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High indoor air quality is crucial for the health of human beings. The purpose of this work is to analyze the synergistic effect of particulate matter 2.5 (PM 2.5 ) and carbon dioxide (CO 2 ) concentration on occupant satisfaction and work productivity. This study carried out a real-scale experiments in a meeting room with exposures of up to one hour. Indoor environment parameters, including air temperature, relative humidity, illuminance, and noise level, were controlled at a reasonable level. Twenty-nine young participants were participated in the experiments. Four mental tasks were conducted to quantitatively evaluate the work productivity of occupants and a questionnaire was used to access participants’ satisfaction. The Spearman correlation analysis and two-way analysis of variance were applied. It was found that the overall performance declined by 1% for every 10 μg/m 3  increase in PM 2.5  concentration. Moreover, for every 10% increase in dissatisfaction with air quality, productivity performance decreased by 1.1% or more. It should be noted that a high CO 2  concentration (800 ppm) has a stronger negative effect on occupant satisfaction towards air quality than PM 2.5  concentration in a non-ventilated room. In order to obtain optimal occupant satisfaction and work productivity, low concentrations of PM 2.5  (<50 μg/m 3 ) and CO 2  (<700 ppm) are recommended.

The Synergistic Effect of PM2.5 and CO2 Concentrations on Occupant Satisfaction and Work Productivity in a Meeting Room