建築物環境衛生検査に基づく首都圏X区における小中学校の温湿度•CO_2濃度に関する研究: エビデンスとして行政情報を用いた学校空気環境に関する研究 その2

摘要

平成19年〜平成22年における首都圏X区の建築物衛生法に基づく空気環境測定結果を用いて，特定建築物小•中学校のCO_2濃度，空気温度，相対湿度に関する考察を行った。その結果，以下の知見が得られた。1)在室人数20名以上の状態でのCO_2濃度中央値は小学校においては，夏期，中間期では1000ppmの建築物衛生法基準を満たしていたが，冬期は若干上回っていた。中学校では夏期，中間期，冬期のどの季節においても1000ppmを上回っていた。中学校では在室人数20名以上の状態でのCO_2濃度中央値は冬期が最も高く，次に夏期が高く，中間期が最も低かった。%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.