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Organic pollutant gases can cause severe damage to both materials and people and have received much attention as a problem in the indoor environment. In this paper, 1-butyl-3-methylimidazolium chloride (C4mimCl) was em-ployed as sensing material coated on quartz crystal microbalance (QCM) for the detection of organic vapors. The ex-perimental results indicated that the C4mimCl/QCM sensor showed fast response, excellent sensitivity and good reproducibility towards organic acids. There was a good linear relationship between the frequency response and the testing concentration of these organic acid vapors. The results also indicated that C4mimCl/QCM sensor could be a good candidate for the real-time detection of organic acid vapors. [ABSTRACT FROM AUTHOR]