Exposure to volatile organic compounds (VOCs) detected in indoor environments may have negative impacts on childhood health. However, the associations between indoor VOCs and childhood asthma, considering daily behaviors, have rarely been conducted. Based on the case-control study with field measurement, we collected air samples from 358 children’s bedrooms. Concentrations of VOCs in air samples were measured by chemical treatment and gas chromatography-mass spectrometer. Logistic regression models were applied to investigate the associations between VOCs with childhood asthma. Meanwhile, stratification analysis was performed to reveal the influences of daily behaviors (window opening during night, using household chemical products, and bedroom cleaning) on the target associations. A new assessment indicator considering multiple VOCs was proposed to investigate the combined effects of multiple VOCs on childhood asthma. High concentrations of toluene (the highest adjusted odds ratio (AOR) was 2.59), o-xylene (AOR: 2.01), xylene (2.24), dodecane (the highest AOR was 2.57), pentadecane (2.82), hexadecane (2.04), α-pinene (1.99), total volatile organic compounds (TVOC) (the highest AOR was 2.94), and the new indicator of aromatics (the highest AOR was 2.59) were significantly associated with childhood asthma. The daily behaviors of the residents can significantly affect the target associations, with the window opening during night having the most significant effect, followed by bedroom cleaning and using household chemical products. Families with lifetime asthmatic children may have specific avoidance behaviors for the potential environmental factors on children’s health. These behaviors could explain that VOCs exposure had significant associations with the decreased odds of childhood asthma.
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