bag (Top Trading, Seoul, South Korea) samplingmethodswerecompared to determine which sampling method is effective. The odor from the test cooling bench was collected with the two sampling methods then the sample was focused into a cryotrap (50 ml/min for 10min) and analyzed by GC–O. The same procedure was repeated three times for reproducibility. Fig. 2 shows aluminum polyester bag (a) and its sampling method (b).