Indoor air - Measurement of PM_2,5 mass concentration1 Scope This document specifies the measurement methods and strategies for determining the PM2,5mass concentrations of suspended particulate matter (PM) in indoor air. It can also be used for determining PM10mass concentration. The reference method principle consists of collecting PM2,5 on a filter after separation of the particles by an impaction head and weighing them by means of a balance. Measurement procedure and main requirements are similar to

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thorough examination (including testing)

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1 550 nm input and common port for output of combining 980/1 550 nm input light

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NOTE 2: This standard is the only guidance document on implementing ISO 45001 and replaces BS 18004