An experimental study on the characteristics of human respiratory aerosol emission in different activity intensity states

IF 7.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Building and Environment Pub Date : 2024-11-14 DOI:10.1016/j.buildenv.2024.112314

Qingyuan Han , Honghan Huang , Chunying Li , Haida Tang

{"title":"An experimental study on the characteristics of human respiratory aerosol emission in different activity intensity states","authors":"Qingyuan Han , Honghan Huang , Chunying Li , Haida Tang","doi":"10.1016/j.buildenv.2024.112314","DOIUrl":null,"url":null,"abstract":"<div><div>The COVID-19 pandemic has significantly affected global health and necessitated an enhanced grasp of respiratory infectious disease spread. This research experimentally measured the intensity of exhaled particles with a diameter ranging 0.3–25 μm, emitted by individuals engaging in various activity levels. A total of 58 subjects participated in the experiment, engaging in activities at intensities of 0 km/h, 3 km/h, 5 km/h, 7 km/h, and 10 km/h, respectively. The number of exhaled particles with a diameter of 0.3–0.5 μm accounted for 87% of the total, but their mass accounted for only 11%. Particles larger than 3 μm made up only 1% of the overall mass, while particles between 5 and 10 μm in diameter accounted for 45% of the total mass. The experimental results demonstrated that there was no statistically significant difference in the strength of particles produced by individuals based on gender or activity intensity. The maximum number of particles in the 0.3–0.5 μm range was observed at 7 km/h, reaching 5,226,550 part/min, while the minimum occurred at 3 km/h with 1,161,810 part/min. The differences in the intensity of particles released between individuals could reach two to three orders of magnitude. This study reveals the relationship between exhaled aerosol intensity and activity intensity. It aids public health professionals and engineers in assessing pathogenic aerosols, informing efficient ventilation design to reduce indoor transmission risks.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"267 ","pages":"Article 112314"},"PeriodicalIF":7.1000,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Building and Environment","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0360132324011569","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

The COVID-19 pandemic has significantly affected global health and necessitated an enhanced grasp of respiratory infectious disease spread. This research experimentally measured the intensity of exhaled particles with a diameter ranging 0.3–25 μm, emitted by individuals engaging in various activity levels. A total of 58 subjects participated in the experiment, engaging in activities at intensities of 0 km/h, 3 km/h, 5 km/h, 7 km/h, and 10 km/h, respectively. The number of exhaled particles with a diameter of 0.3–0.5 μm accounted for 87% of the total, but their mass accounted for only 11%. Particles larger than 3 μm made up only 1% of the overall mass, while particles between 5 and 10 μm in diameter accounted for 45% of the total mass. The experimental results demonstrated that there was no statistically significant difference in the strength of particles produced by individuals based on gender or activity intensity. The maximum number of particles in the 0.3–0.5 μm range was observed at 7 km/h, reaching 5,226,550 part/min, while the minimum occurred at 3 km/h with 1,161,810 part/min. The differences in the intensity of particles released between individuals could reach two to three orders of magnitude. This study reveals the relationship between exhaled aerosol intensity and activity intensity. It aids public health professionals and engineers in assessing pathogenic aerosols, informing efficient ventilation design to reduce indoor transmission risks.

查看原文本刊更多论文

不同活动强度状态下人体呼吸气溶胶排放特征的实验研究

COVID-19 大流行严重影响了全球健康，因此有必要加强对呼吸道传染病传播的掌握。这项研究通过实验测量了不同活动水平的人呼出的直径为 0.3-25 μm 的微粒的强度。共有 58 名受试者参加了实验，活动强度分别为 0 公里/小时、3 公里/小时、5 公里/小时、7 公里/小时和 10 公里/小时。呼出的颗粒中，直径为 0.3-0.5 μm 的颗粒占总数的 87%，但其质量仅占 11%。直径大于 3 微米的颗粒只占总质量的 1%，而直径在 5 至 10 微米之间的颗粒占总质量的 45%。实验结果表明，不同性别和活动强度的个体产生的颗粒强度没有明显的统计学差异。0.3-0.5 μm 范围内的颗粒数量在 7 km/h 时最多，达到 5 226 550 个/分钟，而在 3 km/h 时最少，为 1 161 810 个/分钟。不同个体释放的微粒强度差异可达两到三个数量级。这项研究揭示了呼出气溶胶强度与活动强度之间的关系。它有助于公共卫生专业人员和工程师评估致病气溶胶，为有效的通风设计提供信息，从而降低室内传播风险。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Building and Environment 工程技术-工程：环境

CiteScore

12.50

自引率

23.00%

发文量

1130

审稿时长

27 days

期刊介绍： Building and Environment, an international journal, is dedicated to publishing original research papers, comprehensive review articles, editorials, and short communications in the fields of building science, urban physics, and human interaction with the indoor and outdoor built environment. The journal emphasizes innovative technologies and knowledge verified through measurement and analysis. It covers environmental performance across various spatial scales, from cities and communities to buildings and systems, fostering collaborative, multi-disciplinary research with broader significance.