Emissions of Volatile Methyl Siloxanes (VMS) from Vehicles

IF 7.3 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Environmental Science & Technology Letters Environ. Pub Date : 2026-08-11 Epub Date: 2026-07-11 DOI:10.1021/acs.estlett.6c00590

Yanfang Chen, Yuantao Wang, Siyao Yue, Michael Bauer, Damianos Pavlidis, Carolina Molina, Georgia A. Argyropoulou, Andreas Aktypis, Christos Kaltsonoudis, Philippe Wili, Pierre Comte, Danilo Engelmann, Athanasios Nenes, Christian George, Imad El Haddad, Jay G. Slowik, Spyros N. Pandis, Andre S. H. Prevot, David M. Bell

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引用次数: 0

Abstract

Volatile methyl siloxanes (VMS) are anthropogenic compounds widely used in personal care products and industrial applications and are frequently detected at elevated concentrations in urban air. However, their sources in urban areas remain poorly constrained. Here, we use chassis dynamometer experiments to quantify gas-phase VMS emissions from a range of on-road vehicles, including light-duty gasoline and diesel vehicles. Hexamethylcyclotrisiloxane (D₃) dominated the emitted VMS, over octamethylcyclotetrasiloxane (D₄), and decamethylcyclopentasiloxane (D₅). VMS emissions increased with driving speed and were substantially higher from gasoline than from diesel vehicles. Comparison with tunnel measurements showing elevated ambient VMS concentrations supports a significant contribution from traffic-related sources, including tailpipe and potentially nontailpipe emissions. These results identify vehicular emissions as a previously underrecognized source of VMS near highways, and provide new constraints for their atmospheric budget and source apportionment.

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车辆挥发性甲基硅氧烷（VMS）排放

挥发性甲基硅氧烷（VMS）是广泛用于个人护理产品和工业应用的人为化合物，在城市空气中经常检测到浓度升高。但是，城市地区的来源仍然缺乏限制。在这里，我们使用底盘测功仪实验来量化一系列道路车辆（包括轻型汽油和柴油车辆）的气相VMS排放。六甲基环三硅氧烷（D3）占主导地位，超过八甲基环四硅氧烷（D4）和十甲基环五硅氧烷（D5）。VMS排放量随着车速的增加而增加，汽油车的排放量远远高于柴油车。与隧道测量值的比较表明，环境VMS浓度升高支持交通相关源的显著贡献，包括尾气排放和潜在的非尾气排放。这些结果确定了车辆排放是以前未被充分认识的高速公路附近VMS的来源，并为其大气预算和来源分配提供了新的约束条件。

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

Environmental Science & Technology Letters Environ. ENGINEERING, ENVIRONMENTALENVIRONMENTAL SC-ENVIRONMENTAL SCIENCES

CiteScore

17.90

自引率

3.70%

发文量

163

期刊介绍： Environmental Science & Technology Letters serves as an international forum for brief communications on experimental or theoretical results of exceptional timeliness in all aspects of environmental science, both pure and applied. Published as soon as accepted, these communications are summarized in monthly issues. Additionally, the journal features short reviews on emerging topics in environmental science and technology.