Determination of the deposition of urban submicron aerosols in the human respiratory tract considering hygroscopic growth

IF 4.2 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Atmospheric Environment Pub Date : 2025-05-13 DOI:10.1016/j.atmosenv.2025.121289

Aoyuan Yu , Jiayuan Lu , Xiaojing Shen , Xinyao Hu , Yangmei Zhang , Quan Liu , Hongfei Tong , Linlin Liang , Lei Liu , Qianli Ma , Lujie Han , Huizheng Che , Xiaoye Zhang , Junying Sun

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Abstract

Assessing particle exposure in the human respiratory tract (HRT) is critical for understanding its health risks. Hygroscopicity is a key characteristic that influences particle deposition by changing particle size in the human respiratory tract. In this study, the daily deposited particle doses and rates of submicron particles in different regions of the HRT, as well as the total HRT considering hygroscopic growth, were comprehensively evaluated using the Multiple-Path Particle Dosimetry model (MPPD) and size-resolved particle hygroscopicity measurements obtained with the Volatility Hygroscopicity Tandem Differential Mobility Analyzer (VH–TDMA) in urban Beijing. Taking particle hygroscopicity into account, the deposition fractions (DFs) of particles smaller than 300 nm were 25.4 % lower than those of dry particles, while the DFs of particles larger than 300 nm increased by 23.0 %. The results indicated that the daily deposited particle number dose (DPNd), mass dose (DPMd) and surface area dose (DPSd) were predominantly deposited in the pulmonary (P) region, accounting for 53 %, 47 %, and 54 % of total respiratory tract deposition, respectively. Ultrafine particles (UFPs; <100 nm) dominated the daily DPNd, accounting for 86.4 %, 94.4 %, and 76.8 % of the total DPNd during the whole sampling period, new particle formation (NPF) days, and pollution period, respectively. In contrast, accumulation mode particles were the primary contributors to both DPMd and DPSd. From the perspective of diurnal variation, the highest deposited particle number rate (DPNr) in the HRT occurred during the daytime and evening rush hours, with peak values observed at 10:00 and 18:00, reaching 3.5 × 10⁹ and 4.5 × 10⁹ particles h⁻¹, respectively. The peak times for the deposited particle mass rate (DPMr) and surface area rate (DPSr) varied across different periods.

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考虑吸湿性生长的城市亚微米气溶胶在人呼吸道沉积的测定

评估人体呼吸道（HRT）中的颗粒暴露对于了解其健康风险至关重要。吸湿性是通过改变人体呼吸道中的颗粒大小来影响颗粒沉积的关键特征。本研究利用多路径粒子剂量学模型（MPPD）和挥发性吸湿性串联差分迁移率分析仪（VH-TDMA）获得的颗粒吸湿性测量数据，综合评价了北京城市不同区域的亚微米粒子的日沉积剂量和速率，以及考虑吸湿性生长的总HRT。考虑颗粒吸湿性，小于300 nm的颗粒的沉积分数（DFs）比干燥颗粒低25.4%，大于300 nm的颗粒的沉积分数（DFs）增加23.0%。结果表明，日沉积颗粒数剂量（DPNd）、质量剂量（DPMd）和表面积剂量（DPSd）主要沉积在肺区，分别占呼吸道总沉积量的53%、47%和54%。超细颗粒；在整个采样期、新粒子形成（NPF）日和污染期，日均DPNd占比分别为86.4%、94.4%和76.8%。与此相反，累积模式粒子是DPMd和DPSd的主要贡献者。从日变化来看，HRT沉积粒子数率（DPNr）在白高峰和晚高峰时段最高，峰值分别出现在10:00和18:00，分别达到3.5 × 109和4.5 × 109粒子h−1。沉积颗粒质量率（DPMr）和表面积率（DPSr）的峰值时间在不同时期有所不同。

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

Atmospheric Environment 环境科学-环境科学

CiteScore

9.40

自引率

8.00%

发文量

458

审稿时长

53 days

期刊介绍： Atmospheric Environment has an open access mirror journal Atmospheric Environment: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Atmospheric Environment is the international journal for scientists in different disciplines related to atmospheric composition and its impacts. The journal publishes scientific articles with atmospheric relevance of emissions and depositions of gaseous and particulate compounds, chemical processes and physical effects in the atmosphere, as well as impacts of the changing atmospheric composition on human health, air quality, climate change, and ecosystems.