In the improvement of the air quality of indoors, it is necessary to determine the kind and the concentration of the chemical substances that emit from building products and production parts. In this paper, the investigation of the following three items was executed. 1. The background concentration and the background substances of three kinds of bags (PVF, FEP, ALF) were evaluated. 2. A standard solution was dropped to the bag and the collection rate of each VOC substances was measured. 3. The calculation of the Emission rate was tried by measuring VOC emitted from permeate tube using the Bag method. In these experiments we found that the background concentration of FEP was the lowest in three kinds of bags. It was confirmed that collection rate of DEHP was low. But Some VOCs such as toluene was a high collection rate. Moreover, emission rate from the bag method is steady from stirring it when sampling it.
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