Heudorf U, Neitzert V, Spark J
Public Health Service of the City of Frankfurt/M., Braubachstr. 18-22, D-60311 Frankfurt, Germany.
Int J Hyg Environ Health. 2009 Jan;212(1):45-55. doi: 10.1016/j.ijheh.2007.09.011. Epub 2007 Dec 26.
The objective of the study was to measure the indoor air quality in classrooms with special emphasis on particulate matter (PM 10) and carbon dioxide (CO(2)) and the impact of cleaning and ventilation.
PM 10 was analysed via gravimetric method and by laser beam technology. CO(2) was analysed by infrared sensors. Measurements were collected for 3 weeks; first week: "normal" cleaning (twice a week) and ventilation; second week: intensified cleaning (five times a week); third week: intensified cleaning and intensified ventilation.
Levels of PM 10 in the classrooms during the 3 weeks were 69+/-19microg/m(3) and they were dominated by occupancy and the persons' activity. Intensified cleaning showed a significant decrease in all classrooms (79+/-22 to 64+/-15microg/m(3)). The effect of ventilation on levels of PM10 was inconsistent - levels of CO(2) were very high in all schools and could be diminished by intensified ventilation (mean 1459 to 1051ppm).
Although further investigation is needed to study detailed characteristics of the PM 10 (size distribution, chemical identity) the data are sufficient to improve the cleaning and the ventilation in schools.
本研究的目的是测量教室的室内空气质量，特别关注颗粒物（PM 10）和二氧化碳（CO₂）以及清洁和通风的影响。
通过重量法和激光束技术分析PM 10。通过红外传感器分析CO₂。测量工作持续了3周；第一周：“正常”清洁（每周两次）和通风；第二周：强化清洁（每周五次）；第三周：强化清洁和强化通风。
3周内教室中的PM 10水平为69±19微克/立方米，其主要受人员占用和活动的影响。强化清洁使所有教室中的PM 10水平显著下降（从79±22微克/立方米降至64±15微克/立方米）。通风对PM 10水平的影响并不一致——所有学校的CO₂水平都非常高，强化通风可使其降低（平均从1459 ppm降至1051 ppm）。
尽管需要进一步研究以了解PM 10的详细特征（粒径分布、化学特性），但这些数据足以改善学校的清洁和通风状况。
