This study aimed to assess the pollution level in 13 crowded subway stations in an effort to understand the spatial and seasonal factors of Indoor Air Quality. The main measured items were particulate pollutants such as PM10 and PM2.5 and gaseous pollutants such as CO2, HCHO, Rn, TVOC, BTEX, and Styrene at concourses and platforms in the summer and winter periods. The influence of the draught created by the movement of the train was classified into lateral and island platforms, and the concentrations of PM by location (entrance, middle, and end) were statistically compared and analyzed. As a result, the concentrations of PM were confirmed high in the order of Platform > Concourse > Ambient air. In particular, in the case of platform PM10, the frequency exceeding the standard value (100 μg/m3) was 38.5% and the maximum concentration was 196.2 μg/m3. All gaseous pollutants were at lower levels than the standard, and the factors affecting CO2 and Rn were identified as the number of users and geological characteristics, respectively. The principal component analysis (PCA) demonstrated that PM was found to be a major indicator of the air quality management of subway stations. In particular, the concentrations at entrance and end areas in the lateral platform were about 1.4 times higher with regard to PM10 than in the middle area, and about 1.9 times higher with regard to PM2.5 due to the effect created by the draught produced by the movement of the train. Therefore, in order to manage PM in the platform area, a specialized management plan for places with particularly high PM concentration within the platform area is required. In addition, it is necessary to evaluate the effect created by the draught produced by train movement when selecting locations for measuring indoor air quality.

This study was conducted to evaluate the quality of indoor air and health-related parameters (allergic rhinoconjunctivitis) of subject of study (control group and sensitive group) in two schools. The schools were categorized into two groups of newly-built school and the school older than 5 years. Removal of indoor pollutant was investigated according to volume rates (0%, 1.5%, 3%) of indoor plants inside 3 classrooms respectively. The chemicals of indoor environmental research were PM10, Volatile organic compounds (toluene and benzene), formaldehyde, temperature and humidity. ARIA (Allergic rhinitis impacts on Asthma) test was used to assess health effect for 151 students. Also, The variation of SBS symptoms for students in classroom was measured by intervention. With increasing volume ratio of classrooms, there were positive and significant results between the indoor pollutant and student's health score. Students showed improvement health score during the period of putting indoor plants, which was facilitated by the placement of indoor plants at newly-built school classroom of indoor plants volume ratio 3%. From the results above, it could be tentatively effective newly-built school classroom of indoor plants volume ratio 3% improve indoor air quality and student's health score.

The aim of this study is to analyze the distribution of particulate matters including PM_2.5 which is known for severe adverse health effect than PM₁₀ in public facilities. The total 40 public buildings are investigated in this study and they are classified into 11 sub-groups as follows : child-care centers, medical centers, libraries, museums, bus terminals, ports, airports, railway terminals, subway stations, large-scale stores, and indoor parking lots. The mean concentration of PM₁₀ was 38.6㎍/㎥ and that of PM₁₀ in all studied facilities were lower than the Ministry of Environment's control standards. The average concentration of PM_2.5 was 27.2㎍/㎥ and that of PM_2.5 in 18 facilities were exceed the guideline of WHO (24h average value : 25㎍/㎥). The subway stations had the highest indoor level of particulate matters and the waiting area in bus terminals, railway terminals, indoor parking lots had followed in order. When comparing mean value of I/O ratio of PM₁₀, the only I/O ratio of subway stations were greater than one. In the case of PM_2.5, however, the average concentrations of PM_2.5 in indoors of subway stations, bus terminals, and indoor parking lots were higher than those of PM_2.5 in outdoors. The mean concentration of PM₁₀ and PM_2.5 were gradually increased between 6 A.M and 10 A.M and after 6 P.M in most of target buildings with increasing the number of users in thest facilities.

This study conducted comparison and data analysis of evaluation results from three kinds of monitoring methods for indoor air quality monitoring, which are Korean Official test method for indoor air quality, monitoring method by gas analyzer, and continuous measurement by using sensor. NO₂, one of indoor air pollutants, was selected as a evaluation factor for this study because it is commonly generated during the operation of potable gas range. Monitoring results of NO₂ concentration from three subjected methods show that background concentration of NO₂, before operation of portable gas range, was 43.05~50.22ppb. On the other hand, NO₂ concentration for four and half hours (4½) after gas range operation was 64.31~69.89ppb in average. Average concentration of NO₂ during first thirty (30) minutes was increased about 33.85~49.39% than the concentration of NO₂ before operation of gas range. </br>In general, monitoring results by utilizing NO₂ gas analyzer was 8.1% higher than the results by continuous measurement using sensor method. In case of monitoring method using sensor, the results was lower about 6.1% than Korean official test method, and lower about 11.7~3.2% than NO₂ gas analyzer. Especially, change rate of concentration for first thirty (30) minutes measured by Korean official test method was 50ppb/hr, which is 44.4% lower than the change rate from NO₂ gas analyzer, 90ppb/hr, and 43.2% lower than results from sensor, 88ppb/hr. </br>In accordance with this study, it is concluded that monitoring frequency for indoor air quality management must be shorten during the time period having significant change rate of NO₂ concentration. In other words, air quality monitoring must be considered characteristics of concentration changes as well as accuracy of measurement.

The purpose of this study are to examin the level of temperature, relative humidity and pollutants at stock rooms in National Archives and to provide fundamental data in order to protect damage of archives. The survey of indoor air quality(IAQ) in stock rooms was performed in Busan National Archives in August and December 2007, and collected basic data, on level of them at stock rooms in National Archives that were published. The temperature and relative humidity in stock rooms were within the terms of national law of the public archives administration. The concentration of PM10 in stock rooms in National Archives exceeded 50 ㎍/m³, which is the guideline of national law for the public archives administration. The concentration of CO, SO₂, NO₂, O₃ and Formaldehyde in stock rooms did not exceeded the guideline of national law. The concentration of total volatile organic compounds was shown to exceed the guideline of natioanl law. Therefore, we suggest that a national plan for the management of IAQ at stock rooms in National Archives should be established through a long-term, continuous investigation

Recently, indoor air quality (IAQ) in workplace, residence, and schools has been one of the major concerns of people, scientists and the related public. This study was performed to investigate the characteristics of indoor air quality(IAQ) in kindergartens, elementary school, middle schools, and high schools from June 2004 to May 2005 in Korea. We measured indoor air pollutants such as PM10, CO2, formaldehyde, total bacteria colony(TBC), CO, radon, total volatile organic compounds(TVOCs), asbestos, and O3 from school classrooms. The subjects were classified by building year based on the time span of 1, 1 - 3, 3 - 5, and 5 - 10 years. The levels of pollutants and physical factor in schools were compared with standards and guidelines of indoor air quality on the Ministry of Environment, the Ministry of Health and Welfare, and the Ministry of Education, and Human Resources Development of Korea. The major results obtained from this study can be summarized as follows. Asbestos and O3 were not detected in all surveyed classrooms. However, we were able to detect CO, TBC, TVOCs, and formaldehyde in kindergartens, TBC in elementary schools, TBC, TVOCs and formaldehyde in middle schools, and formaldehyde in high schools. This study was conducted to provide a basis for the management IAQ in school. Therefore, we suggest that a national plan for the management of IAQ in school should be established through a long-term, continuous investigation for the proper assessment of IAQ in school and for the health risk assessment for student.