Loss processes affecting submicrometer particles in a house heavily affected by road traffic emissions
Loss processes affecting submicrometer particles in a house heavily affected by road traffic emissions
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DOI：
10.1080/02786826.2017.1343453
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发表时间：
2017-07
影响因子：
5.2
通讯作者：
T. Vu;S. Zauli-Sajani;V. Poluzzi;J. Delgado-Saborit;R. Harrison
中科院分区：
文献类型：
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作者：
T. Vu;S. Zauli-Sajani;V. Poluzzi;J. Delgado-Saborit;R. Harrison
摘要 渗入室内环境的室外气溶胶比例在确定室外颗粒物对人体暴露的肺部颗粒物总剂量的贡献方面起着重要作用。本研究的目的是调查影响室外交通颗粒迁移到室内环境的物理过程。 2012 年 2 月至 4 月期间，通过快速移动粒度测定系统在靠近意大利博洛尼亚一条繁忙街道的一所房屋的室内和室外环境中测量了颗粒数量分布。亚微米颗粒数量浓度的室内与室外 (I/O) 比率显示出对颗粒尺寸和气象条件的强烈依赖性。使用动态质量平衡和凝结模型确定由于沉积、凝结和蒸发而导致的颗粒损失率。室内小颗粒（成核和艾特肯模式）的损失率高于大颗粒（累积模式）。凝结和蒸发过程对室内交通纳米粒子的损失做出了重大贡献，特别是在白天。将正矩阵分解应用于室内和室外颗粒尺寸分布表明，室内环境中交通产生的成核模式颗粒大量损失，其中蒸发起着主要作用。版权所有 © 2017 美国气溶胶研究协会
ABSTRACT The fraction of outdoor aerosol that penetrates into indoor environments plays an important role in determining the contribution of outdoor particles to the total lung dose of particles in human exposure. The objective of this study was to investigate the physical processes affecting migration of outdoor traffic particles into indoor environments. Particle number size distributions were measured by a fast mobility particle sizer system in both indoor and outdoor environments of a house located in close proximity to a busy street in Bologna (Italy) in the period February–April 2012. Indoor to outdoor (I/O) ratios for submicron particle number concentrations showed strong dependence on particle size and meteorological conditions. The loss rates of particles due to deposition, coagulation, and evaporation were determined using dynamic mass balance and coagulation models. Higher loss rates were found for small particles (nucleation and Aitken mode) indoors than for larger particles (accumulation mode). The coagulation and evaporation processes made a significant contribution to the loss of traffic nanoparticles indoors, especially during the day time. Application of positive matrix factorization to the indoor and outdoor particle size distributions showed a substantial loss of traffic-generated nucleation mode particles in the indoor environment, with evaporation playing a major role. Copyright © 2017 American Association for Aerosol Research