Estimation of uncertainty in tracer gas measurement of air change rates

Atsushi Iizuka, Yumiko Okuizumi, Yukio Yanagisawa

    Research output: Contribution to journalArticlepeer-review


    Simple and economical measurement of air change rates can be achieved with a passive-type tracer gas doser and sampler. However, this is made more complex by the fact many buildings are not a single fully mixed zone. This means many measurements are required to obtain information on ventilation conditions. In this study, we evaluated the uncertainty of tracer gas measurement of air change rate in n completely mixed zones. A single measurement with one tracer gas could be used to simply estimate the air change rate when n = 2. Accurate air change rates could not be obtained for n ≥ 2 due to a lack of information. However, the proposed method can be used to estimate an air change rate with an accuracy of <33%. Using this method, overestimation of air change rate can be avoided. The proposed estimation method will be useful in practical ventilation measurements.

    Original languageEnglish
    Pages (from-to)4238-4249
    Number of pages12
    JournalInternational journal of environmental research and public health
    Issue number12
    Publication statusPublished - 2010 Dec


    • Indoor air
    • Perfluorocarbon
    • Tracer gas
    • Ventilation

    ASJC Scopus subject areas

    • Pollution
    • Public Health, Environmental and Occupational Health
    • Health, Toxicology and Mutagenesis


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