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Determining ventilation rates is helpful to study indoor air quality (IAQ). This paper investigated the natural ventilation of three households in Beijing, using exhaled CO2 as the tracer gas to calculate and determine the ventilation rates. Also it considered ventilation conditions in different seasons, in different outdoor air quality, and in different outdoor temperatures. The results show that there are seasonal differences in window opening behavior, and outdoor temperature has a more significant effect on window opening behavior than that outdoor air quality. The data obtained in this study and its analysis is thought useful as a reference source for other studies of energy-saving ventilation systems. © 2020, Springer Nature Singapore Pte Ltd.
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