The study for the indoor air pollution and the clearing method

本研究旨在调查室内空气污染状况，个人暴露水平和室内空气污染折旧，得到以下结果：(1)长春市室内空气中多核芳烃（PAHs）浓度比日本北九州市高几十倍。这个原因是由于使用煤燃料取暖和做饭。(2)测定了日本北九州市新建校舍中挥发性有机化合物（VOCs）和HCHO的浓度水平。在新校舍的房间中检测到5种挥发性有机化合物和HCHO。随着时间的推移，污染物浓度逐渐降低。HCHO浓度在夏季有增加的趋势。(3)测量了非封闭场所学生吸烟室的空气污染情况。与讲座和午餐时间相比，污染物浓度相对较高。(4)测定了亚洲两个国家NO_2和VOCs的个人暴露浓度。北九州市NO_2的个人暴露水平约为1 ppb，室内和室外空气中NO_2的暴露水平也在同一水平。尼泊尔的个人NO_2暴露水平低于北九州市，为室内空气暴露水平的一半。尼泊尔的苯浓度检测结果高于北九州市。(5)当使用臭氧型空气净化器时，对NO和恶臭化学物质的降解均有效果。在自然通风的情况下，当通风次数为每小时2.5次左右时，所有化学物质的浓度下降到室外空气的浓度水平。

This study was designed to investigate the condition of indoor air pollution, personal exposure level and depreciation of indoor air pollution, and the following results were btained.(1)Polynuclear aromatic hydrocarbons (PAHs) concentration in indoor air in Changchun City, China showed levels several tens of times higher than those of Kitakyushu City, Japan. This reason is due to the use of coal fuel for heating and cooking.(2)The concentration levels of volatile organic compounds (VOCs) and HCHO in a newly constructed school building located in Kitakyushu City, Japan were mesaured. Five VOCs and HCHO were detected in the room in the new school building. The pollutants concentration decreased with the passage of time. However, the HCHO concentrations have a tendency to increase in summertime.(3)The air pollution in the student smoking hail, xdiich is not a closed place, was measured. The concentrations of pollutants were of a relatively higher level than those during the lecture and lunch time.(4)The personal exposure concentrations of NO_2 and VOCs were determined in two Asian countries. The personal exposure levels of NO_2 in Kitakyushu City were about lOppb, and those in indoor and outdoor air were also the same level. The personal exposure levels of NO_2 in Nepal were lower than those in Kitakyushu City, and a half of those in indoor air. Benzene concentration in Nepal was detected and was of a higher level than that in Kitakyushu City.(5)When an air cleaner of Ozone type was used, the depreciation of NO and maldorous chemicals showed the effect. In the case of natural ventilation, the concentration of all chemicals decreased to the concentration level of outdoor air when the ventilation number has about 2.5 times per hour.