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Instrumentation Issue in Indoor Air Quality Measurements: The Case with Respirable Suspended Particulates

Two fundamentally different instruments are commonly used to measure the concentration of respirable sus pended particulates in the indoor environment, one is a gravimetric method, and the other is a light-scattering method. The two methods are specified as alternatives in the current indoor air quality certification scheme in Hong Kong. In this paper, we investigated the correlation between the two methods and subsequently recom mended that the gravimetric method should be used as the reference method and the light scattering method for preliminary screening measurements as this can signifi cantly reduce man-hours and also can provide diurnal concentration variation profiles. A similar correlation study should be conducted for instrumentation used for measuring other pollutants, especially regarding total volatile organic compounds.