There are so many hazardous chemical substances in indoor air, such as volatile organic compounds (VOC) from building materials, or nitrogen oxide, sulfur oxide from open combustion appliance. As the health damages caused by exposure of chemical substances have become very serious nowadays, study of the investigation into the cause and the palliation of symptoms are widely improving in medical science and building science. However, to solve this problem fundamentally, the comprehensive and quantitative assessments from generation of chemical substances to onset of symptoms are needed. In this study, the human exposure by formaldehyde, nitrogen oxide and sulfur oxide is analyzed at first. The second, the risk of diseases and the severe of disability are decided. At last, disability adjusted life year (DALY) by indoor air pollution is calculated. If it becomes possible to evaluate the health damage caused by indoor air pollution, the indoor air quality problem can be well solved, and also a number of environment issues can be assessed at the same time. The development of this system has a great meaning in practical environment design.
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