Investigating Indoor Air Pollution Sources and Student’s Exposure Within School Classrooms: Using a Low-Cost Sensor and Source Apportionment Approach

IF 4.3 2区 环境科学与生态学 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Indoor air Pub Date : 2024-09-23 DOI:10.1155/2024/5544298
Owain G. Rose, Dimitrios Bousiotis, Catrin Rathbone, Francis D. Pope
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Abstract

Indoor air quality is becoming one of the most important factors for public health, as people tend to spend more time indoors, either at home or at work. This paper combines the use of calibrated low-cost particulate matter (PM) sensors with source apportionment algorithms to understand the factors that affect the indoor air quality within a typical UK school. Low-cost optical particle counter (OPC) sensors were placed in three different classrooms within the school, measuring PM concentrations during a typical school week and the subsequent holiday period, to understand the role of occupancy within schools for air quality. When students were in attendance during school hours (09:00–15:30), the classroom with the greatest average PM levels had PM2.5 and PM10 mass concentrations of 14.4 and 51.0 μg/m3, respectively. During school hours, when students were present, all classrooms had average PM2.5 concentrations greater than 8.1 μg m−3 and average PM10 concentrations greater than 13.1 μg m−3. Notably, the English studies classroom exceeded the 24-h WHO ambient PM10 guideline (45 μg m−3). Employing the non-negative matrix factorization (NMF) algorithm for source apportionment revealed that between 93% and 98% of PM1 observed within classrooms derived from outdoor sources. This contribution diminished as particle size increased, with outdoor sources accounting for 74%–89% of PM2.5, and 19%–40% of PM10, respectively. The differences in classroom PM concentration and source percentages are attributed to differences in lesson activities, lesson frequency, flooring (carpeted versus hard flooring), location within the school, and proximity to outdoor sources such as roads. The approach described within the paper is easily translated to other indoor locations and could also be straightforwardly scaled due to its relatively low cost. Thereby, it allows for air quality management in locations crucial for the public health and educational outcomes of children.

Abstract Image

调查学校教室内的室内空气污染来源和学生接触情况:使用低成本传感器和污染源分摊法
室内空气质量正成为影响公众健康的最重要因素之一,因为人们往往在家里或工作场所花费更多时间在室内。本文结合使用校准过的低成本颗粒物 (PM) 传感器和污染源分配算法,来了解影响英国一所典型学校室内空气质量的因素。低成本光学颗粒计数器 (OPC) 传感器被放置在学校内三个不同的教室中,在典型的学校周和随后的假期期间测量可吸入颗粒物浓度,以了解学校内的占用率对空气质量的影响。当学生在上课时间(9:00-15:30)上课时,PM2.5 和 PM10 平均浓度最高的教室的 PM2.5 和 PM10 质量浓度分别为 14.4 微克/立方米和 51.0 微克/立方米。在上课时间,当学生在场时,所有教室的 PM2.5 平均浓度都大于 8.1 μg m-3,PM10 平均浓度大于 13.1 μg m-3。值得注意的是,英国的研究教室超过了世界卫生组织的 24 小时环境 PM10 指导值(45 微克/立方米)。采用非负矩阵因式分解(NMF)算法进行源分配后发现,教室内观测到的PM1有93%到98%来自室外。随着颗粒尺寸的增大,这一比例逐渐减小,室外来源分别占PM2.5的74%-89%和PM10的19%-40%。教室中可吸入颗粒物浓度和来源百分比的差异可归因于课程活动、课程频率、地板(地毯地板与硬地板)、校内位置以及是否靠近道路等室外来源。本文所描述的方法很容易应用到其他室内场所,由于成本相对较低,也可以直接推广。因此,它可以在对公众健康和儿童教育成果至关重要的地点进行空气质量管理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Indoor air
Indoor air 环境科学-工程:环境
CiteScore
10.80
自引率
10.30%
发文量
175
审稿时长
3 months
期刊介绍: The quality of the environment within buildings is a topic of major importance for public health. Indoor Air provides a location for reporting original research results in the broad area defined by the indoor environment of non-industrial buildings. An international journal with multidisciplinary content, Indoor Air publishes papers reflecting the broad categories of interest in this field: health effects; thermal comfort; monitoring and modelling; source characterization; ventilation and other environmental control techniques. The research results present the basic information to allow designers, building owners, and operators to provide a healthy and comfortable environment for building occupants, as well as giving medical practitioners information on how to deal with illnesses related to the indoor environment.
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