Formalin contain building materials, formaldehyde is not emitted from dougals pine plywood, low formaldehyde plywood F1, particle board, glass wool and gypsum board. THe relation between concentration of formaldehyde emitted fro mbuilding materials and the surfce temperature are made clear by experimental measurements. Formaldehyde is a high concentration due to the temperature rise. Indoor air QUality of ocnventional houses an one constructed iwth none formalin materials are ocmpared regarding air tight. Formaldehyde decrease by ventilation from the opened windows, but air pollution is not completely removed by ventilation from the opened windows, but air pollution is not completely removed byventilation from the opened windows fo only 1 day. High aritight and difficulty ventilation space are high concentratio. Formalehyde is not emitted by choice of building materials sold on the market, which are used to built in houses to prevnet air pollution. One of the methods of decreasing the concentration of formaledhyde are expected by the absorptive perfomrance of charcoal, activated carbon and silica gel. Charcoal, activated carbon and silica gel reduce the concentration of formaldehyde.
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