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Based on the test results concerning indoor air pollutant level in a house which use a gas range in the kitchen, the conclusions are as follows. 1. The results from measuring indoor air pollution in a house indicate that fine particles of NO₂ are the most serious factor of air pollution. The density of polluted air when the fan is off is 1.5 times and 6.9 times higher than when it is on. It implies the strong necessity of ventilation. 2. Relating to NO₂ concentration and the occurrence amount of particles, the total amount is increased along with the raise of LPG/LNG spending’, on the other hand, the amount of particles per litter has decreased. This implies that it is more efficient to slowly increase the flux of fuels rather than keep a steady flux level for a long time. 3. After 20 minutes of buming the fuels with no fan for ventilation, indoor air around the gas range is contaminated over an average value of one hour frame in the standards of underground indoor air quality. 4. NO₂ and fine particles less than 0.5pm have positively significant correlations. However, the correlation among NO₂, CO and SO₂ is not clarified.
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