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Effects of air cleaners and school characteristics on classroom concentrations of participate matter in 34 elementary schools in Korea

机译：空气滤清器和学校特征对韩国34所小学教室课堂参与物质浓度的影响

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Exposure to particulate matter (PM) in school environments has been associated with respiratory illnesses among children. Although using air cleaners was reported to reduce PM exposure and improve residents' health in homes, their effects in classrooms are not well understood. We examined how the use of air cleaners in classrooms and school/classroom characteristics affect the levels of indoor PM. Our environmental study included 102 classrooms from 34 elementary schools located on the mainland peninsula and an island in Korea. Indoor and outdoor PM were monitored simultaneously with portable aerosol spectrometers, and indoor gravimetric PM levels were measured with low volume, size-selective samplers during the class hours. Correlations among PM measurements were computed and final multiple regression models for indoor PM were constructed with a model building procedure. Correlation between indoor and outdoor PM2.5 (PM < 2.5 mu m in aerodynamic diameter) was higher (r = 0.78, p < 0.01) than that of PM10 (PM < 10 mu m) (r = 0.49, p < 0.01). School location, classroom occupant density, and ambient PM levels significantly (p-values<0.05) affected classroom PM concentrations. The adjusted PM levels in classrooms using air cleaners were significantly (p-values<0.01) lower by approximately 35% than in classrooms not using them. However, air cleaners appeared to remove PM2.5 more effectively than PM10, perhaps because coarse particles settle more rapidly than fine particles on surfaces, or their resuspension and generation rate by occupants exceeds the removal rate by air cleaners. Our study suggests that routine cleaning to remove surface dust along with the use of air cleaners might be required to effectively reduce occupants' exposure in classrooms.
机译：在学校环境中接触颗粒物（PM）与儿童呼吸道疾病有关。尽管据报道使用空气滤清器可以减少PM暴露并改善居民在家中的健康状况，但人们对它们在教室中的作用还知之甚少。我们研究了教室和学校/教室的空气净化器的使用如何影响室内PM的水平。我们的环境研究包括位于大陆半岛和韩国一个岛屿上的34所小学的102个教室。使用便携式气溶胶光谱仪同时监测室内和室外PM，并在上课时间内使用小体积，大小选择的采样器测量室内重量PM。计算了PM测量之间的相关性，并使用模型构建程序构建了室内PM的最终多元回归模型。室内和室外PM2.5（空气动力学直径PM <2.5μm）之间的相关性（r = 0.78，p <0.01）高于PM10（PM <10μm）（r = 0.49，p <0.01）。学校的位置，教室的人员密度和环境PM水平显着（p值<0.05）影响了教室PM浓度。与不使用空气净化器的教室相比，使用空气净化器的教室中调整后的PM水平显着降低（p值<0.01）约35％。但是，空气净化器似乎比PM10更有效地去除PM2.5，这可能是因为粗颗粒在表面上的沉降比细颗粒更快，或者是由于乘客的重悬浮和产生速度超过了空气净化器的去除速度。我们的研究表明，可能需要进行常规清洁以去除表面灰尘，并使用空气滤清器，以有效减少人员在教室中的暴露。

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