The air quality in elementary/secondary schools located in metropolitan district X was analyzed by using results of the audit based on the management standard of environmental sanitation for buildings. The period of analysis was set as 4 years from 2007 to 2010. The following conclusions were obtained;
1) The average CO
2 concentrations under normally occupied condition in elementary schools during summer and midterm season met the standard of 1000 ppm, however did not meet in winter. The average CO
2 concentrations in secondary schools did not meet the standard during all seasons. 2) The percentage of rooms unsuitable for the CO
2 standards of 1000 ppm in secondary schools during winter was high at 58.3 %, and that in elementary schools was 45.5 %. 3) More significant tendency that the lower the outdoor temperature, the lower the window-opened ratio, was observed in the elementary schools than that in secondary schools. 4) Under the same outdoor temperature condition, the average ventilation rate in secondary schools was less than that in elementary schools especially during summer season. 5) The results of the audit might not be utilized as feedback information to improve the indoor air quality.
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