度非常重要。 ISO 28439:2011还提供了确定工作场所暴露于超细气溶胶和纳米气溶胶的指南。 具体来说，讨论了目前可从多家供应商处获得的差分迁移率分析系统（DMAS）。 包括操作原理、工作环境中的采样问题、校准、设备维护、测量不确定度和测量结果报告。 描述了潜在的问题和限制，在确定极限值并进行符合性测量时，需要解决这些问题和限制。

ISO 28439:2011 provides guidelines for the determination of the number concentration and size distribution of ultrafine aerosols and nanoaerosols by use of mobility particle sizers (also called differential mobility analysers). Only the particle fraction of the aerosol is considered. For ultrafine aerosols and nanoaerosols, exposure metrics such as the number and surface area concentration are important. ISO 28439:2011 also gives guidelines for the determination of workplace exposure to ultrafine aerosols and nanoaerosols. Specifically, the differential mobility analysing system (DMAS), now available from several vendors, is discussed. Principles of operation, problems of sampling in the workplace environment, calibration, equipment maintenance, measurement uncertainty, and reporting of measurement results are covered. Potential problems and limitations are described, which need to be addressed when limit values are fixed and compliance measurements carried out.