佳木斯市学校教室PM2.5连续监测及学生暴露水平评价

  目的  了解学校室内PM_2.5污染状况和学生暴露水平，为学生健康防护提供基础数据。  方法  通过在线环境监测仪对佳木斯8所中小学16间自然通风教室的PM_2.5进行为期2个学期的连续监测，同时抓取室外PM_2.5数据进行对比研究，对学生在校期间暴露量进行评价。  结果  春、秋两学期教室内PM_2.5平均质量浓度分别为(26.93±24.7)和(31.85±30.37) μg/m3，教室内外PM_2.5 I/O值分别为0.92和0.95，存在强相关性。两学期所有教室的全天PM_2.5平均质量浓度为(28.93±26.85)μg/m3，略高于白天学生在校期间的(27.53±26.53)μg/m3，且工作日质量浓度高于周末。随着楼层升高，室内PM_2.5质量浓度逐渐下降。学生在校期间的累积暴露量，春季学期为28.48 μg /m3，秋季学期为31.87 μg /m3。  结论  教室内PM_2.5随时间、水平空间与垂直空间的变化会有所不同，且室内PM_2.5的污染程度极大依赖于室外污染源；春、秋两学期学生在校期间PM_2.5暴露量有所差异。

Continuous monitoring of fine particulate matter in school classrooms and assessment of students' exposure level

  Objective  To explore the status of PM_2.5 pollution in school classrooms and the student exposure level, and to provide basic data to safeguard the health of students.  Methods  This study continuously monitored the PM_2.5 levels of 16 naturally ventilated classrooms in eight primary and secondary schools in Jiamusi for one academic year using an online environmental monitoring instrument. At the same time, outdoor PM_2.5 data was captured for comparative research, and student exposure to PM_2.5 during school hours was evaluated.  Results  The average concentration of PM_2.5 in the classroom in the spring and autumn semesters was (26.93±24.7) and (31.85±30.37)μg/m3, respectively, and the indoor/outdoor ratio (I/O) was 0.92 and 0.95, respectively, which indicated a strong correlation between them. The daily average concentration of all classrooms during both semesters was (28.93±26.85)μg/m3, which was slightly higher than the average concentration of (27.53±26.53)μg/m3 during the daytime when students were in school. In addition, the concentration on workdays was higher than that observed on weekends, and this was termed the "weekend effect". The indoor PM_2.5 concentration was lower on higher floors. The comprehensive exposure concentration of students during school was 28.48 μg/m3 in spring semester and 31.87 μg/m3 in autumn semester.  Conclusion  PM_2.5 levels in the classrooms varied according to time, the horizontal space, and the vertical space, and the level of indoor PM_2.5 pollution largely depended on outdoor pollution sources. Differences in PM_2.5 exposure were observed between.