Identification of Fine Dust in Schools through Comprehensive Chemical Characterization

IF 1.1 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES Asian Journal of Atmospheric Environment Pub Date : 2022-12-20 DOI:10.5572/ajae.2022.122

Jiyou Kwoun, Seokwon Kang, Tae Jung Lee, Young Min Jo

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Abstract

The chemical characteristics of particulate matters collected from 53 schools in 2019 through 2022 were closely investigated to determine the main sources of classroom PM_2.5. On average, indoor PM_2.5 measured during class hours distributed from 3.3 μg/m³ to 45.97 μg/m³, and it consisted of 45% of ions, 33% of carbons, 17% of metals and others. The average indoor-to-outdoor ratio (I/O) of PM_2.5 was 0.73. Values for I/O ranged from 0.6 to 0.91 for inorganic elements; 0.3 to 0.8 for ions; 0.50 to 2.69 for elemental carbons (EC), and 0.52 to 8.50 for organic carbons (OC). The linear correlation of indoor EC with concentrations of K⁺ and NO₃⁻ indicates that the contribution of combustion-related sources to classroom PM_2.5 is significant in roadside schools. The findings from this study should help establish construction guidelines for urban schools near high-traffic areas.

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通过综合化学特性鉴定学校中的微尘

对2019年至2022年从53所学校采集的颗粒物化学特征进行了仔细研究，以确定教室PM2.5的主要来源。平均而言，课间测得的室内PM2.5分布在3.3 μg/m3至45.97 μg/m3之间，由45%的离子、33%的碳化物、17%的金属和其他物质组成。PM2.5 的室内外比率（I/O）平均为 0.73。无机元素的 I/O 值为 0.6 至 0.91；离子为 0.3 至 0.8；元素碳（EC）为 0.50 至 2.69，有机碳（OC）为 0.52 至 8.50。室内 EC 与 K+ 和 NO3- 浓度的线性相关表明，在路边学校，与燃烧有关的污染源对教室 PM2.5 的影响很大。这项研究的结果应有助于为交通繁忙地区附近的城市学校制定建设指南。

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