Abstract

Symposium Sessions

Day 2, June 11（Tue.）　9:55-10:15　Room A (Convention Hall 300)

Numerous indoor sources release volatile organic compounds (VOCs), whose concentrations typically surpass those found outdoors. Humans spend approximately 87% of their time indoors; thus, their exposure to indoor VOCs is considerable.1)2) Hence, analyzing the indoor air composition and localizing the emission sources is essential for both indoor and urban air quality. In this study, we investigated VOC concentrations in an office environment with varying occupancy and ventilation via real-time proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS) by evaluating conditions across varying scenarios. The PTR-MS data of indoor air demonstrated that more than 70% of VOCs were derived from occupants and the ventilation system significantly affected the indoor air quality. A decrease in the ventilation recirculation ratio reduced the total concentration of indoor VOCs by 76% owing to the introduction of fresh ambient air. Notably, daytime measurements with the half-open damper of the ventilation system accentuated the significance of controlled ventilation in mitigating VOC presence.

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