DETERMINATION OF INDOOR AIR-POLLUTION OF SEOUL BY NITROGEN-DIOXIDE USING A PALMES TUBE AIR SAMPLER

To determine the nitrogen dioxide level in indoor air as one of the ma ny harmful atmospheric pollutants, a total 200 sampling locations in S eoul and its suburbs were selected. A Palmes tube based upon Fick's Is t law of passive diffusion was used for gaseous nitrogen dioxide absor ption. Atmospheric nitrogen dioxide diffuses through the tube and form s a stable complex with triethanolamine coated on a stainless steel sc reen in the tube. This complex was spectroscopically analyzed by addin g a coloring reagent. The average nitrogen dioxide level obtained from 200 sampling locations in Seoul and its suburban areas investigated o ver 3 seasons, was 60.22 ppb with the range of 43-79 ppb. The nitrogen dioxide level tended to accumulate in the winter. The relationship be tween nitrogen dioxide in the level and the type of business or fuel, differences in the amount of fuel consumed and facility of ventilation are discussed.